C# Pager is a simple client/server application that implements functions of a pager. The source code is released under GPL-2 license for the community. Since C# SDK is still in the form of beta testing, API change in future C# SDK release will probably break this program. Current release is for Microsoft C# SDK beta2 release. This program demonstrates the usage of TCP/IP multi-threading communication technique using C#, windows registry access, hiding application in system tray, context menu for system tray application.