TextBox enable to add only numbers - C#

Question

I have read a lot of code examples in this subject but it doesnt work. It should be no problem but it failed in my project where in other people project it work. I have text box in C# that should be contains only numbers. In my project if i have a text box with text :

-----------------------
|         32          |
|                     |
----------------------|

and i add a char " T" my resualt is :

-----------------------
|         T3          |
|                     |
----------------------|

It remove the first char instead the last char My code :

private void txt_NumOfIkun_KeyPress(object sender, KeyPressEventArgs e)
    {
        char charAdded = e.KeyChar;

        if (txt_NumOfIkun.TextLength > 1)
                txt_NumOfIkun.Text = txt_NumOfIkun.Text.Substring(0, txt_NumOfIkun.TextLength - 1);
            else
                txt_NumOfIkun.Text= "";
    }

why not use a NumericUpDown instead? – Selman Genç Oct 03 '14 at 09:07 — Selman Genç, Oct 03 '14 at 09:07

score 0 · Accepted Answer · answered Oct 03 '14 at 09:10

0

if (e.KeyChar < '0' || e.KeyChar > '9')
{
     e.Handled = true;
}

answered Oct 03 '14 at 09:10

craig1231

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thanks it works. but, how i do that i can delet number? because only the number in the keyboard works. – Ben Tubul Oct 03 '14 at 09:18
I got it. http://stackoverflow.com/questions/463299/how-do-i-make-a-textbox-that-only-accepts-numbers – Ben Tubul Oct 03 '14 at 09:23

TextBox enable to add only numbers - C#

1 Answers1