Fill in ComboBox Items

If you want to give the certain data at a fielad of table, you may use the combobox. Combobox will facilitate user to just make selection of list of data.

You can use a text file read as line of data by Readln() procedure. Text file will be read started from begining line until last line by repeat .. until statement.

You might write line of data possibly at random, it will be sort automatically by,
Combobox1.Sorted:= true;

procedure TForm1.Button1Click(Sender: TObject); var F: TextFile; S: string; begin ComboBox1.Clear; ComboBox1.Sorted:= true; AssignFile(F, 'category.txt'); reset(F); try Repeat Readln(F, S); ComboBox1.Items.Add(S); Until eof(F); finally CloseFile(F); end; end;