Entity DataSource not working with Entity Framework 6 Upgrade

I just went through this exercise when upgrading to EF 6 from EF 5 and I had the same errors.

Here is what I had to do.

Install-Package Microsoft.AspNet.EntityDataSource

It would register a new EntityDataSource Control in the web.config under pages:

<pages>
  <controls>
    <add tagPrefix="ef" assembly="Microsoft.AspNet.EntityDataSource" namespace="Microsoft.AspNet.EntityDataSource" />
  </controls>
</pages>

Next step is to replace existing <asp:EntityDataSource /> controls to <ef:EntityDataSource /> in your aspx pages.

Final step is to go in your code behind and update references for EntityDataSourceContextCreatingEventArgs or any other type of EFContext tags.

From

protected void OnContextCreating(object sender, EntityDataSourceContextCreatingEventArgs e){... } 

To

protected void OnContextCreating(object sender, Microsoft.AspNet.EntityDataSource.EntityDataSourceContextCreatingEventArgs e){... } 

It all worked and I didn't have to reference System.Data.Entity in the assembly.

The Entity DataSource control for EF6 is available in preview since 2014-01-30 (details in this Microsoft announcement). It is available as a nuget package : http://www.nuget.org/packages/Microsoft.AspNet.EntityDataSource/

If you try to download it from the nuget package manager, be sure to select the "include prerelease" item in the top combo Box.