I'm starting a process within my C# application which runs a console application. I've redirected standard input and output, and am able to read a few lines via StandardOutput.ReadLine(). I'm convinced I have the ProcessStartInfo configured correctly.

The console application, when started, outputs a few lines (ending with a "marker" line) and then waits for input. After receiving the input, it again outputs a few lines (ending again with a "marker" line), and so on. My intention is to read lines from it until I receive the "marker" line, at which point I know to send the appropriate input string.

My problem is that, after several iterations, the program hangs. Pausing the debugger tends to place the hang within a call to StandardOutput.EndOfStream. This is the case in the following test code:

while (!mProcess.StandardOutput.EndOfStream) // Program hangs here.
{
    Console.WriteLine(mProcess.StandardOutput.ReadLine());
}

When I'm testing for the "marker" line, I get the same kind of hang if I attempt to access StandardOutput.EndOfStream after reading the line:

string line = "";
while (!isMarker(line))
{
    line = mProcess.StandardOutput.ReadLine();
}
bool eos = mProcess.StandardOutput.EndOfStream; // Program hangs here.

What might I be doing that causes this property to perform so horribly?