c# radiobutton

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;

 namespace MathsOperators
 {
     /// <summary>
     /// Interaction logic for MainWindow.xaml
     /// </summary>

     public partial class MainWindow : Window
     {

         public MainWindow()
         {
             InitializeComponent();
         }

         private void calculateClick(object sender, RoutedEventArgs e)
         {
             try
             {
                 if ((bool)addition.IsChecked)
                     addValues();
                 else if ((bool)subtraction.IsChecked)
                     subtractValues();
                 else if ((bool)multiplication.IsChecked)
                     multiplyValues();
                 else if ((bool)division.IsChecked)
                     divideValues();
                 else if ((bool)remainder.IsChecked)
                     remainderValues();
             }
             catch (Exception caught)
             {
                 expression.Text = "";
                 result.Text = caught.Message;
             }
         }

         private void addValues()
         {
             int lhs = int.Parse(lhsOperand.Text);
             int rhs = int.Parse(rhsOperand.Text);
             int outcome;
             outcome = lhs + rhs;
             expression.Text = lhsOperand.Text + " + " + rhsOperand.Text;
             result.Text = outcome.ToString();
         }

         private void subtractValues()
         {
             int lhs = int.Parse(lhsOperand.Text);
             int rhs = int.Parse(rhsOperand.Text);
             int outcome;
             outcome = lhs - rhs;
             expression.Text = lhsOperand.Text + " - " + rhsOperand.Text;
             result.Text = outcome.ToString();
         }

         private void multiplyValues()
         {
             int lhs = int.Parse(lhsOperand.Text);
             int rhs = int.Parse(rhsOperand.Text);
             int outcome;
             outcome = lhs * rhs;
             expression.Text = lhsOperand.Text + " * " + rhsOperand.Text;
             result.Text = outcome.ToString();
         }

         private void divideValues()
         {
             float lhs = float.Parse(lhsOperand.Text);
             float rhs = float.Parse(rhsOperand.Text);
             float outcome;
             outcome = lhs / rhs;
             expression.Text = lhsOperand.Text + " / " + rhsOperand.Text;
             result.Text = outcome.ToString();
         }

         private void remainderValues()
         {
             float lhs = float.Parse(lhsOperand.Text);
             float rhs = float.Parse(rhsOperand.Text);
             float outcome;
             outcome = lhs % rhs;
             expression.Text = lhsOperand.Text + " % " + rhsOperand.Text;
             result.Text = outcome.ToString();
         }

         private void quitClick(object sender, RoutedEventArgs e)
         {
             this.Close();
         }
     }
 }