Can you post questions that are not directly related in a more general ASP.NET forum? You find the complete list here: http://p2p.wrox.com/asp-net-4-539/
- How to include an ASP.NET page in many other ASP.NET pages to avoid to rewrite the code
Includes are no longer used in ASP.NET. For presentation related stuff you typically use Master Pages, User Controls and Themes. For code related ,aterial, you can use class files located in App_Code (Web Site Projects) or anywhere else (for Web Application projects)
- How can we programmatically verify whether the UserName and Password is Correct
It depends on where they are stored. If you're using the Membership features, you can use methods on the Membership class. For a custom data store you need to use custom code.
- How to format a Telephone number in the xxx-xxx-xxxx format