Clicking A MessageBox

            List<IntPtr> result = new List<IntPtr>();
            GCHandle listHandle = GCHandle.Alloc(result);
            try
            {
                IntPtr Window_hWnd = CloseMessageBox.FindWindowByCaption("#32770", "LastQuestion"); //Could use null as the first argument too. "#32770" represents classname Dialog.
                CloseMessageBox.EnumChildWindows(Window_hWnd, (hWnd, lParam) =>
                {
                    StringBuilder sb = new StringBuilder();
                    foreach (var control in GCHandle.FromIntPtr(lParam).Target as List<IntPtr>)
                    {
                        CloseMessageBox.GetWindowText(control, sb, 250);
                        if (sb.Equals("&No"))
                        {
                            CloseMessageBox.PostMessage(hWnd, CloseMessageBox.MouseDown, 0, 0);
                            CloseMessageBox.PostMessage(hWnd, CloseMessageBox.MouseUp, 0, 0);
                        }
                    }
                    return false;
                }, GCHandle.ToIntPtr(listHandle));
                //if (hWnd != IntPtr.Zero)
                //CloseMessageBox.PostMessage(Window_hWnd, CloseMessageBox.SysCommand , CloseMessageBox.Close, 0);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.ToString());
            }
            finally
            {
                if (listHandle.IsAllocated)
                    listHandle.Free();
            }