How to update not every fields of an object using Entity Framework and EntityState.Modified

Question

I need to update all fields except property1 and property2 for the given entity object.
Having this code:

    [HttpPost]
    public ActionResult Add(ob         


        

Answer 1

The answers above (most of them) use DbContext. For those who is using ObjectContext these solutions arent accessible.

Here is solution for ObjectContext strictly (EF5 .NET 4.5):

ctx.AddObject("ENTITYNAME", item);
ctx.ObjectStateManager.ChangeObjectState(item, EntityState.Modified);

var entry = ctx.ObjectStateManager.GetObjectStateEntry(item);
entry.RejectPropertyChanges("PROPERTY_TO_EXCLUDE");