About Gjensidige Insurance

Gjensidige Insurance is a multinational insurance company, which primarily is located in Scandinavia. The team of Analysis Denmark consists of 12 members, who examine and manipulate huge amounts of data. This data is turned into easily understandable graphs and sheets using Excel sheets or other similar tools. Many leaders throughout the company then examine this material and use it to better lead the company in the right direction.


We have been using a SAS server for processing our SAS applications and we needed it to output our data to Excel in a more advanced way than the SAS software allowed us to do. Furthermore, we needed it to be able to do so efficiently and without errors. We were a bit puzzled by which solution would be the best, but a simple C# application and a flat data file (.txt) seemed to work out quite well.


We chose Aspose.Cells for .NET as it seemed like a professional product that simply worked without any issues. The input from SAS data that was written to a flat .txt file by SAS, which was then read by our C# .NET application.

Below is an example of such a text file:

Data representation in Text file

This data was then inserted into an Excel template using our .NET application and Aspose.Cells for .NET. The issue concerning the right Excel solution for us was whether it could support our highly advanced Excel sheets with plenty of macros etc.

Preview of Filtering Solution in Excel format

An example of one of our filtering solutions in Excel that we needed Aspose.Cells to handle

We also needed it to not cause any issues with our SAS applications if any errors were encountered. Another important criterion was the ability to handle Excel sheets with a high amount of data without using a great deal of the server’s memory. Instead of having the usual approach of opening an entire Excel workbook, insert data into all worksheets and then save it, we chose to insert data into only one worksheet at a time. While this made performance worse, it helped prevent errors. After all, stability is the most important criteria for us.


Finding a solution

When we first contacted Aspose, we had been using Bytescout Spreadsheet SDK for 10 months. However, its performance was not good enough for us seeing as the output of a large Excel file could almost cause our server to halt. When using Bytescout Spreadsheet SDK with one of our larger outputs with more than 100.000 rows and 20 columns, the memory usage used to climb until the program crashed at around 1,5-2 gigabytes of allocated memory. However, once we switched to Aspose.Cells for .NET, the memory for writing the same amount of data climbed steadily to around 700 megabytes and at that point, it used to stop.


The transition from Bytescout Spreadsheet SDK to Aspose.Cells for .NET was extremely easy and took less than a day. There were no substantial challenges with using Aspose.Cells for .NET. We were worried concerning our large amounts of data, macros, and formatting, but Aspose.Cells for .NET handled all of those without any issues at all.


The outcome has been that we were able to let our servers handle all of our needs concerning the output of data from SAS to Excel and we did not encounter any errors while using Aspose.Cells for .NET.

Next Steps

We do not currently have any plans to take our solution further. However, we are thinking of ways to use Aspose’s products in order to directly output our data into other kinds of files such as PDF documents.


Aspose.Cells for .NET easily handled even large Excel sheets that would end up and did so extremely fast. Additionally, it handled all of our macros without any issues at all. We would therefore definitely recommend Aspose seeing as their product has handled all of our needs seamlessly without any real effort from our side.