.net - Visual C++ combobox question -

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i still new c++/cli in visual studio 2010 express.i trying add adapters name combobox, go error:

 error c2664: 'system::windows::forms::combobox::objectcollection::add' : cannot convert parameter 1 'std::string' 'system::object ^' no user-defined-conversion operator available, or       no user-defined-conversion operator available can perform conversion, or operator cannot called

my code is:

    public ref class form1 : public system::windows::forms::form { public:     form1(void)     {         initializecomponent();             ip_adapter_info adapterinfo[16];              pip_adapter_info padapterinfo;             dword buff=sizeof(adapterinfo);             dword getinfo = getadaptersinfo(adapterinfo, &buff);             padapterinfo = adapterinfo;                         {                 string desc = padapterinfo->description;                 combobox1->items->add(desc);//error here                 padapterinfo = padapterinfo->next;             }while(padapterinfo);     }

what system::object ? seem isn't straightforward in qt..also why constructor/variables loacted in .h file, not in separate .cpp file(assuming using default form1.h)


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