SQL Server 2008 database seems unavailable - visual-studio-2010

Question

I've had this current issue before, and the steps that I've used to resolve it in the past aren't working. I'm working with a database in SSMS, as well as through C#/.NET. When I encounter a bug on the C# side after connecting to the database, the db becomes inaccessible until I close visual studio, and then in prior situations, taking the db offline then on again. I'm looking for more ideas/ help, since after doing those things, a simple query:
SELECT TradeDate, Symbol, Clse
FROM tblDailyPricingAndVol
gives me
Msg 208, Level 16, State 1, Line 1
Invalid object name 'tblDailyPricingAndVol'.
(whereas it is valid, and I type it right after expanding it in object explorer in ssms).
Update:
Running that query with db/ schema prefix as such:
SELECT Market.dbo.TradeDate
FROM Market.dbo.tblDailyPricingAndVol
Returns the error:
Msg 945, Level 14, State 2, Line 1
Database 'Market' cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details.
Running this:
select name, state_desc, user_access_desc, is_read_only from sys.databases
tells me that my db is online. I closed visual studio and restarted my machine last night, then took the db offline then on, and I don't see anything like "recovery pending" etc. today still. I'd like to get back up and running, and if anyone can shed some light on this process of connecting/ disconnecting SQL Server 2008 with Visual Studio 2010, it'd be much appreciated..

Answer 1

A. Make a copy of your Market.mdf file and store it somewhere safe.
B. Run the following commands in a query window:
USE [master];
GO
ALTER DATABASE Market SET SINGLE_USER WITH ROLLBACK IMMEDIATE; -- may fail
GO
DROP DATABASE Market; -- may fail depending on whether this db really exists
GO
CREATE DATABASE Market ON ( FILENAME =
'C:\Program Files\Microsoft SQL Server\MSSQL10_50.SQLEXPRESS\MSSQL\DATA\Market.mdf'
) FOR ATTACH;
GO
If this fails due to some error with the log file (.ldf), then try moving the market.ldf file elsewhere, and running:
CREATE DATABASE Market ON ( FILENAME =
'C:\Program Files\Microsoft SQL Server\MSSQL10_50.SQLEXPRESS\MSSQL\DATA\Market.mdf'
) FOR ATTACH_REBUILD_LOG;
To prevent similar problems in the future:
Don't detach your database.
Don't connect to your MDF file using the AttachDbFileName and User Instance settings.
Don't set your database to OFFLINE.
Don't set your database to Auto-Close.