Your question is too general. What specifically are you having trouble with? What error messages are you getting? What code are you using? We can't help you if you just tell us something is broken. We aren't there to see what you see.
From the subject line of your question, it sounds like you need help building a connection string. There is a great resource out there that can help you with that....
http://www.connectionstrings.com/[
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If this isn't what you need help with, please provide more information about your problem.