public string CheckOut(int Customerid, int ShippingAddressId, string PaymentMethod)
{
List <int?> obj = new List <int?>();
using (var entities = new SedapExpressEntities())
{
obj = entities.CheckOut(Guid.NewGuid(), Guid.NewGuid(), Customerid, ShippingAddressId, PaymentMethod).ToList <int?>();
}
return(JsonConvert.SerializeObject(obj));
}