Entity attachment issues in LINQ

Question

I am trying to attach a LINQ entity to the data context after I receive it from a form POST. However, all I get is the following exception:

An entity can onl         


        

Answer 1

I solved by setting UpdateCheck=Never to my property in .Dbml file and context.entity.Attach(entity, true);

Answer 2

In the LinqToSQL designer set all of the Update Checks to Never and when you attach call it like so:

 context.entity.Attach(entity, true);

Alternatively, you could also grab the entity from the db and change it using the data from the POSTed entity, then submit that as a change.

Answer 3

Try following:

dataContext.People.Attach(person);
dataContext.Refresh(RefreshMode.KeepCurrentValues, person);
dataContext.SubmitChanges();