vc++ open file with openfiledialog

I'm trying to open and read a file line by line and save each line to the array.

//this part is just openfiledialog and get the filename
OpenFileDialog^ fDialog = gcnew OpenFileDialog;
 fDialog->Title = "Open .mc File";
 fDialog->Filter = "MC FILES|*.mc";
fDialog->InitialDirectory = "c:\\";

if(fDialog->ShowDialog(this) == System::Windows::Forms::DialogResult::OK){
      MessageBox::Show(fDialog->FileName);
      ifs.open((fDialog->FileName)->c_str(), ifstream::ios_base);   //this line gives me an error
      while(ifs >> hex >> line){
                state.mem[i] = line;
                i++;
      }



If I use c_str(), it says error C2039: 'c_str' : is not a member of 'System::String'.
If I use ToCharArray() instead,  it says error C2664: 'void std::basic_ifstream<_Elem,_Traits>::open(const wchar_t *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'cli::array<Type,dimension> ^' to 'const wchar_t *'      

Does anyone know how to do what I want?

Thank you in advance :)

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