Yes, you can develop without Visual Sturio. You could use csc or msbuild at the command line, you could use any of a range of alternative IDEs, or you could use Visual Studio Express, which is free.
The .NET framework is freely available to Windows users.
Alternatively if “free” and “free” isn’t good enough: Mono is also free, as is MonoDevelop.
solved Can i develop a .net project without visual studio ,if yes is .net framework is cost or freeware [duplicate]