Why isn there anything on I/O, or ADO .NET, or (insert related .NET technology here)?
This is a site focused on .NET languages. While site information may touch upon non-language areas when needed (like Remoting, or reflection, or ASP .NET), it’s not meant to be a cornucopia of .NET information. There is a wealth of information on .NET on the Internet – just hit your favorite search site (like Google), and start looking.