looking articles and source code related to agile process that is implemented in asp.net
The wikipedia article is a good start: http://en.wikipedia.org/wiki/Agile_software_development
Agile is about process and management. The resulting code could be said to be agile if it is easy to maintain but it is more a side effect of using agile methodologies. As a consequence you can't find code examples related to agile process. Also, agile is not bound to any specific language of framework, it is about process.
In general it is not really useful if you're not part of a team and it seems like a lot of good practices are emerging from that.
Also keep in mind that software development is quite disturbed by various ideologies. Never pick one as a holy grail.
Agile covers a massive area, so what particular part interests you?
I'm guessing it's not 'User Stories' or the project management aspect, as you are asking about ASP.NET. Also, I'm not sure why pair programming techniques specific to ASP.NET would be different to non-ASP.NET. So is it some examples of Test Driven Development (TDD) or something like that that you would like to see?
I would start with SCRUM and Test Driven Development (TDD) and then branch into other areas of agile as time, interest and need dictate. These two techniques are established methodologies widely used in large enterprises and small organizations. They will give you a good start in the agile world and there is a reasonably good chance of being able to using them.
SCRUM: http://www.controlchaos.com/resources/
TDD: Read the book "Test Drive Development: By Example", by Ken Beck