Use tab to control the DrawString

   
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form {

    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);

    Font f = new Font("Times New Roman", 12);
    Font bf = new Font(f, FontStyle.Bold);

    StringFormat sf = new StringFormat();
    float[] ts = { 10.0f, 70.0f, 100.0f, 90.0f };
    sf.SetTabStops(0.0f, ts);

    string s1 = "	A	AAA	AAAAA	AAAAAAAAAA";
    string s2 = "	AAAAAAA	AAAAA	AA	AAA";

    g.DrawString(s1, bf, Brushes.Black, 20, 20, sf);
    g.DrawString(s2, f, Brushes.Blue, 20, 20 + bf.Height, sf);

    f.Dispose();
    bf.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}