private void SetPicTrueBoxVisible(bool flag)
 {
     try
     {
         if (this.InvokeRequired)
         {
             PicTureBoxVisibleCallBack pcb = new PicTureBoxVisibleCallBack(SetPicTrueBoxVisible);
             Invoke(pcb, new object[] { flag });
         }
         else
         {
             pictureBox1.Visible = flag;
         }
     }
     catch { }
 }
 private void SetPicTrueBoxVisible(bool flag)
 {
     try
     {
         if (this.InvokeRequired)
         {
             PicTureBoxVisibleCallBack pcb = new PicTureBoxVisibleCallBack(SetPicTrueBoxVisible);
             Invoke(pcb, new object[] { flag });
         }
         else
         {
             pictureBox1.Visible = flag;
         }
     }
     catch { }
 }