How to automatically start my application when my setup is done in C# setup project

I want that my application start after my setup is finished. I try to launch a cmd file in the custom actions but the VS setup project doesn't want to take the cmd file, this is an invalid custom action file.

I know that I can write an installer class, but is there an easy way to do this simple action?

How do I get a program to run automatically when logged in?

First, open the Settings app - a quick way to do it is by clicking or tapping on its button from the Start Menu. In the Settings app, open the Apps category. Select Startup on the left side of the window and Settings should show you a list of apps that you can configure to start when you log in.

check the following topic it's very useful: codeproject