static void GetTotalIncome(int startYear, int endYear, string companyName)
    {
        NORTHWNDEntities db = new NORTHWNDEntities();

        using (db)
        {
            SqlParameter startYearParam = new SqlParameter("@startYear", startYear);
            SqlParameter endYearParam = new SqlParameter("@endYear", endYear);
            SqlParameter name = new SqlParameter("@companyName", companyName);

            var income = db.Database.ExecuteSqlCommand("usp_FindTotalIncome @startYear, @endYear, @companyName", startYearParam, endYearParam, name);

            Console.WriteLine("Total income is {0}", income);
        }
    }