private void ResTxt2_KeyPress(object sender, KeyPressEventArgs e) { resultLbl.Text = null; if (e.KeyChar == (char)13 && ResTxt1.Text != null) { if (GetResult(ResTxt1.Text, ResTxt2.Text, ResTxt3.Text, ResTxt4.Text)) { RightFun(); } else { ErrorFun(); } } else if (e.KeyChar < 48 || e.KeyChar > 57) { e.KeyChar = (char)0; resultLbl.Text = "введите цифру"; ResTxt2.Focus(); } else if (e.KeyChar > 47 && e.KeyChar < 58) { ResTxt3.Focus(); } }
private void ResTxt1_KeyPress(object sender, KeyPressEventArgs e) { resultLbl.Text = null; if ((e.KeyChar > 47 && e.KeyChar < 58) && num11.Text != null) { ResTxt2.Focus(); } else if (e.KeyChar < 48 || e.KeyChar > 57) { e.KeyChar = (char)0; resultLbl.Text = "введите цифру"; ResTxt1.Focus(); } }