How to update only one field using Entity Framework?

Question

Here\'s the table

Users

UserId
UserName
Password
EmailAddress

and the code..

Answer 1

Entity framework tracks your changes on objects that you queried from database via DbContext. For example if you DbContext instance name is dbContext

public void ChangePassword(int userId, string password){
     var user = dbContext.Users.FirstOrDefault(u=>u.UserId == userId);
     user.password = password;
     dbContext.SaveChanges();
}