windows mobile 只能运行一个程序实例

 static class Program
     {
         [System.Runtime.InteropServices.DllImport("coredll.Dll", SetLastError = true)]
         private static extern int ReleaseMutex(IntPtr hMutex);

         [System.Runtime.InteropServices.DllImport("coredll.Dll", SetLastError = true)]
         private static extern IntPtr CreateMutex(string lpMutexAttributes, bool bInitialOwner, string lpName);
         /// <summary>
         /// 应用程序的主入口点。
         /// </summary>
         [MTAThread]
         static void Main()
         {
             try
             {
                 IntPtr hMutex = CreateMutex(null, false, "XXXXX");
                 if (System.Runtime.InteropServices.Marshal.GetLastWin32Error() != )
                 {
                     Application.Run(new FrmMain());
                 }
                 else
                 {
                     MessageBox.Show("程序已经运行.", "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1);
                     ReleaseMutex(hMutex);
                 }
             }
             catch (Exception)
             {

                 MessageBox.Show("发生未知错误,程序退出！");
                 Application.Exit();
             }

         }
     }