DELETE ONE STRING FROM YOUR TEXTBOX (Work as Calculator's Textbox/Backspace)

//CLICK ON BUTTON1

 private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length > 1)
            {
                textBox1.Text = textBox1.Text.Substring(0, textBox1.Text.Length - 1);
            }![enter image description here][1]
            else
            {
                textBox1.Text = "0";
            }
        }