What are names The apps to programming HTML and C#

Answer 1

Visual Studio (IDE) serve both and all Microsoft Technologies
https://www.visualstudio.com/vs/community/

if u looking for Code Editor(light weight) go fo Visual Studio Code
https://code.visualstudio.com

Answer 2

ehm...they're too different :D

For web I guess best now :
brackets/sublime +FF Dev Edition browser
(just don't use it for browsing i-net,it's just dev tool...you can,but that's dumb)

For c# ...someone else will answer :D