.NET C# WEB AND WEB SERVICES BASED ACCOUNTING SYSTEM

I NEED A C# WEB ACCOUNTING SYSTEM WITH THE SAME FUNCTIONALITY THAN GNUCASH [login to view URL] It must be written with VStudio 2008 and will use linq connected to a SQL DB that u must develop, the system must be well modularized and programmed in diferent layers, all the UI functions will call web methods, no procedures will be executed in the UI . At the end u will give me the complete source code and a software architecture document. U must need to understand GNUCASH first that means u must manage open source tools too.