could not load type 'system.data.entity.design.aspnet.entitydesignerbuildprovider'
asp.net, entity-framework-4
Solution
Open your web.config and add this line below in the Assemblies section:
<add assembly="System.Data.Entity.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
For more information, check this link:
http://forums.asp.net/t/1698282.aspx
Hope this helps
Problem
``` <add extension=".edmx" type="System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider" /> ``` this is the Assembly of my System Web.config file