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private const int WM_SETREDRAW = 11;


[System.Runtime.InteropServices.
DllImport("user32.dll")]
static extern bool SendMessage(IntPtr 
hWnd, Int32 msd, Int32 wParam, Int32 
lParam);


/// 

/// Stop updates while we are 
/// filling a control with data
/// 

protected void BeginUpdate()
{
  SendMessage(this.Handle, WM_SETREDRAW, 0, 0);
  Cursor.Current = Cursors.WaitCursor;
}


/// 

/// Restart updates
/// 

protected void EndUpdate()
{
  SendMessage(this.Handle, WM_SETREDRAW, 1, 0);
  if (Parent != null)
  {
    Parent.Invalidate(true);
  }
  Cursor.Current = Cursors.Default;
}