Does End Using close an open SQL Connection

Question

If I wrap a SQLConnection in a Using, should I close it or does the end using handle it?

using cn as new system.data.sqlclient.sqlconnection()
    cn.open
           


        

Answer 1

"A Using block behaves like a Try...Finally construction in which the Try block uses the resources and the Finally block disposes of them. Because of this, the Using block guarantees disposal of the resources, no matter how you exit the block. This is true even in the case of an unhandled exception, except for a StackOverflowException."
https://msdn.microsoft.com/en-us/library/htd05whh.aspx