public static AscmWmsBackInvoiceMainService GetInstance()
 {
     if (ascmWmsBackInvoiceMainServices == null)
     {
         ascmWmsBackInvoiceMainServices = new AscmWmsBackInvoiceMainService();
     }
     return(ascmWmsBackInvoiceMainServices);
 }
 public static AscmWmsBackInvoiceMainService GetInstance()
 {
     if (ascmWmsBackInvoiceMainServices == null)
         ascmWmsBackInvoiceMainServices = new AscmWmsBackInvoiceMainService();
     return ascmWmsBackInvoiceMainServices;
 }