delphi - if else statement not executing right -


i have funny behaviour of if else statement. @ start memo empty , attempted deletion triggers message. if write in memo , try delete, again right message comes up. then, after last deletion (memo empty) if click once again delete second message , not first (nothing delete. messing if else statements ?? right way here ?

procedure tform1.advglowbutton2click(sender: tobject); begin    if advmemo1.isempty       showmessage('nothing delete !')    else      begin      if messagedlg('delete everything?',                      mtconfirmation, [mbyes, mbno], 0) = mryes begin        advmemo1.lines.clear;        advmemo1.lines.savetofile(extractfilepath(application.exename)+ '\memo.txt');      end;    end; end;

there nothing wrong code showed, isempty must returning false after last delete instead of returning true, suggests either 1) not deleted thought, or 2) isempty buggy.


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