error: Namespace name 'EntityState' does not exist

Question

Hello,

 

I have a error:

The type or namespace name 'EntityState' does not exist in the namespace 'System.Data.Entity'

But, I have added reference System.Data. Kindly answer me.

 

 

using DAL.Model;

using System;

using System.Collections.Generic;

//using System.Data;

using System.Data.Entity;

using System.Linq;

using System.Linq.Expressions;

using System.Web;

 

 

namespace DMS.GenericRepository

{

public class GenericRepository<TEntity> where TEntity : class

{

internal DbSet<TEntity> dbSet; 

public virtual void Update(TEntity entityToUpdate)

{

dbSet.Attach(entityToUpdate);

context.Entry(entityToUpdate).State = System.Data.Entity.EntityState.Modified;

} 

}

 } 

 

Thanks Advance.