Here are some resources for further study:

Web: http://msdn.microsoft.com This web site should be your first stop for any questions or for code examples, an invaluable resource.

Books:

• C#
  • C# in a Nutshell (2nd Edition) by Peter Drayton, et. al. (O'Reilly Press) – Good overview of the language and the more popular API calls.
  • C# and the .Net Platform (2nd Edition) by Andrew Troelson 2nd (APress) – Excellent text for learning the syntax of C# and how to call into the framework.
  • Programming C#(3rd Edition) - Jesse Liberty (O'Reilly Press) – Another good resource for learning C#.
    
• ASP.Net:
  • Programming ASP .Net by Jesse Liberty et. al. (O'Reilly Press) – Covers ASP.Net development with examples in both C# and VB.Net.
    
• General .Net:
  
  • Introducing Microsoft .Net (3rd Edition)  by David S. Platt (Microsoft Press) – Good introduction to .Net
    
• Web Services:
  • .Net Web Services by Keith Ballinger (Addison-Wesley) – Authoritative guide on creating web services from the Microsoft Program Manager for XML Web Services.
  • C# Web Services by Ashish Banerjee et. al. (Wrox Press) – Good book covering Web Service development with some .Net remoting and ASP.Net thrown in.