KillCassini

A Visual Studio extension to kill all instances of Asp.Net Web Development Server (Cassini) or IISExpress. This is an updated version of Latish Sehgal's KillCassini that works with VS2017 and beyond. See http://dotnetsurfers.com/blog/2011/02/19/killcassini-a-visual-studio-extension-to-kill-asp-net-web-development-server for more information.

Source: https://github.com/TheMrAnderson/KillCassini