Compile Error!!!

[firix]

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// regex_simple.cpp
// compile with: /clr
#using <System.dll>

using namespace System;
using namespace System::Text::RegularExpressions;

int main()
{
   array<String^>^ sentence = 
   {
      "cow over the moon",
      "Betsy the Cow",
      "cowering in the corner",
      "no match here"
   };
    
   String^ matchStr = "cow";
   for (int i=0; i<sentence->Length; i++)
   {
      Console::Write( "{0,24}", sentence[i] );
      if ( Regex::IsMatch( sentence[i], matchStr,
                     RegexOptions::IgnoreCase ) )
         Console::WriteLine("  (match for '{0}' found)", matchStr);
      else
         Console::WriteLine("");
   }
   return 0;
}

using <system.dll> error is

bring your mouse pointer over.Is currently writing.
Error :"using requires C++/CLI to be ebanled.

[Null]

You need to enable C++/CLI somewhere in compiler options

Exactly the same problem is solved here: http://www.cplusplus.com/forum/general/30475/

[firix]

ok.
but I'm going to make active.