How do I convert System String to use it as the file names? Here is a skeleton of my program. I've tried for 2 years. PLEASE!

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C++/CLI

*** Removed all designer boiler plate code. It has nothing to do with the problem. ***

private: System::Void executeButton_Click(System::Object^  sender, System::EventArgs^  e)
{
    ifstream myInfile ("ReadText.txt");
    ofstream myOutfile ("SaveText.txt");

    if (myInfile.is_open())
    {
        do
        {
            char chOne;
            myInfile.get(chOne);

                // I want to manipulate the input here, which I'm unable to do using stream.

            myOutfile.put(chOne);
        } while (!myInfile.eof());

        myInfile.close();
        myOutfile.close();
        Form1::~Form1();
    }
    else
    {
        Form1::~Form1();
    }															
}

[edit]
Added from OP different question:
Just so you know, all I want to do is input file names into two text boxes(System String), and assign them to my ifstream and ofstream. I've tried string conversion and Marshal. All I get are Elem Trait errors and some kind of misdirection errors.
[/edit]