VolTeer.BusinessLogicLayer.VT.Vend.sp_VendorAddr_BLL.ListAddresses C# (CSharp) Méthode

        public List<sp_VendorAddr_DM> ListAddresses()
        {
            return DAL.ListAddresses();
        }

 public void TestVendorAddrDelete()
 {
     DataTable dt = cExcel.ReadExcelFile("Sheet1", Path.Combine(cExcel.GetHelperFilesDir(), "VendorAddr.xlsx"));
     foreach (DataRow row in dt.Rows) // Loop over the rows.
     {
         Guid vendorID = new Guid(row["VendorID"].ToString());
         sp_VendorAddr_DM data = new sp_VendorAddr_DM();
         data.VendorID = vendorID;
         sp_VendorAddr_BLL vendor = new sp_VendorAddr_BLL();
         vendor.DeleteAddressContext(data);
         var newdata = vendor.ListAddresses(vendorID);
         Assert.IsNull(newdata);
     }
 }