import exsiting page to the editor

Hello

I know how to open blank editor,but what if I want to edit exsiting pages,how can I import it into the editor( in server side)?

this is the code that opend the editor

<CKEditor:CKEditorControl ID="CKEditor1" runat="server" Toolbar="Full" ContentsLangDirection="Ui" DialogButtonsOrder="OS"
EnterMode="P" ResizeDir="Both" ShiftEnterMode="P" StartupMode="Wysiwyg" ToolbarLocation="Top" >

and this is the page_load

protected override void OnLoad(EventArgs e)
{
CKFinder.FileBrowser _FileBrowser = new CKFinder.FileBrowser();
_FileBrowser.BasePath = "../../ckfinder";
_FileBrowser.SetupCKEditor(CKEditor1);



}

where is the place that I call exsiting pages to the editor for editing mode?

Thanks

Baaroz