IntelliSense: “#using” requires C++/CLI to be enabled

Question

#using 
#using 
using namespace System;
using namespace System::Text;
using namespace System::IO;
using namespace System::Net;
         


        

Answer 1

Choose Project -> Properties from the menu bar. In the Project properties window, under Configuration Properties -> General, make sure that Common Language Runtime Support is set to Common Language Runtime Support (/clr)

In VS2019 it the steps would be :

• 1/ Right click on the project

• 2/ Project

• 3/ Properties

• 4/ Configuration Properties

• 5/ Advanced

• 6/ Common Language Runtime Support change it to Common Language Runtime Support(/clr)