Asp.net - Using Web.Config Active Directory Connection String

I have a connection string (which works fine) to connect to AD through my web application in my web.config. Traditionally, however, I've created a new connection to pull info. from the user after login like so:

Using adDirectory as New DirectoryEntry("LDAP://OU=myou,DC=mydc,DC=dc,DC=com")
Dim adTicketID as String = ticket.Name
myVar = "adDirectory.Children.Find("CN=" & adTicketID).Properties("myproperty").Value
End Using

It seems that I should instead use the connection from the web.config like so:

Using ADCS as New DirectoryEntry
Dim adTicketID as String = ticket.Name
myVar = "adDirectory.Children.Find("CN=" & adTicketID).Properties("myproperty").Value
End Using

Is this possible? How would I accomplish it so that I don't need to constantly create new directoryentries?