In a text box I want to allow only numbers and backspace.

Currently the code I have only allows numbers. How do I also allow backspace?

if (!Char.IsDigit(e.KeyChar))
{
e.Handled = true;
}

Put a breakpoint there and see what character code you get when you hit
backspace. It should be one of the control characters.

"Mike L" <(E-Mail Removed)> wrote in message
news:F5BFB140-0A1F-428A-8A0D-(E-Mail Removed)...
>
> In a text box I want to allow only numbers and backspace.
>
> Currently the code I have only allows numbers. How do I also allow
> backspace?
>
> if (!Char.IsDigit(e.KeyChar))
> {
> e.Handled = true;
> }
>

"Mike L" <(E-Mail Removed)> wrote in message
news:F5BFB140-0A1F-428A-8A0D-(E-Mail Removed)...
>
> In a text box I want to allow only numbers and backspace.
>
> Currently the code I have only allows numbers. How do I also allow
> backspace?
>
> if (!Char.IsDigit(e.KeyChar))
> {
> e.Handled = true;
> }
>

if (!Char.IsDigit(e.KeyChar) && e.KeyCode != Keys.Back) {
e.Handled = True;
}

HTH,
Mythran

Hi Mike,

I usually use Char.IsControl as this allows for cut and paste as well.

if (!Char.IsDigit(e.KeyChar) || !Char.IsControl(e.KeyChar))
e.Handled = true;


On Mon, 26 Sep 2005 23:33:03 +0200, Mike L <(E-Mail Removed)> wrote:

>
> In a text box I want to allow only numbers and backspace.
>
> Currently the code I have only allows numbers. How do I also allow backspace?
>
> if (!Char.IsDigit(e.KeyChar))
> {
> e.Handled = true;
> }
>
>



--
Happy coding!
Morten Wennevik [C# MVP]