c# - How to patch multiple properties in Web API

Question

I have written a method that patches one field of a user, the code for that method is

    [AcceptVerbs("PATCH")]
    public user PatchUser(user user)
    {
        user serverUser = db.users.Find(user.iduser);
        serverUser.profilepic=user.profilepic;
        db.SaveChanges();
        return serverUser;
    }

Right now i am using this code to patch by json , json is :

{
    iduser: 123,
    profilepic: "My profile link "
}

So how to modify this code to allow mutliple patches like i want to use the same url to patch other properties too. Like if i want to patch username the json should be:

{
    iduser: 123,
    username: "SomeUserName "
}