ASP.NET is a free web framework for building great full stack web apps with HTML, CSS, JavaScript, and C#.
ASP.NET MVC gives you a powerful, patterns-based way to build dynamic websites that enables a clean separation of concerns and gives you full control over markup for enjoyable, agile development.
NuGet is a free Visual Studio extension that makes it easy to add, remove, and update libraries and tools in Visual Studio projects.
You can easily find a web hosting company that offers the right mix of features and price for your applications.