Do you remember the connection string I gave you in your previous post "Need Help"?
Try using that one instead.
If I recall correctly, the constant DATA_SOURCE already contains "data source=JAKE-PC\SQLEXPRESS", so what you have done in your StingBuilder is declare the data source twice.
It's redundant, and causes errors.
And, the format of your connection string is targeted towards MSSQL 2005/2008.
Try using "Integrated Security=SSPI" instead of "trusted_connection=yes;".