Be advised this posting and article came out prior to the second version of Entity Framework that shipped with .NET 4.0 and Visual Studio 2010. If you are using POCO classes (Plain Old CLR Objects), then you don’t need to copy values from one object to another, because you are using only one set of classes.

Cheers,
Tony

using (SQL context = new SQL(_conn))
{
// this works but uses reflection
//Work updatedWork = context.CreateEntityFromObject(“Works”, this);

Work updatedWork = new Work();
updatedWork.Id = Id; // P/K
updatedWork.UserIdAssignTo = UserIdAssignTo;
updatedWork.RowVer = Version; // for optimistic concurrency

Work.EntityKey = context.CreateEntityKey(“Works”, updatedWork);
// getting error on line above, the red under line is under Work.EntityKey
context.AttachAsModified(updatedWork);

try { context.SaveChanges(); }
catch (OptimisticConcurrencyException ex) { }
}

The line: Work.EntityKey = context.CreateEntityKey(“Works”, updatedWork); is throwing the following error:
An object reference is required for the non-static field, method, or property EntityKey.get

I’m a little confused as to how/why it works on yours, but not the code I wrote. I followed the inheritance chain from “Work”(that’s my EF object), It inherits from System.Data.Objects.DataClasses.EntityObject, and EntityObject implements the IEntityWithKey interface, with both public get/set. So it seems I should get access to it. Any help would be greatly appreciated.

If you are using a timestamp for concurrency and do not wish to retain other original values, then your only alternative is to re-query the database for the original entity.