C# WinForms School App Bug Fixing

I have a small C# Windows Forms school management app (SQL Server + Entity Framework). I built it for fun and want someone to look through the code, find bugs, and fix them. What I need - Audit the project... (Budget: $30 - $250 USD, Jobs: .NET, ASP.NET, C# Programming, Data Protection, Database Management, Debugging, Microsoft SQL Server, Software Development, Software Testing, Training)