I am getting an Error \"An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.\"
I\'m trying to set up a TPC inheritance using Code First to model incoming and outgoing messages and the records therein.
This is probably very simple and I\'ll end up with a red face... class Person { public Guid Id {get;set;}
I\'m starting a new development and 开发者_运维知识库I plan to use Code First in Entity Framework 4.1.
I am having trouble changing the connection string used by entity framework code first for my project.I created a MVC3 project and then added two projects, DomainClasses and DataAccess.
I am trying to create the following constraint in my model so that a Tag object\'s TagType is valid. A valid TagType is one whose OperatingCompanyId 开发者_如何学Pythonmatches the Tag\'s Website\'s Op
After reverse engineering code first, I got entity classes and mapping. Most of the business classes (that I already have) have the same name as entity classes and most of the properties in entity and
I\'m trying to use SLQ server compact edition 4 together with entityframework 4.1 with code-first approach in a Windows form application.
I created an assembly (dll) with the following classes: Person.cs [Table(\"People\")] public class Person
Honestly I hate extension methods as disscussed before. I have a extension method as \"ApplySorting\" public static IQueryable<Brand> ApplySorting(this IQueryable<Brand> data,
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