Find the error(s) in the following code. This is the definition for a Click event handler for a Button. This event handler should draw a filled rectangle on a PictureBox control.



 private void btnDrawImage_Click(

 object sender, System.EventArgs e)

 {

 // create an orange colored brush

 SolidBrush objBrush = new SolidBrush( Orange );

 // create a Graphics object to draw on the PictureBox

 Graphics objGraphics = picPictureBox.AcquireGraphics();



 // draw a filled rectangle

 objGraphics.FillRectangle( objBrush, 2, 3, 40, 30 );



 } // end method btnDrawImage_Click

When specifying a color for the SolidBrush you must precede the color name with

“Color.” You cannot just write the color name. Also, to retrieve the Graphics object, the CreateGraphics method must be used, not AcquireGraphics. The complete incorrect code reads:




 // DrawRectangle.cs (Incorrect)





 using System;


 using System.Drawing;


 using System.Collections;


 using System.ComponentModel;


 using System.Windows.Forms;


 using System.Data;





 namespace DrawRectangle


 {


 /// 


 /// Summary description for FrmDrawRectangle.


 /// 



 public class FrmDrawRectangle : System.Windows.Forms.Form


 {


 private System.Windows.Forms.Button btnDrawImage;


 private System.Windows.Forms.Label lblImage;


 private System.Windows.Forms.PictureBox picPictureBox;


 /// 


 /// Required designer variable.


 /// 



 private System.ComponentModel.Container components = null;





 public FrmDrawRectangle()


 {


 //


 // Required for Windows Form Designer support


 //


 InitializeComponent();





 //


 // TODO: Add any constructor code after InitializeComponent


 // call


 //


 }





 /// 


 /// Clean up any resources being used.


 /// 



 protected override void Dispose( bool disposing )


 {


 if( disposing )


 {


 if (components != null)


 {


 components.Dispose();


 }


 }


 base.Dispose( disposing );


 }





 // Windows Form Designer generated code





 /// 


 /// The main entry point for the application.


 /// 



 [STAThread]


 static void Main()


 {


 Application.Run( new FrmDrawRectangle() );


 }





 // draws a rectangle in the picture box


 private void btnDrawImage_Click(


 object sender, System.EventArgs e )


 {


 // create an orange colored brush


SolidBrush objBrush = new SolidBrush( Orange );





 // create a Graphics object to draw on the PictureBox


Graphics objGraphics = picPictureBox.AcquireGraphics();





 // draw a filled rectangle


 objGraphics.FillRectangle( objBrush, 2, 3, 40, 30 );





 } // end method btnDrawImage_Click





 } // end class FrmDrawRectangle


 }