entity-framework-4.1

I need to compare strings using the string.CompareOrdinal(...) inside a linq query. string max; string min; var res = db.Table .Where(c => string.CompareOrdinal(c.Id, min) >= 0) .Where(c => string.CompareOrdinal(c.Id, max) <= 0) .ToList(); The code throws a exception: LINQ ti Entities does not recongnize the method 'Int32 CompareOrdinal(System.String, System.String)' method, and this method cannot be translated into a store expression. There are a lot of data in the table, so I really need the where clause. Is there a way around this? Update I'm not trying to deside if two strings are equal -

I'm using WCF Dataservices CTP2 with Entity Framework 4.1. Now then I'm trying to get any data through my datacontext I get this exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: There is a type mismatch between the client and the service. Type 'Crm.Objects.Segmentation' is not an entity type, but the type in the response payload represents an entity type. Please ensure that types defined on the client match the data model of the service, or update the service reference on the client. at

I have classes called Course, Student and Teacher like this public class Course { [Key, DatabaseGenerated(DatabaseGenerationOption.Identity)] public Guid CourseId { set; get; } public ICollection<Student> Students { set; get; } public Teacher Teacher { get; set; } } public class Student { [Key, DatabaseGenerated(DatabaseGenerationOption.Identity)] public Guid StudentId { set; get; } public ICollection<Course> Courses { set; get; } } public class Teacher { [Key, DatabaseGenerated(DatabaseGenerationOption.Identity)] public Guid TeacherId { get; set; } public ICollection<Course> Courses { get;

I'm new to MVC3 and have been following the awesome tutorials on the asp.net website. However, I can't quite wrap my head around how to use Unit of Work and Generic Repository patterns with Ninject. I used this tutorial as a starting point: http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application Without using interfaces, I know I can implement it like so: Generic Repository: public class GenericRepository<TEntity> : IGenericRepository<TEntity> where TEntity : class { internal MyContext context;

When running my first asp.net mvc application I got this error I thought that entity framework automatically would create the keys of column names that end with Id? isnt it correct? As you can see the ApplicantPositionID would be a table with 2 columns as primary key because it would relate to Applicants and also to Position. One or more validation errors were detected during model generation: System.Data.Edm.EdmEntityType: : EntityType 'ApplicantImage' has no key defined. Define the key for this EntityType. System.Data.Edm.EdmEntityType: : EntityType 'ApplicationPositionHistory' has no key