After copying a code from the help, try it, there is no run, and you can't find this namespace. depressed!
There is SYSTEM.WEB in the code, but the content of the next level is large, only three, not. In the help, there is SYSTEM.WEB.DLL file, so it is found that
"Adding Reference" Adds the DLL reference, that is, no longer reported.
Do you have to use anyone, you must also quote first?
