private void DisableButtons()
 {
     if (btnTransfer.InvokeRequired)
     {
         DisableButtonsCB d = DisableButtons;
         btnTransfer.Invoke(d);
     }
     else
     {
         btnTransfer.Enabled = false;
     }
 }
 private void DisableButtons()
 {
     if (btnTransfer.InvokeRequired)
     {
         DisableButtonsCB d = new DisableButtonsCB(DisableButtons);
         this.btnTransfer.Invoke(d);
     }
     else
     {
         btnTransfer.Enabled = false;
     }
 }