Never Use Sql Connection's Global Object

Never Use sqlConnection's global object in class.because it's create too much problem.it may crash the system.i really face this Issue.for Complete Issue Please see below link.

http://social.msdn.microsoft.com/Forums/en-US/sqldataaccess/thread/9793b998-3319-40e0-b4ef-5d5d8a10cfd8