This article describes how to create a custom function in Microsoft Excel using the ICustomFunction feature in the Aspose.Cells library. By loading an existing Excel file or creating a new Excel file, we can use the methods provided by Aspose.Cells to define and register custom functions and get the results. Finally, we save the modified Excel file to disk....//Open the workbook Workbook workbook = new Workbook (); //Obtaining...worksheet Worksheet worksheet = workbook . getWorksheets (). get (...