Need to show whole text file in a edit box.

I have code below which loads a text file into an edit box on a dialog window.  Only it only show the first 100 or so characters.  I have scroll boxes etx, but how can I get it to show the whole text file in any length.  That way I can scroll down the text file in the edit box in the dialog window.  Am I using the wrong kind of variable.  It's set as a value and then CString.  I use ClassWizrad.

Please speak in laymens terms, I'm a newbie and will get lost easy if you use crazy words.

Here's my code.

void CNumbersDlg::OnLoadNumbers()
{
      // TODO: Add your control notification handler code
        // here

      //Will Load the Numbers.TXT File

      CFile f;
      if ( f.Open("E:\\Numbers.txt", CFile::modeRead)== FALSE )
            return;

      //Creare an archive odject
      CArchive ar( &f, CArchive::load );

      //Serialzie data from the archive into m_NumbersEdit
      ar >> m_NumbersEdit;

      //Close the archive
      ar.Close();

      //Close the file.
      f.Close();

      //Update screen with the Numbers information
      UpdateData(FALSE);
}