How to Repair the System There is no key for Data.Edm.EdmEntityType.

System.InvalidCastException: Unable to cast object of type 'System.Int32' to type 'System.String'

I've been stuck trying to debug this issue. I believe the error Is occurring when I am trying to populate a drop down list.... IEnumerable<Customer> values = db.Customers.SqlQuery("SELECT * FROM Customer").ToList().Cast<Customer>(); IEnumerable<SelectListItem> items = from value in values select new SelectListItem { Text =...

Unable to cast Anonymous Type from 'System.Linq.IQueryable' to 'System.Data.Entity.Core.Objects.ObjectQuery'

The following query was working well with EF5 but gives me error with EF6. I use DbContext and CodeFirst....Error raised with EF6:...Unable to cast the type 'System.Linq.IQueryable...1[[<>f__AnonymousType5...4[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Cultur...

LINQ to Entities does not recognize the method 'System.String StringConvert(System.Nullable`1[System.Double])

I had the same problem and realized that I was using the wrong type of SqlFunctions. Make sure that you referenced the correct namespace: ...using System.Data.Entity.SqlServer; ...and not: ...using System.Data.Objects.SqlClient;

Cannot implicitly convert type System.Data.Entity.Core.Objects.ObjectResult to System.Data.Objects.ObjectResult

I had the error and none of these solutions worked (I was already using ...System.Data.Entity.Core.Objects..., it was also in the ...context.tt..., etc)....I eventually realised the problem lay between the keyboard and the chair. The stored proc finished with a select, but I was trying:...MyStoredProc_Result r = dbcontext.MyStoredPoc(); ...Instead ...

Error: Cannot implicitly convert type 'System.Data.Entity.DbSet' to 'System.Linq.IQueryable'

I am trying to follow the following tutorial: ASP.NET Web Forms Getting started with Web Forms and Visual studio (URL: ...http://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/introduction-and-overview...)....I have other names in my project but the idea is the same. I am trying to create a Reservations syst...

Update Database using Entity Framework having primary key on multiple Columns

Following is the error message I get:...Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. See ...http://go.microsoft.com/fwlink/?LinkId=472540... for information on understanding and handling optimistic concurrency exceptions....My model consis...

cannot convert from 'System.Data.Objects.ObjectParameter' to 'System.Data.Entity.Core.Objects.ObjectParameter'

While creating an ...ADO.NET Entity Data Model..., following error occured:...Error 66 Argument 10: cannot convert from 'System.Data.Objects.ObjectParameter' to 'System.Data.Entity.Core.Objects.ObjectParameter' D:\Aziz\Aziz Project\Development\Running Development\Web\pos\pos\Model1.Context.cs 351 278 pos...How is it possible to solve this error?...

Method not found: 'Void System.Data.Entity.DbModelBuilder.RegisterEntityType(System.Type)'

I'm using EntityFramework but in some cases I get this Exception:...threw an exception.", inner exception: "Method not found: 'Void System.Data.Entity.DbModelBuilder.RegisterEntityType(System.Type)'. ...Why is this exception is happening?...As I found out, this exception is happening when system expected to have EF 6.1.3, but the referenced EF is 6...

The argument types 'Edm.String' and 'Edm.Int32' are incompatible for this operation

it seems like you are following the MVC pattern. ...I got this error as well and it is because I was passing the id parameter as an integer instead of "string" as I declared in my model....Sample:...public class Object { public string id { get; set; } public string property1{ get; set; } public string property2{ get; set; } public s...

Cannot convert from system.data.common.dbconnection to system.data,sqlconnection

I am importing data from my excel file to sql database. I am using MVC 5 and entity framework 6. I am using epplus to import the data and sqlbulkcopy to import the data to sql. I am getting 3 errors: 1) excelImportDBEntities.Database.Connection 2) sqlbulkcopy is a namespace but used as a type 3) ObjectReader ...public async System.Threading.Tasks.T...