public void Button1_Click(System.Object sender, System.EventArgs e) { int n1 = default(int); int n2 = default(int); int i = default(int); n1 = (int) (Conversion.Val(TextBox1.Text)); n2 = (int) (Conversion.Val(TextBox2.Text)); for (i = 1; i <= n2; i++) { int a = default(int); a = n1 * i; TextBox3.Text = TextBox3.Text + n1.ToString() + " * " + i.ToString() + " = " + a.ToString(); TextBox3.Text = TextBox3.Text + "\r\n"; } }