Question

Been at this far too long; trying to populate a field in a record with a foreign key, it is dependent on which user is logged on.

Shown below is a view bag which displayed the Firstname of the customer in a dropdown, which the user had to select. It would then put the CustomerID into the record when it was created. This method was impractical

ViewBag.CustomerID = new SelectList(db.Customers, "CustomerID", "FName");

Below is an attempt to input the foreign key automatically by finding the CustomerID and then inputting the custoemrID into a hidden field on a form.

   public ActionResult Create()
    {
        var CusID = from c in db.Customers
            where c.UserName == "User.Identity.Name"
            select c.CustomerID;
    return View(new CarAdvert { UserName = @User.Identity.Name, CustomerID = CusID });
    }

The error: Cannot implicitly convert type system.linq.Iqueryable <-int-> to int

The approach taken (is this correct! – Any advice on the subject welcome)

any more info need please ask.

Answer 1

Regarding the error:

var CusID = (from c in db.Customers
        where c.UserName == User.Identity.Name
        select c.CustomerID).Single();

Instead of .Single you can/should use .First, .FirstOrDefault, … depending on your requirements.