I have given many interviews on c#,asp.net jobs and
went through the questions.here i am posting,It may
help you -

command objects use parameters for passing values
to sql statements for type cheking,validation,guarding
against SQL injection attacks,etc.so its a good practice
to use command parameters to sql statements.

when you run asp.net application project from visual
studio,visual studio uses their development server.
It's not the right way to develop asp.net appication.

you may want to show dynamic data from a page when
mouse is placed over a button.

master pages creates a common look in your application.
if we think about the header and footer in our pages,we
create these header and footer in every aspx pages.this
method has disadvantages.if there were any custom page
which dynamically adds header and footer then would be
good.