Texto vertical

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

namespace TextoVertical
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            string text1 = "Esto sirve para poco.";
            string text2 = "Pero es bonito.";
            FontFamily fontFamily = new FontFamily("Lucida Console");
            Font font = new Font(fontFamily,14,FontStyle.Regular,GraphicsUnit.Point);
            PointF linea1 = new PointF(100, 10);
            PointF linea2 = new PointF(120, 10);
            StringFormat stringFormat = new StringFormat();
            SolidBrush solidBrush = new SolidBrush(Color.FromArgb(255, 0, 0, 255));




            stringFormat.FormatFlags = StringFormatFlags.DirectionVertical;

            e.Graphics.DrawString(text1, font, solidBrush, linea1, stringFormat);
            e.Graphics.DrawString(text2, font, solidBrush, linea2, stringFormat);
        }
    }
}

https://msdn.microsoft.com/es-es/library/k7282y7x(v=vs.110).aspx

https://msdn.microsoft.com/es-es/library/da9f790s(v=vs.110).aspx