EF4 Code First: how to update specific fields only

How do I update only certain fields on an entity?

I have a User entity like so:

public class User
{
    public string UserId { get; set; }
    public string PasswordHash { get; set; }
    public bool IsDisabled { get; set; }
    public DateTime AccessExpiryDate { get; set; }
    public bool MustChangePassword { get; set; }
    public DateTime DateCreated { get; set; }
    public DateTime LastActivity { get; set; }
}

So if for example, I want to update the user entity, but do not want to change the user password, how do I do that?

Currently, I'm using the following code to update entities:

using (var _cnt = new STQContext())
{
   _cnt.Entry<Item>(item).State = System.Data.EntityState.Modified;
   _cnt.SaveChanges();
   return;
}

---

尝试这个：

using (var _cnt = new STQContext())
{
   _cnt.Users.Attach(user);
   _cnt.Entry<User>(user).Property(u => u.PasswordHash).IsModified = true;
   _cnt.SaveChanges();
}

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