Is there a easy way to test Regular Expressions?
There are several tools that allow you to quickly test your regular expressions. Listed below are two that we use: Expresso on CodeProject
How do I read email from a POP server using .NET
Check out this article on Codeproject: POP3 article on Codeproject
How do I send email using .NET
There is a nice and free SMTP component available from Quiksoft. You can read more on this here. Also, check out this article on Codeproject: SMTP article on Codeproject
How do I access an FTP server using .NET
There is an article on CodeProject that has code for a managed component that you can use. FTP component on Codeproject
How can I resize a borderless form with a rubber-band effect
Simon Bond has sample code at C# Corner that implements this sizing technique. Zhanbo Sun suggests a modification that handles a problem he spotted with the original code.