Why does the ObjectStateManager property not exist in my db context?

How can I get around the problem "The name 'ConfigurationManager' does not exist in the current context"?

In case you get are trying to access the cloud configuration file in your Azure Cloud service and get the error...CloudConfigurationManager... does not exist in the current context...on ...CloudConfigurationManager... class, then all you need to do is add the nuget package ...Microsoft.WindowsAzure.ConfigurationManager... to your project. ...And th...

The name 'EntityState' does not exist in the current context

I fixed this issue as below...Namespace...using System.Data; using System.Data.Entity; ...I was working earlier in ASP.Net MVC C# application working fine for me. I fixed this issue as below...using System.Data; ...I was working earlier in ASP.Net MVC C# application working fine for me..._context.Entry(_Teach).State = System.Data.EntityState.Modifi...

Entity Framework: An object with the same key already exists in the objectstatemanager

This is due to inproper disposal of the database context, as you are never disposing of the context object itself you will run into these kinds of problems....I would suggest wrapping the code in a using statement.....using (var context = new MyContext()) { // Do my save code here... } ...That will ensure proper disposal of the context!

Multiple DB Contexts in the Same DB and Application in EF 6 and Code First Migrations

Entity Framework 6 added support for multiple ...DbContext...s by adding the ...-ContextTypeName... and ...-MigrationsDirectory... flags. I just ran the commands in my Package Manager Console and pasted the output below......If you have 2 ...DbContext...s in your project and you run ...enable-migrations..., you'll get an error (as you probably alre...

Entity Framework 6 context not retrieving navigation properties

I change the query code Ihad in Linq with this one.... internal Client GetClient(string userId, bool lazyLoadingEnabled = true) { using (var context = new ApplicationDbContext()) { context.Configuration.LazyLoadingEnabled = lazyLoadingEnabled; var client = context .Client ...

Getter properties not found for `DbSet`s on my `Context`

I think you have to add reference to ...EntityFramework.dll.... I had the same issue. Turns out, you need the ...EntityFramework.dll... reference (and not ...System.Data.Entity...)...Install-Package EntityFramework

Cannot drop the database 'DB', because it does not exist or you do not have permission

My bet is that you have ...AutomaticMigrationsEnabled... set to ...true..., otherwise your application wouldn't be trying to do anything with your database just because you pulled the latest version from TFS....Also, automatic migrations don't try to drop your database, not unless your have ...DropCreateDatabaseWhenModelChanges... or ...DropCreateD...

MVC6 error The name 'Configuration' does not exist in the current context

I ran into a similar issue when trying to add Configuration to an asp.net core project. I eventually ran into this blog post that explains how to define that Configuration property, which for some strange reason is not covered in the asp.net core documentation. ...http://www.mikesdotnetting.com/article/284/asp-net-5-configuration...Basically you ne...

Entity Framework DB updating but DB context not showing updates

Thanks to both Eric J and DevilSuichiro for helping me resolve my issue. The problem was that I should not have been trying to use the same DB context. By retrieving a new DB context instead of trying to reuse the same DB context I was able to verify my test results....Many thanks again.

LINQ query Where ID does not exist as a property in a list of objects

I will rewrite the question...I have a list (...someItems...) of objects with numeric IDs. I want to query a table ...PurchasedItems... in my database to give me all the rows where the ...FK_ItemID...do not... match the ID of any of the objects in my list ...someItems.......My answer:...List<Item> someItems = new List<Item>(); // Populate someItems...