I'm trying to change old GUI C# app. Program is XML file converter in output I have XLS file. I have task to create new file format instead of XLS, it should be XML.
Algorithm is complicated and I don't won't to write it from beginning.
In Excel we can simple 'Save as' XML and it works, but I'm unavailable to do this in C#.
File format is Microsoft.Office.Interop.Excel.Workbook workbook = null;