c# - Get return value from process -

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Hi, I am trying to do the following: I have a process that can take the parameters and return the sum of these. Numbers 

  process p = process. Start (sophysicalFilePath, Ultimate); Int results = P.ExitCode;

I get the return value from "ExitCode", the problem is: The program never eliminates its work before the process, when the program reaches this line 

  int result = P.ExitCode; I got an exception. My question is, how long will I wait for this process until this work is over, I am sorry that with the C # language I am working   
 
 
 Usage:  
  process p = process. Start (sophysicalFilePath, Ultimate); P.WaitForExit (); Int results = P.ExitCode;  
 
 to

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