C#

protected override void OnPaint(PaintEventArgs e)
{
  RectangleF rectF = GetRectFBoundsForControl(); // Made-up method to
    // get the bounds in which text can be drawn.
  e.Graphics.DrawString("Some multi-line text",
    this.Font,
    new SolidBrush(SystemColors.ControlText),
    rectF,
    StringFormat.GenericDefault); // Or create your own
}

protected override void OnPaint(PaintEventArgs e)
{
  base.OnPaint(e);
  IntPtr hdc = e.Graphics.GetHdc();
  DrawText(hdc, "Some Text", ...);
  e.Graphics.ReleaseHdc(hdc);
}

private SizeF MyMeasureMethod(PaintEventArgs e)
{
  string s = "Nick";
  Font f = new Font("Arial", 12);
  int width = 300;
  SizeF strSize = new SizeF();
  strSize = e.Graphics.MeasureString(s, f, width);
  return strSize;
}

treeview.SelectedNode = someNode;