How to Restrict Numeric Value in a TextBox

This article shows that when a user type a numeric value it will give an error...

//Type this code on the KeyPress event of the textbox

    private void textBox_KeyPress(object sender, KeyPressEventArgs e)

    {

        if (char.IsDigit(e.KeyChar) == true)

            MessageBox.Show("You can't type a numeric values");

    }