VBA (Visual Basic for Applications) is a programming language that is used in MS Excel files in order to automate the spreadsheets related operations. VBA macros are used to write user-defined functions that let you speed up the tasks you have to perform manually. In this article, you will learn how to work with VBA macros in MS Excel files programmatically. By the end of this article, you will be able to extract, add, and modify VBA macros in Excel workbooks using C#.