¹ØÓÚDelphi if elseµÄÎÊÌâ

selectString1 := contentSelect1;
  selectString2 := contentSelect2;
  if(selectString1='')and(selectString2='') then
  begin
      with application do
          MessageBox('ÇëÑ¡Ôñ²éѯÌõ¼þ','ÌáʾÐÅÏ¢',MB_OK);
      end;
  end
  else if(selectString1='')and(selectString2 <>'') then begin /////³ö´í
      if(selectString2='Y') then begin
          With ADOQuery1 do
          begin
          Close;
          SQL.Clear;
          SQL.Add('Select * from jshk');
          SQL.Add(' where ´òӡ״̬=''Y'' and ¼à¹ÜÏîÄ¿ <>''0037''');
          Open;
          end;
      end else begin
          With ADOQuery1 do
          begin
          Close;
          SQL.Clear;
          SQL.Add('Select * from jshk');
          SQL.Add(' where ´òӡ״̬ <>