Unable to save off DB changes using Entity Framework - sql

Question

I am pretty new to the EF world and am trying to understand why I am unable to save off changes to my phone record. I realize that I need to modify my entity but it doesn't seem to make a difference. I have tried using context.xxxx but I am getting an error that context is not defined. What is the using for context? If I change the phone type for the same user I want to update the record with the new info.
Phone definition:
namespace NewSMS.DATA.EF
{
using System;
using System.Collections.Generic;
public partial class Phone
{
public int Phone_ID { get; set; }
public string Phone_Number { get; set; }
public int User_PK1 { get; set; }
public int LU_Phone_Type_PK1 { get; set; }
public Nullable<bool> Available { get; set; }
public virtual LU_Phone_Type LU_Phone_Type { get; set; }
public virtual User User { get; set; }
}
}
Code:
if (phnMems != null && phnMems.Count > 0)
{
var smsPhn = new Phone { };
foreach (var item in phnMems)
{
smsPhn.Phone_Number = item.Phone_Number;
smsPhn.LU_Phone_Type_PK1 = item.Phone_Type_ID;
smsPhn.User_PK1 = obj.User_ID;
Phone phoneInfo = db.Phone.FirstOrDefault(n => n.User_PK1 == obj.User_ID);
if (phoneInfo == null)
{
db.Phone.Add(smsPhn);
db.SaveChanges();
}
else
{
smsPhn.Phone_ID = phoneInfo.Phone_ID; //keep userID
db.Entry(phoneInfo).State = EntityState.Modified;
phoneInfo = smsPhn;
db.SaveChanges();
}
}
} //End IF

Answer 1

smsPhn.Phone_ID = phoneInfo.Phone_ID; //keep userID
db.Entry(phoneInfo).State = EntityState.Modified;
In above code, you are assigning phone_ID in smsPhn object but updating phoneInfo object.
Just a Suggestion:
Move this declaration
var smsPhn = new Phone { };
inside foreach loop and call savechanges outside the loop.