How to not display key in textbox

Question

I'd like to know how to solve my little problem. Im making calc with C# and have problem there:

if (e.KeyCode == Keys.Add)
        {
            textBox1.Clear();
            IfNumbersExist();
            SelectedOperation = Operation.Add;
            IsSecondNumberBeingEntered = true;
        }

So the problem is that when I'm pressing Add key textBox data is clearing, but '+' is still there. How to clear whole textBox to not display '+' too ?

Thanks

Answer 1

在黑暗中拍摄一些东西，但尝试将其添加到if语句中的某个位置：

e.Handled = true;