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#include <string>
#include <iostream>
#include <cstdlib>

int main()
{
    const std::size_t nchars = 24 ;

{
        // work with wide characters
        const wchar_t wstr[ nchars + 1 ] = L"How\000Now\000Brown\000Cow!!!!!!!" ;

auto cli_str = gcnew System::String( wstr, 0, nchars );

for( int i = 0 ; i < cli_str->Length ; ++i )
        {
            if( cli_str[ i ] != 0 ) System::Console::Write( cli_str[ i ] ) ;
            else System::Console::Write( "<null>" ) ;
        }
        System::Console::WriteLine() ;
    }

{
        char cstr[ nchars + 1 ] = "How\000Now\000Brown\000Cow!!!!!!!" ; 
        
        // or convert array of char to array of wide char
        wchar_t wstr[ nchars + 1 ] = {0} ;
        for( std::size_t i = 0 ; i < nchars ; ++i )
            if( cstr[ i ] ) std::mbtowc( wstr + i, cstr + i, 1 ) ; // assumes that there are no multibyte chars
        
        auto cli_str = gcnew System::String( wstr, 0, nchars );

for( int i = 0 ; i < cli_str->Length ; ++i )
        {
            if( cli_str[ i ] != 0 ) System::Console::Write( cli_str[ i ] ) ;
            else System::Console::Write( "<null>" ) ;
        }
    }
    System::Console::WriteLine() ;
}

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Compilation time: 1.76 sec, absolute running time: 0.13 sec, absolute service time: 1.9 sec