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Executing a unix style piping command?
.binary.exe < input > output

ProcessStartInfo info = new ProcessStartInfo("binary.exe");
info.RedirectStandardInput = true;
info.RedirectStandardOutput = true;
Process p = Process.Start(info);

string Input;
// Read input file into Input here

StreamWriter w = new StreamWriter(p.StandardInput);
w.Write(Input);
w.Dispose();

StreamReader r = new StreamReader(p.StandardOutput);
string Output = r.ReadToEnd();
r.Dispose();

// Write Output to the output file

p.WaitForExit();