Resize TextBox in C#.net

  private void txtWidth(TextBox txt)
        {
            System.Drawing.Graphics g = txt.CreateGraphics();
            float maxwidth = 0f;
                float w = g.MeasureString(txt.Text, txt.Font).Width;
                if (w > maxwidth)
                    maxwidth = w;
                g.Dispose();

                txt.Width = (int)maxwidth; 
        }