C# Accounting System Source

I need a fully-featured accounting system written in C# with a SQL Server back-end, and I expect the complete, well-documented source code. The application has to cover day-to-day accounting operations without errors and be simple for end-users to navigate. At minimum it must include these functional areas: • Invoicing • Inventory control • Expense and income tracking • Sales management • User and role management • Purchasing management • Employee records • Comprehensive, printable reports Please build it as a clean Visual Studio solution, using standard design patterns and clear naming so future developers can extend it easily. All database objects (tables, views, stored procedures) should be created through scripts that I can run on a fresh SQL Server instance. Before delivery I will test: 1. Accurate posting of every transaction to the ledger. 2. Real-time stock level updates after sales or purchase entries. 3. Role-based access preventing unauthorized operations. 4. Exportable reports (PDF or Excel) that match on-screen data. Send the executable, source, and SQL scripts in a single archive, along with a brief setup guide. If anything is unclear you can message me on Facebook at https://www.facebook.com/share/14bv7SsDBGc/ for quick clarifications.