EF4 Update Entity Without First Getting Entity

Question

How can I update an entity without having to make a call to select it. If I supply the key for the entity, should it not know to update after SaveChanges() is called on the

Answer 1

Maybe following code work fine.

var user = new User();
user.Id = 2;
context.Users.Attach(user);

user.Username = "user.name";
user.Name = "ABC 123";

context.SaveChanges();