References for DBContext, DBSet<> in Entity Framework

Question

I am trying to use ADO.Net Codefirst feature of latest Entity Framework 4.0. As part of that I have installed Entity Framework CTP 4 from Microsft and using Scott's tutorial to create the model first. Inside the tutorial DBContext and DBSet<> is specified. Could some tell what is the reference to be used in order to access this class.

I have used the following references however nothing happens for DBContext and DBSet<>

System.Data.Entity
System.Data.Entity.Design

score 25 · Answer 1 · edited Sep 11 '15 at 13:41

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You can use the Library Package Manager if you have it (it installs automatically with MVC 3.0).

From within your project in Visual Studio 2010, go to

Tools > Library Package Manager > Package Manager Console

From within your project in Visual Studio 2013, go to

Tools > NuGet Package Manager > Package Manager Console

In the console, after the PM> prompt, type

install-package entityframework

This will install the package and add the EntityFramework reference to your project.

edited Sep 11 '15 at 13:41

user272735

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answered Apr 03 '11 at 03:36

Feckmore

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Install-Package : Unable to find package 'entityframework'At line:1 char:1 ...any idea why? – brntsllvn Jan 07 '16 at 18:01
Looking at NuGet-Solution package manager, I can see I have EntityFramework installed (v6.0.2)...but DbContext still could not be found. Any help would be great. – brntsllvn Jan 07 '16 at 18:07

score 14 · Accepted Answer · answered Feb 04 '11 at 14:00

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Use CTP5 instead it is newer version with some changes in API. You have to add reference to EntityFramework.dll which is installed in CTP directory - default is: c:\Program Files\Microsoft ADO.NET Entity Framework Feature CTP5\Binaries\EntityFramework.dll for 32bit system. On 64bit system it will be placed in Program Files (x86).

answered Feb 04 '11 at 14:00

Ladislav Mrnka

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Could you please tell will it support for 64 bit .Net version? – manu Feb 04 '11 at 14:17
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Not anymore. Now you would just use nuget Install-Module entityframework – Teun D Jan 15 '13 at 09:25
@TeunD: Yes, you can post it as separate answer. This answer was pretty valid for the version OP asked ... – Ladislav Mrnka Jan 15 '13 at 09:28
Instead of referencing entityframework.dll manually you can install the EntityFramework package from Nuget – Rowinson Gallego Apr 07 '13 at 19:12
Post is old...but now I think the link is broken. – Sandy Jan 15 '14 at 12:47

score 4 · Answer 3 · answered Feb 11 '11 at 08:21

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Use "DbContext" vs "DBContext", and "DbSet" vs "DBSet". The case sensitivity is the issue.

answered Feb 11 '11 at 08:21

Thomas Edmondson

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Thomas, I have just speciied the code, not copying and pasting this. I used the correct case in my code as it was copied from original tutorial. However thanks for letting me know that the keywords are in incorrect case. Cheers. – manu Feb 11 '11 at 09:28
thats it...I did the mistake. – Bimal Das Feb 01 '16 at 13:40

Josh M. · Answer 4 · 2014-01-15T17:05:42.120

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To add EF to your project use the Package Manager Console and issue the command:

Install-Package EntityFramework

You shouldn't link directly to the DLLs' installed location as mentioned in another answer.

edited Jan 15 '14 at 17:05

answered Apr 26 '13 at 20:52

Josh M.

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score 1 · Answer 5 · edited Aug 05 '13 at 03:12

I was following the MvcMusicStore Tutorial (using Mvc 4 instead of Mvc 3).

I found in Part 4 I was having issues with this (http://www.asp.net/mvc/tutorials/mvc-music-store/mvc-music-store-part-4).

When I added the following reference using System.Data.Entity;, I got the following error:

the type or namespace name 'entity' does not exist in the namespace 'system.data'

@Fecklmore's solution worked for me.

Open the Package Manager Console by going to Tools > Library Package Manager > Package Manager Console.

Then type in the following: Install-Package EntityFramework

This will install EntityFramework (i.e. EF) into your project, and will eliminate the error above.

score 1 · Answer 6 · answered Feb 04 '11 at 14:00

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The blogpost mentions the assembly:

The DbContext and DbSet classes used above are provided as part of the EF4 Code-First library. You’ll need to add a reference to the System.Data.Entity.CTP assembly that is installed into the \Program Files\Microsoft ADO.NET Entity Framework Feature CTP4\Binaries directory to reference these classes. You’ll also want to add a “using System.Data.Entity” namespace statement at the top of your “NerdDinners” class file.

However I do believe the new CTP5 includes some changes to codefirst, so I would suggest to take a look at that one instead.

answered Feb 04 '11 at 14:00

Yannick Motton

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Could you please tell will it support for 64 bit .Net version? – manu Feb 04 '11 at 14:17
I am unsure if there are 64bit assemblies in the CTP. If not, your project will need to target x86. – Yannick Motton Feb 04 '11 at 14:50

score 0 · Answer 7 · answered Jun 15 '11 at 16:12

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if you are using .NET 3.5 then change your target framework to .NET 4.0

answered Jun 15 '11 at 16:12

Arek Bee

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Thanks indeed @Arek Bee, I have used .Net 4.0 however some how reference is not there for Entity due to some reason. Later after installing the CTP5 everything was fine – manu Jun 17 '11 at 16:47

References for DBContext, DBSet<> in Entity Framework

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