Microsoft's MDSN site is one of the best resources you will find for any .NET questions. Please be sure to check it early and often, as it will more then likely answer your question more thoroughly then we will have the time and energy to do.
There are many important sections of MSDN some of the most helpful are the How-to and Walkthrough sections.
How-to and Walkthrough Directory
For those of you who use Visual Basic 2005 there is a spectacular list of samples that have common code for most of your applications.
101 Samples for Visual Basic 2005
For those who dont have Visual Studio MSDN provides something called virtual labs which allow you to quickly evaluate or learn how to build great applications for Windows and the Web through a series of guided, hands-on labs which can be completed in 90 minutes or less.
MSDN Virtual Labs
If you are confused about exactly what Microsoft's .NET technology is about or what it consists of please refer to this article.
.NET Framework Conceptual Overview
Thanks for looking through all of these links, now you are better prepared to ask your question. Keep in mind, the experts and moderators on this forum expect that you have already searched through these links and visited google as a minimum before posting your question. If you ask a question that is covered by one of these links or can easily be found by running a keyword search on MSDN or Google please do not be upset if no one replies.
Thanks!