You can't just copy your EXE file to a new computer and it'll work: there are other framework components you need to install properly.
Start with a deployment project:
First look at deployment - Visual Studio | Microsoft Docs[
^] and remember that if your project needs SQL Se3rver, then you will need to provide some way for you user to identify where his server instance is located, and add the DB to that as part of your installation before your app is usable.