Error HTTP Error 500.23-internal Server error error in VS2015 running ASPX old project

Today, I turned out the old project that I used VS2010 to run the ASPX page in VS2015, and an error occurred:
HTTP error 500.23-internal Server error An ASP. NET setting was detected that is not applicable in integrated managed pipeline mode.
Online search for a solution, found that the Chinese are not searchable, and then finally found in the StackOverflow,
Address: Http://stackoverflow.com/questions/14925383/http-error-500-23-internal-server-error-local-iis-web-server

Workaround add in Web. config
Source code copy (ie valid) print about <system.webServer> <validation validateintegratedmodeconfiguration= "false"/> &L T;/system.webserver>

Can, alas. It seems that you have to learn English well ...