entity-framework-5

I'm trying to delete an object using EntityFramework 5 but i get this error. The object cannot be deleted because it was not found in the ObjectStateManager I am using the Remove() method as DeleteObject() is not present in EF5. Can anyone help what am I missing? This does not work for Remove localDb.Customers.Remove(new Customer() { CustomerId = id }); localDb.SaveChanges(); Another thing I tried from msdn to change the state to Deleted. But here it gives an error saying all the fields should be present. Is it necessary to get the complete record then delete? var customer = new Customer(){

I've got a database with a table of about 16,500 cities, and an EF Data Model (Database-First) for that database. I preload them into memory with the code: Db.Cities.Load() ...then when it's time to use them, I've tried each of the following queries: Dim cities() As String = Db.Cities.Select(Function(c) c.CityName).ToArray Dim cities() As String = Db.Cities.Local.Select(Function(c) c.CityName).ToArray The first query is fast (~10ms), but the second one takes about 2.3 seconds to run the first time (although it's faster than the first query when it's called after that). This doesn't make sense

I am having my first steps in EF 5.0 I have a many to many relationship. Movie can Have multiple Types and Type can have multiple Movies public class Movie { public int MovieId { get; set; } [Required] public string Name { get; set; } public virtual ICollection<Type> Types { get; set; } } public class Type { public int TypeId { get; set; } public string MovieType { get; set; } public virtual ICollection<Movie> Movies { get; set; } } When I generated the Database it creates many-to-many between Movie and type So, What should i do to seed this many to many table? I tried many solution posted

I'm binding list of entities to a data grid view like this: var orders = context.Order.ToList(); BindingList<Order> orderList = new BindingList<Order>(orders); dataGridView1.DataSource = orderList; User can edit or add new directly on datagridview. When user click Save button, in order to optimize performance, I want to retrieve list of entities that has been changed/new to perform insert/update. How can I achieve this? EDIT Define add new row to gridview: BindinList<Order> orders = (BindingList<Order>)dataGridView1.Datasource; order.Add(new Order()); EDIT 2 Solve: BindinList<Order> orders =

I have project based on .NET 4.0 but I need to use EntityFramework 5 in my solution. So I install it from the NuGet. After that I change target framework to .NET 4.5 (I'm using VS 2012) and rebuild project. But in reference folder I see that project use EntityFramework.dll version 4.4.0.0. Ho can I use newer version of EntityFramework? in web.config <compilation debug="true" targetFramework="4.5"> <assemblies> <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </assemblies> </compilation> Newer version (the real EF5) is dependent on .NET 4

I was following this tutorial, and I tried to add a few new columns in the userprofile table. And i tried to create a new table. public class UsersContext : DbContext { public UsersContext() : base("DefaultConnection") { } public DbSet<UserProfile> UserProfiles { get; set; } public DbSet<TestTabel> TestTabel { get; set; } } [Table("UserProfile")] public class UserProfile { [Key] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] public int UserId { get; set; } public string UserName { get; set; } public string Mobile { get; set; } public string FirstName { get; set; } public string

I have created an EDMX using EF 5 with the Model First approach, i.e. I started with a blank designer and modeled my entities. Now I want to be able to use this model defined in the EDMX but supply runtime SQL Server connection strings without modyfing the config file. I know how to pass a connection string to the DbContext but the issue is locating the metadata for the mappings within the assembly. For example, my EDMX has this connection string in the app.config <add name="MesSystemEntities" connectionString="metadata=res://*/Data.DataContext.EntityFramework.MesSystem.csdl|res://*/Data

I have 4 tables. OperationTable, ClientTable, ClientDetails, OperationRes ClientTable ClientID Name Surname Birthday VerNumber ClientDetails ClientID Email Adress Telephone OperationTable OperationID Date Time ClientID OperationRes ResID OperationID Name Type No i have page where we ask Client to fill a form to register for smth. Everything must be in one page and after Client submit the form, we must insert all data to it's table. Date and Time to OperationTable, Name and Surname to ClientTable and so on. I'm new in ASP.NET MVC. i have tried to use "Code Fisrt". I have created Model and just