How to Ensure All Instances of a Process Have Exited After Using Process.Start()?

Ensuring All Process Instances Exit After Process.Start()

Launching external applications via Process.Start() often necessitates waiting for their completion before proceeding. This article details how to accomplish this, particularly when dealing with multiple instances of the launched application.

The simplest method utilizes WaitForExit() on the created Process object:

var process = Process.Start(...);
process.WaitForExit();

This blocks the calling application until the launched process exits. However, multiple instances of the application might run simultaneously. To address this, enumerate all processes with the target name and wait for each:

var processes = Process.GetProcessesByName("ABC");
foreach (var process in processes)
{
    process.WaitForExit();
}

This robust approach guarantees that execution resumes only after all instances of the application have finished.

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