private void AddVendorControl()
 {
     vendorControl = new VendorControl();
     vendorControl.Location = new Point(15, 66);
     this.pnlMain.Controls.Add(vendorControl);
     vendorControl.SetEventHandler(new EventHandler(InsertVendor));
 }
 private void DeleteVendorControl()
 {
     if (this.pnlMain.Controls.IndexOf(vendorControl) > 0)
     {
         if (vendorControl != null)
         {
             this.pnlMain.Controls.Remove(vendorControl);
             vendorControl.Dispose();
             vendorControl = null;
         }
     }
 }