cross-thread operation not valid: Control " accessed from a thread other than the thread it was created

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C#

C#4.0

hi every one,

i have a method in which i want to display an image in the panel control.
first i put this picture in the picturebox then i add it to the panel control.

i am using two threads but it give me the error as i have mentioned in the subjection of this question.

error i am getting at line
this.agentbox.left = p.x;

anybody could give me suggestion please.

private delegate void DrawOnPanelCircleDelegate(Point pp, Bitmap r );
       public void DrawOnPanelCircle(Point p, Bitmap ratImage)
       {

           if (InvokeRequired)
           {
               DrawOnPanelCircleDelegate drwOnPanelCircle = new DrawOnPanelCircleDelegate((pp, r) => DrawOnPanelCircle(p, ratImage));
               this.BeginInvoke(drwOnPanelCircle, new object[] { p, ratImage });
           }


           lock (_locker)
           {
               this.agentBox .Image = ratImage;
               this.agentBox.SizeMode = PictureBoxSizeMode.StretchImage;

               //this.Invoke((MethodInvoker)delegate
               //{
                   this.agentBox.Left = p.X;
                   this.agentBox.Top = p.Y;
               //});  
               
              
              // Application.DoEvents();


           }