ADO.NET Entity Framework : Editing a detached Object

In Layered scenario, you might need to pass an object to another method while updating. Carrying open Context is not good however you may try the below approach by using “CreateEntityKey”. But this will not work if you have configured your edmx with Stored Procedure, reason behind that is

static void Main(string[] args)


//Create Entity Key Object

EntityKey key;

object originalItem;

//This object can come through method parameter

Emp updatedItem = new Emp() { Id = 190 };

updatedItem.FirstName = "Changed Last Name";

using (TestDBEntities ctx = new TestDBEntities())


key = ctx.CreateEntityKey("Emp", updatedItem);

if(ctx.TryGetObjectByKey(key, out originalItem))


ctx.ApplyPropertyChanges(key.EntitySetName, updatedItem);