Numbers only textbox
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
char c = e.KeyChar;
//c == 8 is Backspace
//c == 32 is Space
//c == 13 is Carriage return (Enter)
// http://www.asciitable.com/ Tabel of ascii characters
if ((Char.IsDigit(c) || c == 8) || c == 32 || c == 13) return;
e.Handled = true; //
}
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