running next line of code after the process is completed

[Sher Shah]

Hello !!
i am new to coding and i am writing code in visual studio using c#.
I run a process there (basically double clicking a file which internally runs and give us output as text file).
In next line i wrote a code for getting that text file created as a result of process.
The problem is process running and giving text file as output take some seconds and mean while the next file which is getting text file says null. Because creation of text file need some seconds. Is there any method i can put a break or something so that when process.run is completed then next line of code should run.

Here is my code lines:

Process.Start(@"D:\example.gms");
List<string> lines = File.ReadAllLines(@"D:\My.txt").ToList();

 

[JohnH]

This should help:

Process.WaitForExit Method (System.Diagnostics)

Sets the period of time to wait for the associated process to exit, and blocks the current thread of execution until the time has elapsed or the process has exited. To avoid blocking the current thread, use the Exited event. For code examples, see the StandardError and the ExitCode property...

docs.microsoft.com

Waiting for several seconds should not be done in UI thread, if your app has that, then use a secondary thread to start and wait for the process.