Unable To generate a Controller

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I wish to Create A Code First Approach in a Database But
I Keep on Getting This Error When I Generate a Controller
I Always Get This Error Message

Unable To Retrieve Metadata for 'Identifications.Models.Identification'.
Value Cannot be null
Parameter name: key

This is my Model so Far

C#

namespace Identifications.Models
{
    public class Identification
    {

        public Int32 ID { get; set; }
        public string FullName { get; set; }
        public HttpPostedFileBase file { get; set; }

    }

    public class DbIdentification : DbContext
    {

        public DbSet<Identification> Identifications { get; set; }
    }
}

This is my ConnectionString so Far

C#

<connectionstrings>
    <add name="DbIdentification">
         <connectionString="server=.; database=Sample; Integrated Security=SSPI"
          providerName="System.Data.SqlClient"/>    
</connectionstrings>

Hope You Can Help me Out Here A Big Thanks!

Posted 1-Sep-14 1:05am

Member 10763264

Updated 1-Sep-14 1:16am

uspatel

v4

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3 solutions

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Yogesh Kumar Tyagi · Answer 1 · 2014-09-01T06:23:00

Solution 2

see it for learn with example code fist approuch.
http://weblogs.asp.net/scottgu/code-first-development-with-entity-framework-4[^]
http://codefirst.codeplex.com/[^]

Posted 1-Sep-14 6:23am

Yogesh Kumar Tyagi

uspatel · Answer 2 · 2014-09-01T01:15:00

EF require PK on each table so you need this

C#

namespace Identifications.Models
{
public class Identification
{

[Key]
public Int32 ID { get; set; }
public string FullName { get; set; }
public HttpPostedFileBase file { get; set; }

}

you can use more options from here
http://msdn.microsoft.com/en-in/data/jj591583.aspx[^]

Suraj Sahoo | Coding Passion · Answer 3 · 2014-09-24T02:30:00

Solution 3

This is code first entity framework, you are using so the Sql needs to know which is the primary key, it is going to set. So [key] attribute is needed.
Follow here[^]
Above link would give you code first conventions.
Thanks
:)

Posted 24-Sep-14 2:30am

Suraj Sahoo | Coding Passion