Error : The object cannot be deleted because it was not found in the ObjectStateManager.

This article will show you how you can remove the remove the mention error “The object cannot be deleted because it was not found in the ObjectStateManager.” While performing the delete operation from .sdf database using linq query in entity framework.

Some of my previous articles are as follow: Error : Server-generated keys and server-generated values are not supported by SQL Server Compact, Multiple controls with the same ID '_header' were found. FindControl requires that controls have unique IDs. in Asp.net.

So here is the solution for the error “The object cannot be deleted because it was not found in the ObjectStateManager.”

StudentManagerEntitie objentity = new StudentManagerEntitie();             StudentDetail objstudentdetail = new StudentDetail();             objstudentdetail.Id = Id;             objentity.StudentDetails.Attach(objstudentdetail);             objentity.DeleteObject(objstudentdetail);             /*Save data to database*/             objentity.SaveChanges();

In above code please check the bold part of the code this code will help you to remove the error.