private void result_Click(object sender, EventArgs e) { double firstnumber = Convert.ToDouble(txtFirst.Text); double secondnumber = Convert.ToDouble(txtSecond.Text); if (rdbAddition.Checked == false && rdbSubtraction.Checked == false && rdbMultiplication.Checked == false && rdbDivision.Checked == false) MessageBox.Show("Please Select Operation Before Calculator", "Message Error", MessageBoxButtons.OKCancel, MessageBoxIcon.Error); if (rdbAddition.Checked) { txtAnswer.Text = Convert.ToString(firstnumber + secondnumber); } else if (rdbSubtraction.Checked) { txtAnswer.Text = Convert.ToString(firstnumber - secondnumber); } else if (rdbMultiplication.Checked) { txtAnswer.Text = Convert.ToString(firstnumber * secondnumber); } else if (rdbDivision.Checked) { txtAnswer.Text = Convert.ToString(firstnumber / secondnumber); }
firstnumber
secondnumber
TextBox
RadioButton
var
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