I am trying to learn how to use a database in a C# program!
but I cant connect to the data base

I use
microsoft Sql server 2005
microsoft visual studio 2005
and winXP

what I did is:
from server explorer, I opened the "add connection" page ,
server name = Local,
I browsed for the data base and then clicked on "ok"

but I got the error which is attached to this message.

can you plz tell me what is wrong and what I should do?

thank you