The EntityContainer name must be unique. An EntityContainer with the name 'Entities' is already defined

Question

For a little background:

I have a DLL project with the following structure:

Rivworks.Model (project)  
  \\Negotiation (folder)  
      Model.edmx          


        

Answer 1

The other cause of this problem, your add model in any solution project and change your model project.

--PROJECT A --> MODEL.EDMX

--- WEB CONFIG -->Entity Connection

--PROJECT B

--- WEB CONFIG -->Entity Connection

Later, I think this structure is bad and Change project.

--PROJECT A
using PROJECT.C;
WEB.CONFIG - USE PROJECT C APP.CONFIG CONNECTIONSTRING 

--PROJECT B
using PROJECT.C;
WEB.CONFIG - USE PROJECT C APP.CONFIG CONNECTIONSTRING 

--PROJECT C  (CLASS LIBRARY) --> MODEL.EDMX 
--- APP.CONFIG -->Entity Connection

Everything was fine but I get an error. Error Detail : The EntityContainer name must be unique. An EntityContainer with the name 'Entities' is already defined

Because I forgot change Web.Config files.

OLD WEB.CONFIG

NEW WEB.CONFIG

This Problem is Simple but may cause loss of time. I wanted to give an example. I hope is useful.

Thanks.