Table Problem

[mustafa06]

tbRead = TextFile.ReadToTable("C:\\My File.txt");
tbFile= Dialog.FileBrowse(true, "Locate File", tbRead[1], "File (*.*)|*.*|", "", "dat", false, false);
if tbFile[1] ~= "CANCEL" then
   tbFull = Table.Concat("C:\\My File.txt", "\r\n", 1, TABLE_ALL); --Error 
   Table.Insert(tbFull, 1, tbFile[1]);
   Table.Remove(tbFull, 2);
   TextFile.WriteFromTable("C:\\My File.txt", tbFull, false);
end

Help please

[mustafa06]

how can edit text file line 1 or 2 or 3 etc..?