Methods for WinForm to implement cross-process communication

public class WinMessageHelper
{
  private struct COPYDATASTRUCT
  {
    public IntPtr dwData;
    public int cbData;
    [MarshalAs()]
    public string lpData;
  }
  //COPYDATA for cross-process communication  public const int WM_COPYDATA = 0x004A;
  [DllImport("", EntryPoint = "SendMessage")]
  private static extern int SendMessage(
  int hWnd, // handle to destination window
  int Msg, // message
  int wParam, // first message parameter
  ref COPYDATASTRUCT lParam // second message parameter
  );
  [DllImport("", EntryPoint = "FindWindow")]
  private static extern int FindWindow(string lpClassName, string lpWindowName);
  /// <summary>
  /// Send a message  /// </summary>
  /// <param name="windowReceiveTitle">Receiver form title name</param>  /// <param name="strData">Data to be sent</param>  public static void Send(string windowReceiveTitle, string strData)
  {
    int winHandler = FindWindow(null,windowReceiveTitle);
    if (winHandler != 0)
    {
      byte[] sarr = (strData);
      int len =  + 1;
      COPYDATASTRUCT cds;
       = (IntPtr)100;
       = strData;
       = len;
      SendMessage(winHandler, WM_COPYDATA, 0, ref cds);
    }
  }
  /// &lt;summary&gt;
  /// Receive message  /// &lt;/summary&gt;
  /// &lt;example&gt;
  /// Overwrite the receiving message function in the form  /// protected override void DefWndProc(ref  m)
  /// {
  ///   switch()
  ///   {
  ///     case WinMessageHelper.WM_COPYDATA:
  ///       string str = (ref m);
  ///       break;
  ///     default:
  ///       (ref m);
  ///       break;
  /// 
  ///   }
  /// }
  /// &lt;/example&gt;
  /// <returns>Received data</returns>  public static string Receive(ref  m)
  {
    COPYDATASTRUCT cds = new COPYDATASTRUCT();
    Type cdsType = ();
    cds = (COPYDATASTRUCT)(cdsType);
    return ;
  }
}