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"Public Shared Class XYZ" can contain methods that can be accesed without instantiation.

maybe comments :)

This question is wrong ? :)

It is one way encryption. One encryption value may have many decrypting values.

Use a one way encryption. Like MD-5

Connection string exposed in web.config file is accesible in all application clases and can be shared.

You cannot make changes on envirioment of browser what is running your page ...

This is not possible.
You may develop something like timelimiting of an answer ...

This is a CSS issue not ASP.NET

Every control has by def EnabledViewState = true ... it`s preservs it`s value during navigation throug the site

Page-level tracing is enabled ... for all pages

http://www.geekinterview.com/talk/7117-dropdown.html

Use DataSource objects ... Bind the dropdownlist to the datasource ... and the datasource selectmethod should have a parameter bound to a control (e.g. textbox)

You can ovveride Login component Authentificate Event for yourself
something like this ...
protected void login_Authenticate(object sender, AuthenticateEventArgs e)
{
if...

Use ViewState ... How and why find out by yourself ... and check out the Wizard component ...

GET and POST are standart HTML methods of a FORM submitting ...
If you are common with ASP.NET you shoud know that bydef .aspx pages have only one form with attribute runat="server" and bydef...