static void Main(string[] args)
{
northwindEntities db = new northwindEntities();
string companyName = "Exotic Liquids";
var startDate = DateTime.Parse("1980.01.21");
var endDate = DateTime.Parse("1999.01.22");
var income = db.uspSupplierIncome(companyName, startDate, endDate).First();
Console.WriteLine(income);
}