>It's a bad idea to use reserved words as object names in SQL Server. You'll have to enclose them in delimiters [] every time you use them.
>
>>(Actually the version is server 2008 r2 express)
>>
>>I am working with Dotnetnuke (DNN) 505. On a brand new install my database file ended up being named database.mdf)
>>(by default I think?). I did the install on my local win 7 machine. I also installed sql management studio. (However the management studio won't start - but, I think, that is a separate issue).
>>
>>I got the install up and running and the DNN website going - but I never bothered to check out the details of the database because my management studio wasn't working. Then I used management studio on another machine to find the sql server database - but I couldn't find it. But I know that (well... pretty sure) that there is a database called database.mdf up and running on the machine.
>>Logged in as administrator on the account and as sa. If I try to do an "attach database of database.mdf" it says that it is in use by another process. My web.config file is pasted below.
>>
>>If I attempt the command "use database", I get "syntax error near the keyword database". Is it a problem that the database name is a keyword?
>>

I'm unable to access the original message, so the answer is to David - take a look at this blog post:
Don't use Invalid characters (and reserved words) in your database object names