How to run code before program exit? [duplicate]

Try the ProcessExit event of AppDomain:

using System;
class Test {
    static void Main(string[] args)
    {
        AppDomain.CurrentDomain.ProcessExit += new EventHandler (OnProcessExit); 
        // Do something here
    }

    static void OnProcessExit (object sender, EventArgs e)
    {
        Console.WriteLine ("I'm out of here");
    }
}

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