title: Connecting multiple sql users to one database with entity framework
body: <p>Hello i am a beginner in C# winform,
  I have to connect multiple users (400 different users) through a login form ( textbox : name - password) to a single sql database with Winform C#, all users are sql users created in the database and have roles like users or admin.
  I have been looking for an easy way of doing this with entity framework but couldn't find anyhting.. anyone has an idea how this can be done ?
  Thanks for your help.</p>