Query With a C# Variable??

Hiya

I was wondering if someone could help me out here, please?
I'm creating a forum, my threads page has the following query:

SELECT * FROM [threads] WHERE ([forum_name] = ?) ORDER BY [time_created] DESC

The "?" (control value) is the sub-forum which the thread is linked to. Example:

List of Forums:
   
    - Introduce Yourself
    - The Lounge
    - Another Thread
    - Blah Blah Blah
  
User
clicks on The Lounge, loads thread.aspx where Query: SELECT * FROM
[threads] WHERE ([forum_name] = ?) ORDER BY [time_created] DESC runs

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