how do i check if there is no filename?

how do i check if there is no filename entered in the
open file dialog and the user just press the cancel button
in the open file dialog?
procedure TEditForm.Open(const FileName: string);
begin
 PathName := FileName;
 Editor.Lines.LoadFromFile(PathName);
 Editor.SelStart := 0; <- error here when the user presses the cancel button in open file dialog...

 Caption := ExtractFileName(PathName);
 Editor.Modified := False;
end;
superboyAsked:
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puppyCommented:
hi superboy,
try this:
procedure TForm1.Button1Click(Sender: TObject);
label ok,nofile;
begin
OpenDialog1.execute;
if opendialog1.filename = '' then goto nofile
else goto ok;
ok:
editor.lines.loadfromfile(opendialog1.filename);
...
nofile:
end;
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superboyAuthor Commented:
i solved this problem already..i set a boolean flag to true when opening a file and this affects the canel button..the boolean flag is fileopened..thanx anyway..
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