c++ cli - IntelliSense: "#using" requires C++/CLI to be enabled

Question

#using <mscorlib.dll>
#using <System.dll>
using namespace System;
using namespace System::Text;
using namespace System::IO;
using namespace System::Net;
using namespace System::Net::Sockets;
using namespace System::Collections;

Errors: IntelliSense: "#using" requires C++/CLI to be enabled....

how to fix this prob!?

Answer 1

Your project settings are wrong. Specifically Configuration Properties, General, Common Language Runtime support.

Fall in the pit of success by starting your project by picking one of the project templates in the CLR node.