code-first

I have the following Model public class FilanthropyEvent : EntityBase, IDeleteable { public int Id { get; set; } public string Name { get; set; } public DateTime EventDate { get; set; } public string Description { get; set; } public decimal Target { get; set; } public decimal EntryFee { get; set; } public bool Deleted { get; set; } public ICollection<EventAttendee> EventAttendees { get; set; } } public class Attendee : EntityBase, IDeleteable { public int Id { get; set; } public string Email { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public bool

I have a codefirst EF-4.1 based program. The user gets a context and can modify some properties. When the user is done, I do a quick ChangeTracker.Entries().Any(e => e.State != EntityState.Unchanged); to determine if a SaveChanges() is required or not. If I do a 'SaveChanges()' call, the changes that have made are persisted to the database. This works for some properties, and doesn't work for others. Specifically it seems to work with simple types ( float s), and with collection hierarchies( ObservableCollection s). Am I doing something wrong? Ladislav Mrnka Yes this is a problem. Some

I am using entity framework 4 in my current project, to read data from several table. Compare using ADO.net, it EF is very easy, with simple code that can do lots of work or me. But there is one problem... e,g there is and exiting table call Table "MTable" i only want to query two column from this table, however this table is share with other two ppl who are also working on it. they might add column or modify constrains on this table. Only one thing i am sure is that, the two column i want to query they wont delete it or rename it. My application is runing now, but from time to time it break

I have a ResearchDatabase entity that has a many-to-many relationship with a Subject entity. i.e. a Research Database belongs in one or more Subject Categories, and a Subject Category contains one or more Research Databases. In my ResearchDatabaseConfiguration file I have the following mapping: HasMany(rd => rd.Subjects) .WithMany(s => s.ResearchDatabases) .Map(m => { m.MapLeftKey("DatabaseId"); m.MapRightKey("SubjectId"); m.ToTable("DatabaseSubjects"); }); OK, no problem. Works. Creates a link table. Now I have received a new specification. The ordering of the Research Databases in each

I'm trying to use MVC 3 with EF 4.1 using code first and am following Scott Guthries tutorial http://weblogs.asp.net/scottgu/archive/2011/05/05/ef-code-first-and-data-scaffolding-with-the-asp-net-mvc-3-tools-update.aspx . The issue I'm having is that when I create the products controller and the related scaffolded views, there is no "category" column being created in any of the views ("edit", "create", "index" etc), which according to the tutorial should be created. I've traced the reason why the column is not being shown is because of the t4 templates... it is failing a check to see if it is

I am getting a "keyword not supported error" when I try to connect to a LocalDB database using ObjectContext. This is my connection string: <add name="connStr" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=proj1db;Integrated Security=True" /> and this is the code that tries to create an instance of the ObjectContext: var connectionString = ConfigurationManager .ConnectionStrings["connStr"] .ConnectionString; ObjectContext _context = new ObjectContext(connectionString); The last line throws System.ArgumentException: Keyword not supported:

I have to design a web application using existing database of desktop application. As per existing database i have below class public class Company { #region Primitive Properties public virtual int CompanyID { get; set; } public virtual string CompanyName { get; set; } public virtual bool IsCustomer { get; set; } public virtual string CustomerCode { get; set; } public virtual bool IsPotentialCustomer { get; set; } public virtual bool IsSupplier { get; set; } public virtual string SupplierCode { get; set; } public virtual bool IsPotentialSupplier { get; set; } public CompanyCategoryCodes