Waiting for a task to done

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C#

hi programmers,
in my program i have a compute out of my program. i mean my program in meddle of codes, send a data to another program (which written by me) for computing and then it receive the computed data. (my connection between this two program is like Pipe C# Async Named Pipes[^])

after sending data for compute i need a delay for doing next line of codes until computed data come back.
my codes:

...
      _pipeClient = new PipeClient();
      _pipeClient.Send(Cloud_Intelligent_Output, "TestPipe", 1000);
      _ctr++;
      ( some code for waiting until result back )

... (Some other codes which i want stop running until result return back)

Please don't Timer and excuse from my awful Asking. :)