How to deploy a program when running a copy of this program?

Question

Programming

Good afternoon.
There is a small utility (wpf) in C#.
It is necessary to make it so that when starting the 2nd copy of itself, it unfolds the first one. I tried to change the "template" to prohibit the launch of the second copy, but something does not work out. Please tell me how to implement it. Thanks in advance

Answer 1

Here
is the Idea. Named mutex + send message.

Answer 2

WinAPI: CreateEvent, OpenEvent, SetEvent, WaitForSingleObject