How to make authentication in c# wpf?

Question

PHP

Hello! I ask this question how to authorize a user in wpf c#! I saw that you need to connect to the database and check if the user has such a password, etc. this does not suit me because I leave data in the trailer in the application so that a person who can decompile my application and I want to make it simple for example server/login.php$pas=password&email=email ! is there any logic in this? or do as do dudar?