C# - How to find the mouse position?

I was trying to draw a shape onto the screen using SwinGame. However I don't know how to set the shapes x, y to be at the mouse's position. (31th Line) in GameMain. Any helps?

GameMain.cs

 using System;
 using SwinGameSDK;
 using System.Text;
 
 namespace MyGame
 {
     public class GameMain
     {
         public static void Main()
         {
             Shape myShape = new Shape ();
 
             //Open the game window
             SwinGame.OpenGraphicsWindow ("GameMain", 800, 600);
             SwinGame.ShowSwinGameSplashScreen ();
             
             //Run the game loop
             while (false == SwinGame.WindowCloseRequested ())
             {
                 //Fetch the next batch of UI interaction
                 SwinGame.ProcessEvents ();
                 
                 //Clear the screen and draw the framerate
                 SwinGame.ClearScreen (Color.White);
                 //SwinGame.DrawFramerate(0,0);
                 
                 //Draw onto the screen
                 if (Input.MouseClicked (MouseButton.LeftButton))
                 {
                     SwinGame.DrawText ("The mouse works", Color.Black, 12, 200);
                     SwinGame.MousePosition();
 
                     myShape.Draw ();
                     SwinGame.RefreshScreen (60);
                 }
             }
         }
     }
 }

Shape.cs

 using System;
 using SwinGameSDK;
 
 namespace MyGame
 {
     public class Shape
     {
         Color _color = Color.Green;
         float _x = 0;
         float _y = 0;
         int _width = 100;
         int _height = 100;
         
         //properies
         public Color Color
         {
             get { return _color; }
         }
 
         public float X
         {
             get{ return _x; }
         }
 
         public float Y
         {
             get { return _y;}
         }
 
         public int Width
         {
             get { return _width;}
         }
 
         public int Height
         {
             get { return _height;}
         }
 
         public void Draw()
         {
             SwinGame.FillRectangle (_color, _x, _y, _height, _width);
         }
 
         public static bool IsAt(Point2D pt,float x,float y,float w, float h)
         {
             return true;
         }
     }
 }