The type 'System.Data.Entity.DbContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'EntityFramework 2

.net entity-framework

Question

I've got one solution - the one project is class library with .edmx data model The other is asp.net web forms project.

when i start the solution I get the following exception:

The type 'System.Data.Entity.DbContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

and when I see the references in my asp.net project I see the reference to my class and I can't see reference to entity framework. But the problem is that entity framework is installed both in my class library and web project

1
47
7/12/2014 5:18:57 AM

Fastest Entity Framework Extensions

Bulk Insert
Bulk Delete
Bulk Update
Bulk Merge

Accepted Answer

I think your EntityFramework version was confused

Please download the correct version by using the NuGet package installer.

See this discussion for getting started: The type or namespace name 'DbContext' could not be found

And look this same problem and Answer : is Here

62
5/23/2017 12:10:38 PM

Popular Answer

I found this solution suitable for me.

Adding Entity Framework DLL Reference:-

  1. Go to c:\Program Files (x86)\Microsoft ASP.NET\ASP.NETMVC 4\Packages\EntityFramework 5.0.0-rc\lib\net45

  2. Add Entity framework DLL

Mazhar Khan

Related Questions

Using MVC, Entity Framework cannot find assembly reference

You may find this new MVC 3 / EF tutorial series helpful: ...http://www.asp.net/entity-framework/tutorials/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application... It is based on Code First and the latest Tools Update for MVC 3.
asp.net-mvc-3 c# entity-framework
asked by tdykstra

Can't call DeleteObject in Entity framework - missing an assembly reference?

The documentation for the DbContext in EF4.1 seems to show that it doesn't include a delete method on that class: ...http://msdn.microsoft.com/en-us/library/system.data.entity.dbcontext(v=vs.103).aspx...... ...This question looks similar - might be some help: ...MVC 3 EF 4.1 dbContext - Deleting one-to-many data object with non-nullable foreign-key...
asp.net-mvc c# entity-framework
asked by Dave

Why am I getting a NullReferenceException in System.Data.Entity.dll (Entity Framework)?

If it's only for Nevada then it must be a data problem, do a thorough check in the db....And to summarize, the core problem was: ...It was db-first. ...... was returning a null value for one of the fields that was marked in EF as not null
c# entity-framework wpf
asked by Henk Holterman

Why there are both EntityFramework and System.Data.Entity assemblies in my project?

You should have both assemblies:...EntityFramework.dll... (has DbContext API, Code First)...System.Data.Entity.dll... (has ObjectContext and DbContext APIs, new features)...The need for two assemblies are to allow the Entity Framework team to release updates without waiting for the next official release of the .NET Framework. ...EdmFunction.IsCompo...
.net entity-framework visual-studio-2012
asked by Matija Grcic

Could not load type 'System.Data.Entity.DbSetExtensions' from assembly 'EntityFramework

A refresh of ASP.NET Identity that fixes this issue and supports EF6 RC will be available very soon....UPDATE: the new version is ...available in NuGet....
asp.net-identity asp.net-mvc-5 entity-framework entity-framework-6
asked by divega

Assembly 'EntityFramModel' uses EntityFramework 5.0 which has a higher version thhan the referenced assembly

Since you use your edmx in your webproject you need to reference the same Entity Framework dll in the web project as you have in your library. Your error suggests, that you use a different version of the entity dll.
asp.net entity-framework
asked by Mike

Could not load type 'System.ComponentModel.DataAnnotations.DatabaseGeneratedOption' from assembly 'EntityFramework' error

Have you removed all references to System.Data.Entity dll
entity-framework entity-framework-6
asked by ErikEJ

System.Data.Entity.DbContext can't find to add as a reference

Select the project which throws this error...Go to the menu View -> Other windows -> Package Manager Console...Make sure your problematic project got selected in the default Project" drop-down in the PMC console....then type the command "install-package entityframework -version 5.0.0.0"...It should install the missing version.
c# entity-framework
asked by Senthil

Could not load file or assembly: The located assembly's manifest definition does not match the assembly reference

Looks like you missed updating an assembly reference in one of your modules....Easiest fix is to run the DevExpress ProjectConverter (default location ...C:\Program Files (x86)\DevExpress 15.2\Components\Tools\Components...). It will fix the references in all files (and subfolders)....If you have any more trouble, the ...DevExpress Support Center..
asp.net c# devexpress entity-framework-6 xaf
asked by shamp00

How to trigger Update-Database on a DbContext in a referenced assembly (NuGet package)

When migrations are first enabled by ...Enable-Migration..., a ...Configuration.cs... file will be added to the project. If this file exists for ...Core.Project.Data..., tell Entity Framework to use this config:...Update-Database -ConfigurationTypeName Core.Project.Data.Migrations.Configuration -ProjectName Core.Project.Data
c# dbcontext entity-framework entity-framework-6
asked by Georg Patscheider

Fastest Entity Framework Extensions

Bulk Insert
Bulk Delete
Bulk Update
Bulk Merge
View more on Stack Overflow

Prime Library

Performance

Expression Evaluator

More Projects...

Related

Licensed under: CC-BY-SA with attribution
Not affiliated with Stack Overflow
Licensed under: CC-BY-SA with attribution
Not affiliated with Stack Overflow