public static List <PaymentDTO> GetStudentPaymentsList(int studentId)
 {
     using (Gymnastics_Studio_DataEntities GSDE = new Gymnastics_Studio_DataEntities())
     {
         List <Payment> paymentList = new List <Payment>();
         paymentList = GSDE.Payments.Where(x => x.StudentId == studentId).ToList();
         return(PaymentDTO.ConvertListToDTO(paymentList));
     }
 }
 public static List <PaymentDTO> getPaymentList()
 {
     using (Gymnastics_Studio_DataEntities GSDE = new Gymnastics_Studio_DataEntities())
     {
         List <Payment> PaymentList = new List <Payment>();
         PaymentList = GSDE.Payments.ToList();
         return(PaymentDTO.ConvertListToDTO(PaymentList));
     }
 }