Only accepts numeric characters.

[Chubi]

I need to create one RadDropDownList control in which user can enter only digits but not characters.
Hope I Will get answer soon, Thanks

[Plamen]

Hello Chubi,

Thank you for writing.

You can achieve such behavior by using the TextChanging event of the inner text box. Here is a sample code:

this.radDropDownList1.DropDownListElement.EditableElement.TextBox.TextBoxItem.TextChanging += new Telerik.WinControls.TextChangingEventHandler(TextBoxItem_TextChanging);

void TextBoxItem_TextChanging(object sender, Telerik.WinControls.TextChangingEventArgs e)
{
    e.Cancel = e.NewValue.Any(character => !char.IsNumber(character));
}

Attached you can find a sample project, which demonstrates this functionality.

I hope this helps.

All the best,
Plamen
the Telerik team

[Chubi]

Mr. Plamen
Thank you for You reply.
And here I would like to get VB.net(2010) Code but not C# or other
Thanking you again for your valuable reply..

[Stefan]

Hi Chubi,

Here is the VB version of the code snippet:

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
       AddHandler RadTextBox1.TextBoxElement.TextBoxItem.TextChanging, AddressOf TextBoxItem_TextChanging
   End Sub

   Private Sub TextBoxItem_TextChanging(sender As Object, e As Telerik.WinControls.TextChangingEventArgs)
       e.Cancel = e.NewValue.Any(Function(character) Not Char.IsNumber(character))
   End Sub

In future, if you need such to convert code from C# to VB and vice versa, you can try our free online converter at: http://converter.telerik.com/.

I hope this helps.
 
Kind regards,
Stefan
the Telerik team

[Chubi]

Mr.Stefan
Thank you for You reply.
I Used your free tool 'telerik converter' to convert first code which you have given, but I am getting Error (It is not converted).
And about your reply, I need Codes for "RadDropDownList" not for "RadTextBox1" 

I have made one modification in your code as given below...

"AddHandler RadTextBox1.TextBoxElement.TextBoxItem.TextChanging, AddressOf TextBoxItem_TextChanging"

Changed To..

"AddHandler RadDropDownList1
.DropDownListElement.EditableElement.TextBox.TextBoxItem.TextChanging, AddressOf TextBoxItem_TextChanging"

its ok..
but getting error near code  "e.NewValue.Any"       (e.Cancel = e.NewValue.Any(Function(character) Not Char.IsNumber(character)))
VB Says " 'Any' is not a member of string. "

Pleas give your valuable reply.

[Stefan]

Hi Chubi,

Please excuse me for the confusion. The error you are getting is because you are using a .NET version prior .NET3.5. Here is the code for versions where lambdas are not supported:

Private Sub TextBoxItem_TextChanging(sender As Object, e As Telerik.WinControls.TextChangingEventArgs)
        'e.Cancel = e.NewValue.Any(Function(character) Not Char.IsNumber(character))
        e.Cancel = Not IsNumeric(e.NewValue)
    End Sub

I hope this helps.

All the best,
Stefan
the Telerik team

[Chubi]

Hello Stefan,

 I did as u said, but I can't enter the number except in the format given in code snippet ("0123456789"), I mean I Can enter only in ascending order not any other numbers(example: 1324, 156, 10). And I am using .net framework version 4
Hope I will get the Solution

[Stefan]

Hi Chubi,

Please excuse me for the misunderstanding. I have updated the code snippet in my previous post and it should be working correctly now.

As to the lambdas, I am not sure why it does not work in your case. The error you have provided is raised when the framework version is less than 3.5. With 3.5 and 4.0 I am able to use it. See attached video (opens in browser).

All the best,
Stefan
the Telerik team