If you are unable to find a free Modbus Slave simulator, here is one.
Latest TCP/IP Articles - Page 2
Speeding Up Internet Browsing
This program watches for DNS requests, lists them, and allows you to save them to block certain sites.
Creating a TCP Ping Echo on User-Defined Protocols
TCP Ping is necessary when measuring server functionality from different IP networks (mirror sites).
Raw TCP/IP library for Windows 2000
Updated to version 4. This library enumarates the TCP/IP protocol, and allows the user to create custom TCP/IP headers, this allows IP spoofing and more.
Networked Simulated Plants Using Modbus/TCP
Networked Simulated Plants (NSP) is a frame program that connects a Modbus/TCP server with a automation simulation. It delivers Ethernet I/O to programmable logic controllers (PLCs).
How to write a simple but effective TCP/IP port scanner for Win32
Learn how to develop a simple but effective port scanner for Win32, using a self written socket classes (not the CSocket which comes with MFC) and a small framework based on the CPropertySheet/CPropertyPage classes.
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MFC Integration with the Windows Transactional File System (TxF)
The Transactional File System (TxF), which allows access to an NTFS file system to be conducted in a transacted manner through extensions to the Windows SDK API. MFC 10, has been extended to support TxF and related technologies. This support allows existing MFC applications to be easily extended to support kernel transactions.
.NET Framework: Collections and Generics
The original release of the .NET Framework included collections as .NET was introduced to the Microsoft programming world. The .NET Framework 2.0 introduced generics to complement the System.Collections namespace and provide a more efficient and well performing option. Read on to learn more...

How to use Visual Studio 2012 to Download Images from Websites
Learn how to use a for loop to loop through all of the images found on a web page and save them via the DownloadFile method of the WebClient object.

SOLID Principles in C# - An Overview
SOLID principles form the base for writing good and clean object oriented code in C#. Learn about the S.O.L.I.D principles and explore C# coding samples for each.
