Are there any alternatives to IIS for Windows to run ASP.NET?
CassiniEx seems pretty old?
If you have any VisualStudio components installed, this will give you the IIS functionality on http://localhost:8080/ Dev server version may vary, of course (10.0 in the example below).
mkdir c:\inetpub\wwwroot
cd "C:\Program Files (x86)\Common Files\microsoft shared\DevServer\10.0"
WebDev.WebServer40 /port:8080 /path:"c:\inetpub\wwwroot" /vpath:"/"