GPG - can't write anything

[Evolve]

Hi,

I'd like to write an application which would encrypt a file using GnuPG.
It would be a Windows Application which would run a GnuPG as a Console Application.

I found this code but it doesn't work properly.
http://www.codeproject .com/KB/security/gnupgdotnet.asp x

On the basis of this application I wrote a simple console application with some adjustments.

		public void ExecuteCommand() {

			StreamWriter sw;
			StreamReader sr;

			string gpgOptions = BuildOptions();
			string gpgExecutable = _bindirectory + "\\gpg.exe";

			// Create startinfo object
			ProcessStartInfo pInfo = new ProcessStartInfo(gpgExecutable, gpgOptions);
			pInfo.WorkingDirectory = _bindirectory;

			pInfo.CreateNoWindow = false; //true;
			pInfo.RedirectStandardInput = true;
			pInfo.RedirectStandardOutput = true;
			pInfo.UseShellExecute = false;

			_processObject = Process.Start(pInfo);

			Thread.Sleep(500);
			
			sw = _processObject.StandardInput;
			sr = _processObject.StandardOutput;

			sw.Write(_passphrase + Environment.NewLine);
			sw.Flush();


			sw.Write("y" + Environment.NewLine);
			sw.Flush();

			_processObject.Close();

These are my Buildoptions:
string sBuildOptions = @" --output KALIN01_1582020 _0012_08.sig --sign --encrypt --recipient KEY_ATVP_001 KALIN01_1582020 _0012_08.xml";

The code actually starts the GPG.EXE but it stops at the PassPhrase. Even I try to enter the passphrase from the application it simply does nothing.

As you can see I tried with pInfo.CreateNoW indow = false; //true; Having no success.

I really have no idea how to write some text by the application using StandardInput and not manually.

Thanks for any hint.