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I’d like to know how can I intercept packets sent by a certain application and then to check what those packets contain.
I need some advice what to do because I’ve never done such a thing and I want to learn by myself.
Pcap.Net
Pcap.Net is a .NET wrapper for WinPcap written in C++/CLI and C#.
It Features almost all WinPcap features and includes a packet interpretation framework.
SharpPcap
SharpPcap is a cross-platform packet capture framework for the .NET environment, based on the famous pcap / WinPcap libraries. It provides an API for capturing, injecting, analyzing and building packets using any .NET language such as C# and VB.NET.
Comparision of Pcap.Net and SharpPcap
Wireshark
It is used for network troubleshooting, analysis, software and communications protocol development, and education. And I think it is the most versatile packet sniffer I used till now.
Fiddler
Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect traffic, set breakpoints, and "fiddle" with
incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language. Recently Fiddler has been overtook by Telerik. But it is still free AFAIK.