With Excel-DNA you can make native (.xll) add-ins for Excel using C#, Visual Basic.NET or F#, providing high-performance user-defined functions (UDFs), custom ribbon interfaces and more. This project ...

Enhanced mouse wheel scroll add-in for Microsoft Excel and Word. Horizonal scroll while Shift key is pressed and scroll by page when Alt key is pressed.

SmartArt is visually used to communicate information. We explain how to add and modify SmartArt diagrams in Microsoft Excel.

To fix an Excel spreadsheet not adding up correctly, check the SUM function's syntax and make sure there aren't any text format cells in the sheet.