ScreenSaver.cs

using System;
using System.Windows.Forms;

namespace ScreenSaver
{
public class DotNETScreenSaver
{
[STAThread]
static void Main(string[] args)
{
if (args.Length > 0)
{
if (args[0].ToLower().Trim().Substring(0,2) == "/c")
{
MessageBox.Show("This Screen Saver has no options you can set.", ".NET Screen Saver", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
else if (args[0].ToLower() == "/s")
{
for (int i = Screen.AllScreens.GetLowerBound(0); i <= Screen.AllScreens.GetUpperBound(0); i++)
System.Windows.Forms.Application.Run(new ScreenSaverForm(i));
}
}
else
{
for (int i = Screen.AllScreens.GetLowerBound(0); i <= Screen.AllScreens.GetUpperBound(0); i++)
System.Windows.Forms.Application.Run(new ScreenSaverForm(i));
}
}
}
}


ScreenSaverForm.cs

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ScreenSaver
{
public class ScreenSaverForm : System.Windows.Forms.Form
{
private Point MouseXY;
private int ScreenNumber;

public ScreenSaverForm(int scrn)
{
InitializeComponent();
ScreenNumber = scrn;
}
private void ScreenSaverForm_Load(object sender, System.EventArgs e)
{
this.Bounds = Screen.AllScreens[ScreenNumber].Bounds;
Cursor.Hide();
TopMost = true;
}

private void OnMouseEvent(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (!MouseXY.IsEmpty)
{
if (MouseXY != new Point(e.X, e.Y))
Close();
if (e.Clicks > 0)
Close();
}
MouseXY = new Point(e.X, e.Y);
}

private void ScreenSaverForm_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
Close();
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// ScreenSaverForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.BackColor = System.Drawing.Color.Black;
this.ClientSize = new System.Drawing.Size(292, 273);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "ScreenSaverForm";
this.Text = "ScreenSaver";
this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.ScreenSaverForm_KeyDown);
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.OnMouseEvent);
this.Load += new System.EventHandler(this.ScreenSaverForm_Load);
this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.OnMouseEvent);

}
#endregion
}
}