Problem with Inserting an item to a list

I am not sure if this is the appropriate forum for my question but I think it is more of a general c# problem than LINQ

I am running a LINQ query which populates a list used by a DropDownList, I need to insert an "Unassigned" value to the list. The function below queries the values correctly from the db but does not insert the "Unaasinged" value to the list. Please help.

Code:

public List GetTestList()
        {
            KeyValuePair item = new KeyValuePair(0, "Unassigned");

            using (DataClassesDataContext db = new DataClassesDataContext())
            {
                var Query = from records in db.TEST_SUITEs
                    orderby records.TEST_SUITE_ID
                    select new KeyValuePair
                    (
                        records.TEST_SUITE_ID, string.Format(records.TEST_SUITE_ID + " " + records.SUITE_TYPE + " " + records.SUITE_NAME)
                    );
                //Query.ToList().Insert(0, item);
                Query.ToList().Insert(0,item);
                return Query.ToList();
            }
        }