C#: Number Validation For DataGridView

private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (e.Control is TextBox)
{
TextBox tb = e.Control as TextBox;
tb.KeyPress += new KeyPressEventHandler(tb_KeyPress);
}
}

void tb_KeyPress(object sender, KeyPressEventArgs e)
{
if (!(char.IsDigit(e.KeyChar)))
{
if (e.KeyChar != '\b')  // allow the backspace key
{
e.Handled = true;
}
}
}