ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS, and JavaScript.
Click the link Upload Avatar to test uploading the avatar api.
ASP.NET Web API is a framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices. ASP.NET Web API is an ideal platform for building RESTful applications on the .NET Framework.
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.