Guide to Writing Custom Functions in Excel: Part I, Using VBA

I am a freelance software developer with a variety of different interests. My main area of expertise is Microsoft Office add-ins (Excel/Outlook mostly) but I also develop Windows applications, Access Databases and Excel macros . I develop in VBA, C# and C++. My website exceladviser.com has articles on Excel, Access, Microsoft Office development, and general Windows programming (WPF, etc.).