Redirecting output from plink

I am currently trying to write a function that runs plink and captures the output from that process. When I try StandardOutput I get nothing and when I try StandardError I get "Unable to read from standard input: The handle is invalid." I can only assume that this means I am trying to read while plink is waiting for input. I am also passing my command via a text file called apCommands.txt. When I run this command manually it works and gives me the required output, I just can't figure out why I can't redirect that output so I can store it in a results file. Here is the code I have right now.
string pArgs = "-m \"" + ABSPATH + "\\apCommands.txt\" -ssh myHost -l user -pw password";
string output;
if (File.Exists(ABSPATH + "\\apTest.txt"))
File.Delete(ABSPATH + "\\apTest.txt");
StreamWriter apTest = new StreamWriter(ABSPATH + "\\apTest.txt");
Process runAP = new Process();
ProcessStartInfo apInfoStart = new ProcessStartInfo(ABSPATH + "\\plink.exe");
apInfoStart.Arguments = pArgs;
apInfoStart.RedirectStandardOutput = true;
apInfoStart.CreateNoWindow = true;
apInfoStart.UseShellExecute = false;
runAP.StartInfo = apInfoStart;
runAP.Start();
output = runAP.StandardOutput.ReadToEnd();
runAP.WaitForExit();
apTest.WriteLine("Standard Output");
apTest.WriteLine(output);
apTest.Close();
runAP.Close();
Thanks,
Joe

I see. I wasn't aware that it wasn't a reliable way to connect to ssh. As for the error message that was from standardError. I think the process may have been waiting for input when I was trying to read from StandardOutput and thats why I got that error message. Also instead of redirecting StandardOutput I tried redirecting the output directly into a file by running a cmd process and passing the commands I wanted to run through StandardInput. The underlined section is all I changed besides running this inside of a cmd process. This did work for me but I would rather know how to do it using StandardOutput.
string dArgs = "cd \"" + ABSPATH + "\"";
string pArgs = "plink -ssh myHost -m \"" + ABSPATH + "\\apCommands\" -l user -pw password > test.out";
Process runAP = new Process();
ProcessStartInfo apInfoStart = new ProcessStartInfo("cmd");
//apInfoStart.Arguments = pArgs;
apInfoStart.RedirectStandardInput = true;
apInfoStart.RedirectStandardOutput = true;
apInfoStart.CreateNoWindow = true;
apInfoStart.UseShellExecute = false;
runAP.StartInfo = apInfoStart;
runAP.Start();
runAP.StandardInput.WriteLine(dArgs);
runAP.StandardInput.WriteLine(pArgs);
I haven't tried reading the StandardOutput from this piece of code, but I will probably try it.
Thanks,
Joe

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