Here the feed back matter on your requirement..
as per your requirement you can add fileds to display on page.
NORMAL WAY..
There are many site use this type of feed back form..
1)Name //text box single line
2)email_id //text box single line
3)suggestion/feedback //text box single Multiline
4)Submit button
while user will fill all that detail and click on submit button at that time one server side method for sending email will called and as per the content it will send a mail to admin for suggestion or feedback..
for how to sending mail you can see this link
How to send A E-Mail From Your ASP.NET web Application...?[
^]
and if u don't want to send email, forget that. simply save data to the database on button click.