get return Value from Process

Question

Hi I am trying to do the following : I have a process this process can take parameters (digits) and return the sum of this numbers

Process P = Process.Start(sPhysicalFilePath, Param);
                int result = P.ExitCode;

I get the return value from "ExitCode" the problem is : the program sometimes finish his work before the process so when the program reach the line

int result = P.ExitCode;

I have an exception My question is how to wait this Process until it finish its work sorry I forget to say that's I am working with C# language

Answer 1

use:

Process P = Process.Start(sPhysicalFilePath, Param);
P.WaitForExit();
int result = P.ExitCode;

from MSDN