Convert System.String to bstr

GMOBlotter::GMOBlotter(String^ TraderName, String^ TraderPassword, String^ XIPDBServer)
{
 ::bstr_t trader, pwd, server; 
 trader.Attach(static_cast(System::Runtime::InteropServices::Marshal::StringToBSTR(TraderName).ToPointer()));
 pwd.Attach(static_cast(System::Runtime::InteropServices::Marshal::StringToBSTR(TraderPassword).ToPointer()));
 server.Attach(static_cast(System::Runtime::InteropServices::Marshal::StringToBSTR(XIPDBServer).ToPointer()));
    ::MxEnumReturnCode ret;
 ret=pMxgXOM->Login(trader, pwd, server, L"GMO_INTRADAY",::MxeEncryptionMethodNone);
};