how to change department id primary key to identity and do migration to database

Posted by Ahmedsa under ASP.NET MVC on 11/10/2016 | Points: 10 | Views : 391 | Status : [Member] | Replies : 0

I need to modify class Department to make Department ID identity then make affect by migrations to database sql server 2005 .

What I Try

I changed [DatabaseGenerated(DatabaseGeneratedOption.None)] from None to identity .

then from console write enable-migrations but it give me message

Migrations have already been enabled in project 'University Data'. To overwrite

the existing migrations configuration, use the -Force parameter.I also using

-Force but no any result or changed happened .

my class Department

public partial class Department {
public Department()
public int DepartmentID { get; set; }
public string DepartmentName { get; set; }


I have class department inside container Containerclass as following :

public partial class ContainerClass : DbContext     
public ContainerClass() : base("name=mycon")
public virtual DbSet<Department> Departments { get; set; }

Table department already created in database.


i write also in console

1- update-database but also nothing changed

2- add-migration Department but also nothing changed column DepartmentID not changed to identity

3- i add migration then write in up() and down()

AlterColumn("dbo.Department", "DepartmentID", c => c.Int(nullable: false, identity: true));
but it not change column to identity


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