Solve your problem using Microsoft Excel, and let ExcelEverywhere generate an ASP or ASP 
NET-page. The ASP-page looks like and calculates like the spreadsheet. No programming required. Easy updating, fix spreadsheet and generate. Supports 190 Excel-functions.
Code-behind module in C# and VB.NET for backend-integration. Use it for expense reports, surveys, order forms, financial advisor, ROI-calculator, engineering.
No Excel needed on server!