Hide remote desktop connection/ Process/ C#

Question

Please tell me how to hide the window to connect to the published application via RDP (remote app). Ie when I open rdp file through the function Process() my process run hidden, but unfortunately this process close immediately, and run new copy mststc.exe But it state is not hidden :(

private const string Arg = "C:\\RDP\\myapp.rdp";
private const string FileName =  "mstsc";
private Process _myProcess = new Process();
...
myProcess.StartInfo.FileName = sFileName;
myProcess.StartInfo.Arguments = arg;
myProcess.StartInfo.UseShellExecute = false;
myProcess.StartInfo.CreateNoWindow = true;
myProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
myProcess.Start();

Process mstsc = Process.GetProcessesByName(sFileName)[0];

mstsc.Id not equal myProcess.Id

I see that for first time run first copy mstsc.exe (i think processed/parse file), then for second time run ssecond copy mstsc.exe and first copy was killed