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Showing posts from January, 2013

C# Numeric Only TextBox

Once in a while you find yourself needing to stop certain keypresses in a C# desktop application.  I've found the best way is to handle this in the keypress event of a text box.  This is some very small code that shows how to only allow numeric digits to be pressed.

private void textBox_KeyPress( object sender, KeyPressEventArgs e ) {      e.Handled = !char.IsDigit( e.KeyChar ); }

Now if you want to allow other characters, like the decimal, etc you need to get a bit fancier.


private void textBox_KeyPress( object sender, KeyPressEventArgs e ) {        if( char.IsDigit( e.KeyChar ) ||            e.KeyChar == '.' )        {           e.Handled = false;       }       else       {           e.Handled = true;       } }
To allow more characters you just need to modify that first if parameter to your needs.