My Primary Key is returning 0

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hi guys

I am trying to get the value of the primary key of my model

However I get 0

My code is

 if (ModelState.IsValid)
                {
                    context.Upload_Transaction.Add(upload_Transaction);
                    await context.SaveChangesAsync();

                    id = Upload_Transaction.Upload_TransactionID; 
                    ViewData["id"] = id; // For some reason this returns 0

                }

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