Best way to allow only numbers on a textbox

[ThienZ]

i tried this :

oTB.KeyPress += new KeyPressEventHandler(TextBoxNumberOnly_KeyPress);

	private void TextBoxNumberOnly_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) 
	{
		if(!Char.IsNumber(e.KeyChar)) 
		{ e.Handled = true; }
	}

 

but this way i can't press backspace too.... the cursor arrow and delete buttons work tho... how should i do this a better way?

 

thx in advanced... :)

[AlexCode]

This will do:

 

http://www.codeproject.com/vb/net/Complete_Textbox.asp

 

Alex :p

[techmanbd]

this is how I do it, but in VB but maybe help you with your code because it is very similiar

 

  Private Sub txtCalledNumber_KeyPress(ByVal sender As System.Object, ByVal e As KeyPressEventArgs) Handles txtCalledNumber.KeyPress
       If Not Char.IsNumber(e.KeyChar) And Not Asc(e.KeyChar) = 8 Then
           e.Handled = True
       End If
   End Sub

 

This allows only numbers and the backspace

[PlausiblyDamp]

You probably also want to handle pasting of text into the control as well ;) an easy one to miss. Never underestimate the end user :)

[ThienZ]

thx guys :)

 

now the code looks like this :

	private void TextBoxNumberOnly_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) 
	{
		if(!Char.IsNumber(e.KeyChar) && !( ((int) System.Text.Encoding.ASCII.GetBytes(e.KeyChar.ToString())[0]) == 8))
		{ e.Handled = true; }
	}

 

the only problem is that this code is a little slow in the first usage of escape key (it thinks about a second), but after that you notice nothing else...

 

maybe any other suggestions to better the running time of the code?