C# is a multi-paradigm, managed, object-oriented programming language created by Microsoft in conjunction with the .NET framework. C# can also be used with non-Microsoft implementations, such as Mono and Xamarin.Open Source
Open source software is software distributed under an open source license. Such a license specifically allows anyone to copy, modify, extend and redistribute the source code without paying royalties or fees to the original authors. Open Source Stack Exchange is a dedicated place for these questions as well.MIT
A short, permissive software license. Basically, you can do whatever you want as long as you include the original copyright and license notice in any copy of the software/source. There are many variations of this license in use.CurlSharp is a modern C# (5.0/async) binding against libcurl with a System.Net.Http.HttpMessageHandler implementation for use with .NET 4.5's System.Net.Http.HttpClient.