Tim,
I would probably use the KeyPressed event handler. Below is some code that would only accept numeric data (and the backspace)

private void txtNumeric_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
  if (!System.Char.IsNumber(e.KeyChar) && e.KeyChar != (char)System.Windows.Forms.Keys.Back)
  {
    e.Handled = true;
  }
}

I appologize that the code is C#, but it should be very easy to convert

Einar

>Is there an easy way to only allow the user to enter numeric data into a datagrid cell that is bound to a data table?