C# Drawing

Question

HI Guys,

Im trying to add two convos boxes to my program to replace the current buttons i have. One to allow the user to select a colour for the ellipse and a Second which allows the user to draw a rectangle or square on the canvas. So if anyone's willing to have ago at helping me by editing my code I would be very greatful. 

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 WPFDraw

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        bool paint;

        int toolSelected;

        public MainWindow()

        {

            InitializeComponent();

            paint = false;

            toolSelected = 0;

        }

        private void canvas1_MouseDown(object sender, MouseButtonEventArgs e)

        {

            paint = true;

        }

        private void canvas1_MouseUp(object sender, MouseButtonEventArgs e)

        {

            paint = false;

        }

        private void canvas1_MouseMove(object sender, MouseEventArgs e)

        {

            Point p;

            p = e.GetPosition(canvas1);

            if (paint == true)

            {

                if (toolSelected == 0)

                {

                    Ellipse myEllipse = new Ellipse();

                    myEllipse.Fill = Brushes.Green;

                    myEllipse.Width = 30;

                    myEllipse.Height = 55;

                    myEllipse.Margin = new Thickness(p.X, p.Y, 0, 0);

                    canvas1.Children.Add(myEllipse);

                }

                 else if (toolSelected == 1)

                {

                    Ellipse myEllipse = new Ellipse();

                    myEllipse.Fill = Brushes.Red;

                    myEllipse.Width = 30;

                    myEllipse.Height = 55;

                    myEllipse.Margin = new Thickness(p.X, p.Y, 0, 0);

                    

                    canvas1.Children.Add(myEllipse);

                }

                 if  (toolSelected == 2)

                {

                    Ellipse myEllipse = new Ellipse();

                    myEllipse.Fill = Brushes.Blue;

                    myEllipse.Width = 30;

                    myEllipse.Height = 55;

                    myEllipse.Margin = new Thickness(p.X, p.Y, 0, 0);

                    canvas1.Children.Add(myEllipse);

                }

            }

        }

        

        private void buttonEllipse_Click(object sender, RoutedEventArgs e)

        {

            toolSelected = 0;

        }

        private void buttonEllipseRed_Click(object sender, RoutedEventArgs e)

        {

            toolSelected = 1;

        }

        private void buttonEllipseBlue_Click(object sender, RoutedEventArgs e)

        {

            toolSelected = 2;

        }

        // Event handler, that closes the program.

        private void CloseButton_Click(object sender, RoutedEventArgs e)

        {

            Close();

        }

        // Event handler, that restarts the program from the beginning.

        private void RestartButton_Click(object sender, RoutedEventArgs e)

        {

            System.Diagnostics.Process.Start(Application.ResourceAssembly.Location);

            Application.Current.Shutdown();

        }

        private void saveImage_Click(object sender, RoutedEventArgs e)

        {

        }

       

}

    

}

   

      PLEASE REMEMBER I NEED TO USE C# WPF