実行例
　c:> ScrlStr2.exe "あいうえお"
ScrlStr2.cs
//c:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /target:winexe ScrlStr2.cs
using System;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
public partial class TransparentTextScroller
	: Form
{
	private Timer timer;
	private string textToScroll = "テスト／test";
	private int position;
	private int position_y;
	public TransparentTextScroller()
	{
		this.StartPosition = FormStartPosition.Manual;
		this.Location = new Point(0, 0);
		this.Width = Screen.PrimaryScreen.Bounds.Width;
		this.Height = Screen.PrimaryScreen.Bounds.Height;
		this.TopMost = true;
		this.FormBorderStyle = FormBorderStyle.None;
		this.BackColor = Color.DarkSlateBlue;
		this.TransparencyKey = Color.DarkSlateBlue;
		this.Font = new Font("Meiryo UI", 32, FontStyle.Bold);
		this.DoubleBuffered = true;
		position = this.Width;
		position_y = (new Random()).Next(10, Screen.PrimaryScreen.Bounds.Height- 100);
		timer = new Timer();
		timer.Interval = 50;
		timer.Tick += Timer_Tick;
		timer.Start();
	}
	public void setString(String s)
	{
		textToScroll = s;
	}
	private void Timer_Tick(object sender, EventArgs e)
	{
		position -= 12; // スクロールの速度
		if (position < -TextRenderer.MeasureText(textToScroll, this.Font).Width)
		{
			//position = this.Width;
			//position_y = (new Random()).Next(10, Screen.PrimaryScreen.Bounds.Height- 100);
			Environment.Exit(0);
		}
		this.Invalidate();
	}
	protected override void OnPaint(PaintEventArgs e)
	{
		base.OnPaint(e);
		Brush brush = new SolidBrush(Color.White);
		Graphics g = e.Graphics;
		g.SmoothingMode = SmoothingMode.None;
		StringFormat sf = new StringFormat();
		GraphicsPath path = new GraphicsPath();
		path.AddString(textToScroll, this.Font.FontFamily,
		 (int)this.Font.Style, this.Font.Size, new PointF(position, position_y), sf);
		Pen p = new Pen(Color.Black, 4.5f);
		p.LineJoin = LineJoin.Round;
		g.DrawPath(p, path);
		g.FillPath(Brushes.White, path);
		p.Dispose();
		path.Dispose();
	}
}
static class Program
{
	[STAThread]
	static void Main(string[] args)
	{
		Application.EnableVisualStyles();
		Application.SetCompatibleTextRenderingDefault(false);
		TransparentTextScroller tts = new TransparentTextScroller();
		tts.setString(args[0]);
		Application.Run(tts);
	}
}