[Solved] Entity Framework Error: Cannot insert explicit value for identity column in table when Identity Insert is set off

I want to save changes to the SQL table in a loop. I have the following code:

string[] request={"test1", "test2", "test3"};
TransactionData TTD = new TransactionData();
using ( IdContext = new ProofContext())
{
    foreach(var req in request)
    {
        TTD.Description = req;
        TTD.RecordId = 12;
        TTD.PaymentStatus = "Failed";
        IdContext.TransactionData.Add(TTD);
        IdContext.SaveChanges();
    }
}

I want to save three rows in the SQL table with three different ID. The table has one identity column and it is the primary key too. When I run my code, the changes are saved the very first time, but second time when I tried to save the changes, I got the error saying:

Cannot insert explicit value for identity column in table TransactionData when Identity Insert is set off.

I tried running this statement on SQL side in order to fix this error

SET IDENTITY_INSERT TransactionData ON

but still , I keep getting the error. This is the table model:

public partial class TransactionData
{
    public int InfoId { get; set; }  // this is the identity column in the database
    public decimal UnitPrice { get; set; }
    public decimal ServiceFee { get; set; }
    public decimal TotalAmount { get; set; }
    public string Sku { get; set; }
}

any help will be greatly appreciated