with Memo1.Lines do begin Append('rtzui'); Append('ertgh'); end;
const cText: array[0..3] of string = ('wer', 'wert', 'edf', 'wesd');....var i: Integer;....for i:=0 to high(cText) do Memo1.Lines.Append(cText[i]);
Memo1.Lines.LoadFromFile('path-to-your-txt-file');
Memo1.Lines.commaText:='text1,text2,text3,text4';
Memo1.Lines.commaText:=Memo1.lines.commaText+',text1,text2,text3,text4';