Code Policies - the first step to get rid of boring code policy violations is made.

As I and Vesko (only!) discussed - it is great to follow code policies, and they are saving time. A lot of time. I agree. I really like to have so strict policies at work so I can find for example the ObjectDataSource of some dropdown, without knowing its name. For example i will type "objDsSomething" or "odsSomething" or "ODSSomething". It really saves time. I don't really agree with Vesko's opinion that only in the begining you are violating the code policies. I think even developers who worked on the same project for year will violate its policies (not so often offcourse). The problem is that we are all human beings and we all make mistakes. I decided to do something to help myself get rid of at least the boring code policies - such

as naming conventions.
Here is what I have so far (I started this thing few days ago and I am working on it for about an hour daily after I was all day at work so it may not look very promising but I think it has potential):



When you click on "Validate Current Document" the document which is currently open will be validated against predefined naming conventions. If you violated something you will have this output:



I have few more problems to solve and will be really glad if someone can point me the direction:

1. I need to find a way to add this menu to the context menu for the document and also I would like to add hot key so you can for example validate the document by pression "CTRL + V + D" or something else (this is low priority).
2. I would also like to be able to check the code itself for inadequate assignments, method calls and so on. The CodeModel approach I think, will not allow me to do so.
3. I would like to change those standard icons with custom ;) (low priority).

Currently this thing can fly only for naming conventions.

C# standard way to check if a character is lower case

Okay, I am guilty ;). I found the "C# way", I forgot to check the char to see if it offers some static methods to check if a character is lower case. IT DOES :). I ovelooked it... Here is how will you check if a character is lower case in "C# style": char.IsLower(c); Furthermore the char type offers more useful methods as : .IsUpper(char c) ;). IsNumber, IsPunctuation and so on, so I will stick to it for now. Sorry for misleading you (if I did :)

.

Check if a character is lower case (C#)

I am not quite sure if there is a "standard" way to check if a character is lower case but here is what I came up with: private bool isLowerCase(char c) {   return c > ((int)'a') - 1 && c < ((int)'z') + 1; } I think another approach would be to check if the character against the lowercase version of the character but this way you will have to first convert it to string (as the char type doesn't support .ToLower()), then to get the element at index 0 (so you again have a char variable. Here is the method to do so: private bool isLowerCase(char c) { return c.ToString().ToLower()[0] == c; } the last approach is to check the character with regular expression: private bool isLowerCase(

style="color:Blue;">char c)
{
return Regex.IsMatch(c.ToString(), "[a-z]");
}

Note that I haven't tested those approaches, I only worked with the first one, the other were written just to point you other approaches. If you want to use some of them you will need first to test them (although I think they will also work like charm). The other think to consider is the performance, when I have some free time I may perform some tests to see which approach is the fastest.

C# SqlParameter strange behaviour (or not so strange?)

I had strange experience with the SqlCommand.AddWithValue method. Consider the following code: SqlCommand cmd = new SqlCommand(); cmd.CommandText = "SELECT * FROM Products WHERE ProductID=@ProductID "+ cmd.Parameters.AddWithValue("@ProductID", 12); Can you spot error? It is a developer error ;). The problem is the "+" after the command text line. What is strange is that it won't generate compiler error. Instead this, the text will become: "SELECT * FROM Products WHERE ProductID=@ProductID @ProductID" (the name of the variable added will be appended to the command text) Offcourse in the normal case you will not have + between the CommandText = and Parameters.AddWithValue, but if you accidently miss this tiny error

it will be pretty hard to spot it later (as the compiler will not complain).


Be careful ;)

Code policies?

I was thinking the other day about how much efforts does it take to strictly follow your company code policies. They are saving time for sure, but they are also wasting time. First of all the developer needs to think about the policies all the time. This districts him/her from the real problems. Second - after the task is completed the developer again needs to check if his / her code follows the code policies. Third - if there is a code review - the code reviewer will also need to check if there isn't a problem with those code policies, class by class, member by member. Some of the rules are very very foundamental as for example not to reference the DataAccess Layer from the User Interface Layer. Other are company level rules - such as

naming conventions, using some classes on some places and not using some classes on some places. Also - using your project util classes instead implementing the same functionality in your class.

While some of the things aren't very easy to note in a code, other are obvious. And while some of the things aren't very easy to automate via AddIn or external program, other can be easilly automated.

In my opinion the developer should be focussed develop some more useful functionality, instead thinking about which rule will he / she broke.
Please note that by writing the above sentence I am not saying - "Drop the code policies!", but "Automate the code policies!". If I had some tool to check if I violate a rule while writing code, I will rewrite my code in order to satisfy this rule. But after I don't have I need to think about those rules while developing, which districts me from what I need to achieve.

I would really appreciate if you drop a comment on the following question(s):

"Does the code policy bother you? Does it take from your time? Does it districts you?"

Thanks in advance!

C# Microsoft Excel Automation - very simple Microsoft Excel AddIn to get Amazon deals

First of all here is how will it look: This is a Microsoft Excel 2003 Addin Project (under File -> New -> Project expand C# -> Office and you should see it). Here is the code for the addin connection : XmlDocument doc = new XmlDocument(); // Link to the Amazon feed. doc.Load("http://rssfeeds.s3.amazonaws.com/goldbox"); XmlNodeList xmlNodeItems = doc.DocumentElement.SelectNodes("/rss/channel/item"); Excel.Worksheet sheet = (Excel.Worksheet)Application.ActiveSheet; int i = 0; // Start reading each item in the rss feed. foreach (XmlNode

xmlNodeItem in xmlNodeItems)
{
i++;
if (i > 10) break;
// Get title, link and description, the
// description will be later used to retrieve image url.
string strTitle = xmlNodeItem.SelectSingleNode("title").InnerText;
string strLink = xmlNodeItem.SelectSingleNode("link").InnerText;
string strDescription = xmlNodeItem.SelectSingleNode("description").InnerText;

// Get the cell in which we will write the title of the product.
Excel.Range rngTitle = ((Excel.Worksheet)Application.ActiveSheet).get_Range("A" + i.ToString(), "A" + i.ToString());

// Some variables for the picture creation:

float picLeft = 50;
float picTop = float.Parse(rngTitle.Top.ToString()) + 5f;
float picWidth = 50;
float picHeight = 50;
string strImageFile = GetImageUrl(strDescription);


// Make fonts bold and write the text in the first cell ("A").
rngTitle.Font.Bold = true;
rngTitle.Value2 = strTitle;

// Add the picture
Excel.Shape pic = ((Excel.Worksheet)Application.ActiveSheet).Shapes.AddPicture(strImageFile, Microsoft.Office.Core.MsoTriState.msoCTrue, Microsoft.Office.Core.MsoTriState.msoCTrue, picLeft, picTop, picWidth, picHeight);

// Make the title centered both horizontally and vertically.

rngTitle.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;
rngTitle.VerticalAlignment = Excel.XlVAlign.xlVAlignCenter;

// Make the picture move if neighbour cell is resized.
pic.Placement = Microsoft.Office.Interop.Excel.XlPlacement.xlMove;
}

Note : I removed the VSTO generated code region so I don't waste space. You shouldn't do this ;).

In other words if you copy the code you will need to paste it below the VSTO generated code region.

I also used a subroutine to extract the image url from the description, it is very simple, greedy regular expression:

     private string GetImageUrl(string strDescription)
     {
        Match mImage = Regex.Match(strDescription, "src=\".+?\"");
        return mImage.Value.Replace("src=", "").Replace("\"", "");
     }


Things to do:

1. First of all there is no good way to resize a cell in Excel. Your user will be presented very ugly screen. Here is how it actually looks if you don't resize the cells:




Very ugly huh?

2. The other think that bothers me is that Amazon lists about 100 products in their deals feed. So it is a bit slowly to get all the images (they are downloaded on the fly).

I will be very happy to discuss this problem with any of you.

Cheers ;).

3 ways to get true / false as string in C#

Who needs that much? Well, it's good to choose one and keep up with it. The first, oldfashioned way is to write the bool as string: string trueStr = "True"; But how would you know if the first letter should be uppercased? There are two better ways to get the True string or False string: string trueStr = true.ToString(); string trueStr = false.ToString() And the last method is to use the bool type : string trueStr = bool.TrueString; string trueStr = bool.FalseString; I think it is best to use the last one as it seems to me it was added exactly for such purposes.

>

button click and onclientclick event execution order

I was looking at the Google analytics service I have installed on this blog, there is a section in which you can find top search queries which users used to reach my blog. And the title of this post appeared in the results. I decided to post a short answer to this question. The answer is that button click executes first on the client side and then, if the execution returns true or void - a post back is invoked using __doPostBack with a parameters to let the server know it needs to invoke the button OnClick event handler. Prior the OnClick handler is invoked, the server will invoke the OnLoad event handler for the page, setting Page.IsPostBack to true.

>

C# filtering List of abstract objects to a List of concrete objects (is vs. as vs. OfType + ToList()).

In many cases we may want to extract a list of concrete object types from a list with more abstract types. For example if we have a List of users, we may want to extract another list of users which are administrators (let’s suppose administrator inherits user). I did some very basic tests to check which approach will be faster to achieve this (by faster I mean optimized, not faster to write). I used a List

element to nullable int (int?) (using “as” operator) and see if it is null.
Candidate 2 : Iterate the collection with foreach, get each element as object and check it with “is” operator against int type.
Candiate 3 : Use OfType with ToList, which is only one line of code.

Let’s see the classes (I did a separate class for each approach)

class ISSample
{
public static void StartSample(List<object> objects)
    {
        int processed = 0;
        List<int> intList = new List<int>();
        long ticksStart = DateTime.Now.Ticks;
        foreach (object obj in objects)
        {
           processed++;
           if (obj is int)
           {
             intList.Add((int)obj);
           }
        }
     long ticksEnd = DateTime.Now.Ticks;
double result = Convert.ToDouble(ticksEnd - ticksStart) / TimeSpan.TicksPerSecond;
        Console.WriteLine("IS executed for : " + result.ToString("N10")
+" seconds, items processed: " + processed);
}
}

class ASOperatorSample
{
public static void StartSample(List<object> objects)
    {
     int processed = 0;
        List<int> intList = new List<int>();
        long ticksStart = DateTime.Now.Ticks;

        foreach (object obj in objects)
        {
           processed++;
           int? obj2 = obj as int?;
           if (obj2 != null)
           {
             intList.Add((int)obj2);
           }
        }

        long ticksEnd = DateTime.Now.Ticks;
double result = Convert.ToDouble(ticksEnd - ticksStart) / TimeSpan.TicksPerSecond;
Console.WriteLine("AS executed for : " + result.ToString("N10") + " seconds items processed: " + processed.ToString());
     }
   }

class OfTypeSample
{
public static void StartSample(List<object> objects)
    {
     List<int> intList = new List<int>();
        long ticksStart = DateTime.Now.Ticks;

        // Here is how this is done in C# 3.5 style
        // with one line only
        intList = objects.OfType<int>().ToList<int>();
        
        long ticksEnd = DateTime.Now.Ticks;
        double result = Convert.ToDouble(ticksEnd - ticksStart) / TimeSpan.TicksPerSecond;
        Console.WriteLine("OfType executed for : " + result.ToString("N10") + " seconds.");
}
}


Now let’s see some outputs:

AS executed for : 5.3281250000 seconds items processed: 10000000
IS executed for : 0.3750000000 seconds, items processed: 10000000
OfType executed for : 0.7812500000 seconds.
Press any key to continue . . .

AS executed for : 5.6562500000 seconds items processed: 10000000
OfType executed for : 0.7812500000 seconds.
IS executed for : 0.5312500000 seconds, items processed: 10000000
Press any key to continue . . .

OfType executed for : 0.9375000000 seconds.
AS executed for : 5.5468750000 seconds items processed: 10000000
IS executed for : 0.3906250000 seconds, items processed: 10000000
Press any key to continue . . .

As you can see there is slight difference in the results depending on which approach will we call first. The obvious thing is that Is operator is always faster, followed by the OfType and the last place is for AS operator.

You may note that for the “is” and “as” operators I added “items processed:” portion. This is very important - by using foreach you can do some statistics inside the loop, while using OfType won’t let you write any code inside the loop.

C# var - the difference between invariant type (JavaScript and other languages) and C#

The var keyword in C# (which is not even a keyword as you are permitted to create a class "var") is different from javascript. The difference is that once assigned, a variable pefixed with a var "keyword" will have the type of what was assigned and will only allow you to assign object of the same type to this variable (or objects which inherit from that object). Here is a brief example: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.SqlClient; namespace LINQ {    class Program    {      static void Main(string[] args)      {         Sample();      }      static void Sample()      {

style="color:Blue;">var a = new object();
        a = new OperationCanceledException();
        Console.WriteLine(a.GetType().Name);
     }
   }
}

Note, that we first assign new object to the variable a. After this assignment, "a" will only accept variables of type object (or any other type, which inherits from object). Then we assigned OperationCanceledExceptionObject (which inherits object type through Exception). If you try the opposite - to first assign OperationCanceledException variable and then object you will end up with exception.


Conclusion: with var you are forcing the compiler to infer the type of the right side variable automatically. You will not need to declare what the type of variable should be. This saves you the following:

object a = new object();

What's nice is that Microsoft Visual Studio 2008 will be able to determine the type of a also and offer you intelisense.

How to catch specific MSSQL exception in .NET?

This one is pretty interesting. Not quite sure how useful, but it is good to know it. For the following example you will need one SQL table. I have a table called products. It has a column ProductName (NVARCHAR(10)), which we will use so I can show you how to catch specific SqlException and pass over all other SqlExceptions (actually re-throw them). As you may or may not know the Sql namespace has one exception which is generic and is thrown no matter what caused the exception inside the SqlServer, .NET will always throw SqlException. So how can we distinct the different Sql Errors? Let’s make a short demo so I can show you. First of all, as I said, we will have a table (in my case Products). The ProductName column is set to be

unique, so if a product with the same name already exist in .NET we will have SqlException, but in Sql the things are different. There we will have something like:



Msg 2627, Level 14, State 1, Line 1

Violation of UNIQUE KEY constraint 'p'. Cannot insert duplicate key in object 'dbo.products'.



Let’s say we want to catch only the “Unique violation” exception and leave all other exceptions propagate.



Let’s setup a very small form to illustrate this. We will have two labels, one text box and one button. When clicking on the button the text in the text box will be added in the Products table. If there is already product with the same name we will display the second label.

Simple isn’t it?



Here is the form:



<asp:Label ID="lblProductNameCaption" runat="server" Text="Product name:" />

<br />

<asp:TextBox ID="txtProductName"

         runat="server"

Width="259px">

asp:TextBox>

<br />

<asp:Label ID="lblError"

runat="server"

        Visible="false"

        ForeColor="red"

        Font-Size="x-small">

asp:Label>

<br />

<asp:Button ID="btnSaveProduct"

        runat="server"

        OnClick="btnSaveProduct_Click"

        Text="Save"

Width="79px" />



In order to distinct the unique constraint violation we need to compare it to something. Fortunately SqlException type transports the ErrorNumber from the SqlServer straight to .NET, so we can use it.

We need to find out the number for that particular exception. In a previous post I wrote where can you obtain information about all errors in Sql Server.

Okay, we know the error number of Unique Constraint Violation.

Let’s write some code to handle it:



const int uniqueConstraintViolaton = 2627;



This constant you may define as global so you can access it across your code.



The magic comes in the btnSaveProduct_Click:



SqlConnection con = new SqlConnection("connection_string");

con.Open();

SqlCommand cmd = con.CreateCommand();

cmd.CommandText = "Insert into products " +

"(productname)" +

             "values " +

             "('" + txtProductName.Text + "');";

try

{

cmd.ExecuteScalar();

}

catch (SqlException sqlException)

{

if (sqlException.Number == uniqueConstraintViolaton)

    {

     this.lblError.Text = "Product already exist.";

        this.lblError.Visible = true;

     }

     else

     {

     // Pass over ...

        throw sqlException;

     }

}



What we did? We caught SqlException in the catch block.

We tested if it is the Sql error we are expecting. If it was - we performed some actions to inform the user.

If it wasn’t - we re-thrown, so if there is some exception handling code - it could receive it and handle it as expected.



When you type in a name of a product which already exist in the database you should see the label showing, informing you that there is a product with that name.

To test if other exceptions are propagating, you may type a name with more than 10 symbols (I set my ProductName column to be NVARCHAR(10)). You should see exception which informs you that the data would be truncated. Your code will not handle this, but pass it over.



Literature which may be useful: Microsoft SQL Server 2005 Unleashed, Microsoft SQL Server 2005 For Dummies, Pro ADO.NET 2.0, Programming Microsoft® ADO.NET 2.0 Core Reference

How to get all Microsoft SQL Server errors

This can be achieved by using the sys.sysmessages system view. You may want to specify language to prevent errors localized in all available languages to be returned. English should be with 1033 id. Here is a query which will return all the errors for English: select * from sys.sysmessages where msglangid=1033 Literature which may be useful: Microsoft SQL Server 2005 Unleashed, Microsoft SQL Server 2005 For Dummies

>

Enumerators - the correct way to parse an enumerator.

First of all - what are enumerators? You can think for the enumerators as for some kind of constants. They are used to check objects against. Let's say you will have the following dropdown: <asp:DropDownList ID="ddlGender" runat="server"> <asp:ListItem Value="1">Maleasp:ListItem> <asp:ListItem Value="2">Femaleasp:ListItem> <asp:ListItem Value="3">Won't shareasp:ListItem> asp:DropDownList> As you know the genders won't ever change, for code convenience, you may want to define an enumerator to hold them, so you can check against: enum EnumUserGender { Male = 1, Female = 2, Unknown

= 3

}



This way, the Male element of the enumerator will have a value of 1, Female will have a value of 2 and Unknown will have a value of 3.

To check a value against enumerator you may do the following:



int Gender = 1;

if (Gender == EnumUserGender.Male)

{



}



In this case the if will evaluate to true, as the Gender variable has a value of 1.



Now, let's return to our case with the asp:DropDownList, we want to be able to know which asp:ListItem was selected by the user. We don't want to convert the value to int first, but to receive it as a EnumUserGender variable. Let's do this in the SelectedIndex SelectedIndexChanged asp:DropDownList:



protected void ddlGender_SelectedIndexChanged(object sender, EventArgs e)

{

EnumUserGender genderSelected = (EnumUserGender)Enum.Parse(typeof(EnumUserGender), ddlGender.SelectedValue, true);

switch (genderSelected)

{

case EnumUserGender.Male:

Response.Write("Check our cars section!");

break;

case EnumUserGender.Female:

Response.Write("Check our make-up section");

break;

case EnumUserGender.Unknown:

Response.Write("If you want you can check either our cars section or our make-up section");

break;

default:

Response.Write("Sorry, there was an" +

"error, please go back and try again," +

" the error was logged and will be reviewed by our team.");

break;

}

}

}



What we did was to actually Parse the Enum , by using its base class method Parse. It recieves 2 parameters + 1 optional:



Parameter 1 is of type Type, this is the type to which the enumerator will be parsed / converted. In our case we use the typeof, function, passing our enum type as a paramter.

Parameter 2 is of type string, this is the value to be parsed.

Parameter 3 is of type bool, and indicates whether the value passed as a string should match case sensitive. If set to true, you will have insensitive Parse, so "mALe" will be parsed correctly.

Changing asp:RequiredFieldValidator (why not any validator) in existing projects relatively easy

The last post I posted was about changing the asterix of asp:RequiredFieldValidator (I don’t see a reason this not to work for any validator). My friends Georgi and Vesko noticed that I am not thinking about how can we apply such a change in a big project. They also provided me with a solution to this problem. The solution is pretty good; it uses the control adapters approach to change the span which is rendered as output. But I found another way, I consider more elegant. Instead using the control adapter approach, you can simply repeat the following steps: 1. Right click on your project and choose Add -> ASP.NET Folder -> Theme 2. Name your theme folder “Default” for example. 3. Right click your theme folder and choose Add -> New Item

…
4. From the Add New Item dialog choose “Skin File”, name it “Default.Skin” and clik OK
5. Open “Default.Skin” file and add the following code


<asp:RequiredFieldValidator runat="server">
   <img src="~/images/validator.png" width="15" height="15"/>
asp:RequiredFieldValidator>

This will register the default behavior for asp:RequiredFieldValidator controls on your site.

6. Add the above code for all validators you want to affect.
7. Open your web.config file and find the section
8. Register the theme you just created like this :

<pages theme="Default">

So it can propagate throughout all of your pages.

Add as much as validators you want on ANY page of your site. The web.config declaration should take care to apply your generic skin to all validators on your pages.

Please note - if you have explicitly defined Theme for a page - the web.config declaration will be overridden, in such case - you may want to move you control declarations from the skin in the Default theme to a skin in the theme which is set for a page you want this changes to take effect.

Good Luck!

asp:RequiredFieldValidator (or any asp validator perhaps?) control with image instead asterix

I was wondering how can I create required field validator with image, instead this ugly asterix, used in most forms. The answer was pretty obvious but I couldn't see it for quite a long time. I even decided to write my own validator to inherit from RequiredFieldValidator and hopefully overwite the HtmlTextWriter thing in order to achieve this functionality. The solution is pretty strightforward, you don't need new controls, you don't need anything, all you need is : <asp:TextBox ID="txtFakeTextBox" runat="server">asp:TextBox> <asp:RequiredFieldValidator ID="rfFake" runat="server" ControlToValidate="txtFakeTextBox" Display="Dynamic" EnableClientScript="true">

/><asp:Image ID="imgTest" runat="server" ImageUrl="~/images/error.png"/>

asp:RequiredFieldValidator>

<br />

<asp:Button ID="btnOpenFakeValidator" runat="server" Text="Validate!" CausesValidation="true" />





What you do is to place and control between the opening and closing tags of the asp:RequiredFieldValidator. Pretty easy, huh?

Cancel post back based on user confirmation

Okay, in my first post in the ASP.NET rookies I said I will explain how you can have a button which will first ask you if you are sure you want to do particullar action.

I did the example with a simple button, not with GridView as it does'n matter, the logic is the same. First of all let's create new Web Application. My application name is "ASPNETRookies" as I plan to use this project not only for this demo but in the future for other demos.

Open the Default.aspx page in Visual Studio 2005 designer and place a button on the form:

<asp:Button ID="btnConfirmation" runat="server" Text="Chameleon Bulgaria"/>

I used "btnConfirmation” for ID and "Chameleon Bulgaria" to be shown as caption. If you have a grid for example, you will have some functionality to delete the user for which the button is pressed and probably to repopulate this grid with the users left in the database. To keep it simple I added very basic functionality to this button - our button will simply redirect to a site. So if the user confirms the dialog - he will be redirected to the site, if not - the post back should be cancelled and he should stay on the same page. To add the redirection part do the following:

Double click the button in designer view so Visual Studio can generate onclick handler (remember that this is the code behind onclick event handler. The code in it will be executed on the server, not on the client machine, so you should see that the page does post back).
Here is what I wrote in my onclick event handler:

     protected void btnConfirmation_Click(object sender, EventArgs e)
     {
        Response.Redirect("http://chameleonbulgaria.com");
     }


Now let's see how can we implement the rest of the logic - to have a confirmation box which asks the user something. The javascript function which asks the user a question and returns true or false according to his answer is Confirm('Text'). This will open a confirmation box with two buttons - OK and Cancel. If the user choose "OK" the Confirm function will return true, otherwise - it will return false. Okay, we know what we need, but where to place this code?

Well there are few ways to assign client click handler on ASP.NET button - all of them however, rely on the "OnClientClick" property. It receives the javascript which will be executed as a string. You can assign the name of a javascript function, or, alternativelly - the javascript code (only short code, please!). You can assign this property through the ASP.NET markup of the button (in the Default.aspx page) or you can assign it in the code behind (Page_Load handler for example). Okay, if you add it now as I did, you will have something like this:

     <asp:Button ID="btnConfirmation"
             runat="server"
             Text="Chameleon Bulgaria"
             OnClick="btnConfirmation_Click"
             OnClientClick="confirm('Do you want to go to Chameleon Bulgaria?');" />

Now run the project and click on the button. You will see the confirmation box. If you click on the "Cancel" button you should stay on the same page, but wait ..., what is going on? The button click event is raised again. This means we failed to complete our mission.
Now let’s think a bit. We see the confirmation box before the page is posted back to the server. So all we need to do is to somehow cancel the post back. Typically the button is rendered as submit html element. So what it does is to call our form .submit() method. Okay how can we cancel submit? By adding “return false” is the answer. When the browser see “return false” it will stop the execution of the javascript statement. Try this with our button. Add “return false” to the OnClientClick, removing our confirm for a while.

Okay we understood that we need to cancel the submission of the form, we understood how we can do this. Now let’s put all things together - we have a confirm() which returns true or false based on which button the user clicked. So in order to achieve the right functionality we need to add “return” before our confirm method like this:


OnClientClick="return confirm('Do you want to go to Chameleon Bulgaria?');" />


Try to run the project now. It should work just as expected. When you click “Cancel” the page won’t be sent back to the server.

ASP.NET Newbies

Hi to all my readers! I haven't been blogging for some time but I was extremely busy those days. A lot of things happened - I am leaving my work, I am starting new one, some offers which I couldn't accept and so on, I hope all the things that recently happened are for good (actually I am sure). I am posting now to let you know that I will try to organize my time in such a manner so I can have enough of it to deal with something I promised to few friends of mine. The promise was to start writing posts to help them get better in web development. They are starters yet and have read the books they need to read but we need to figure out how can they learn things that can't be learnt from the books. They need some practical examples and this

is what I will try to do.

I decided to start something like a Tips & Tricks section so those of my friends which alread read one of the ASP.NET books can benefit from those posts.

I think the most difficult thing for a newbie is to connect the dots. They have read for MSSQL, for C#, for ADO.NET, DataSets, C#, XML, Web Services, AJAX, wooow isn't this too much?
Typically when a newbie read a book - the book contains some practical examples and projects. And typically those projects are not so user friendly, I don't think there are projects in a book to utilize the client scripting for example.
If you are ASP.NET rookie can you answer the following question:

"You have a button which needs to do something in the code behind, but before it does this it should ask the user if he / she is sure he wants this thing done. For example you have a grid with clients. The grid also contains a column with buttons to delete client. When the user clicks on a delete button for a client, a confirmation box should popup asking him is if he / she is sure the client should be deleted. This thing should happen without post back to save users time."

I think most of you will not be able to answer this question as it is not quite popular ASP.NET books to contain also JavaScript lessons.
This is what I will try to do - to learn you (from what I know offcourse) how to tie different technologies to achieve the best user experience.

Never tought I will need Award Images module on my site ...

I recently built a PAD generator script on my site in order to easilly promote my software, but I never tought my software will be awarded. The surprise came from Sedo Auctions Watcher, it was awarded 5 stars by redsofts.com (you can find my program listed here). Becouse I built this little tool for few hours and it wasn't doing anything than informing you on ending domain auctions I was pretty surprised. What's even more interesting is that Sedo Auctions Watcher is adware program. It displays banners, but it does this by following some guidelines. It will not change your homepage or install toolbars. Probably because I was trying to play fear I was awarded. What's good is that this award changed the way I think. After 4-5 hours of work

were awarded, what will happen if I spend some more time?

You'll see soon ;)

You can find the rating guidelines here:

http://www.redsofts.com/awards.html

Finally its here ...

Skype passport 1.0 is out, you can find the simple html page on Chameleon Bulgaria Online demo: Here Download page: Here

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World's first Skype Passport is almost out ;)

This is a little javascript which will allow your users to easilly register on your site, by filling their contacts automatically from skype (offcourse only few fields are populated, but most registrations require only few fields after all). Here is a screenshot of this neat little javascript placed on a page: Note : This works only if your users are using IE (as this thing depends on ActiveX). The tool will be available for free download at my site : ChameleonBulgaria so visit it regularly ;) When I publish it, I will also publish a news on the frontend so you can know. Just a few more hours ;)

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