How do I make a textbox that only accepts numbers?

Question

I have a windows forms app with a textbox control that I want to only accept integer values. In the past I\'ve done this kind of validation by overloading the KeyPress event

Answer 1

You can use the TextChanged event

private void textBox_BiggerThan_TextChanged(object sender, EventArgs e)
{
    long a;
    if (! long.TryParse(textBox_BiggerThan.Text, out a))
    {
        // If not int clear textbox text or Undo() last operation
        textBox_LessThan.Clear();
    }
}