title: create new sheet with data in .csv file
body: <p>I create some .csv file and fill in with export data. This is my code:</p>
  
  <p><code></p>
  
  <pre><code>public void ExportGoodList(int id)
          {
              List&lt;LineItem&gt; lineItems = _lineItemService.FindAllByApplicationId(id).ToList();
              Response.Clear();
              Response.AddHeader("Content-Disposition", "attachment; filename=Carnet" + id + ".csv");
              Response.Flush();
              Response.Write("Item Description");
              Response.Write(",");
              Response.Write("No. of Pieces (numbers only are allowed)");
              Response.Write(",");
              Response.Write("Weight/Volume (numbers only are allowed)");
              Response.Write(",");
              Response.Write("\"Unit of Measure (the following values are allowed only: g, kg, t, l)\"");
              Response.Write(",");
              Response.Write("Value (in GBP) (numbers only are allowed)");
              Response.Write(",");
              Response.Write("Country of Origin (the codes of the countries are allowed only)");
              Response.Write(",");
              Response.Write(" Goods Type ID (numbers only are allowed)");
              Response.Write(",");
              Response.Write("\n");
              foreach (var item in lineItems)
              {
                  Response.Write(SanitizeData(item.Description));
                  Response.Write(",");
                  Response.Write(SanitizeData(item.NumberOfPieces));
                  Response.Write(",");
                  Response.Write(SanitizeData(item.Quantity));
                  Response.Write(",");
                  Response.Write(SanitizeData(item.QuantityUnits));
                  Response.Write(",");
                  Response.Write(SanitizeData(item.ItemValue));
                  Response.Write(",");
                  Response.Write(SanitizeData(item.CountryOfOrigin));
                  Response.Write(",");
                  Response.Write(SanitizeData(_goodsTypeService.GoodsTypeIdToUserDefinedId(item.GoodsType)));
                  Response.Write("\n");
              }
          }
  </code></pre>
  
  <p></code></p>
  
  <p>Then this file downloaded and I see all export data. This .csv file have only one sheet with data. My target is to create another additional sheet in this .csv file with another data. I don't know how to do it! </p>
  
  <p>Thanks!</p>