Program exits upon calling await

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Your problem is that await returns the control flow of the program to the caller of the function. Normally execution is continued at that point when the asynchronous task you await finishes.

So control is returned to your main function as you wait for printMessage and main now waits for a key input. As you hit the key main returns to the OS and your process (including all asynchronous tasks) terminates.

Change your InitializeMessageSystem to

private async Task InitializeMessageSystem ( )

and change the code in main to

InitializeMessageSystem().Wait();

to wait until InitializeMessageSystem finishes completely before waiting for the key.

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