vb.net and ldap authentication

I currently have a program that queries ldap.  I need to be able to change it over to multiple domains.  I use the below for authentication.  How can i default the username and password to be the current logged in credentials cache?

Dim de As New DirectoryEntry("LDAP://bkng.net:389/DC=bkng,DC=net")
            de.Username = "johndoe"
            de.Password = "password"

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How do i use CredentialCache.DefaultCredentials???
derek7467Asked:
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
Probably this microsoft article helps you to use AD authentication in vb.net.

http://support.microsoft.com/kb/326340 

or

Read this will help with your question : http://support.microsoft.com/kb/813834

Reference :
Here is the actual credentialcache.defaultcredentails usage from MSDN library :
http://msdn.microsoft.com/en-us/library/system.net.credentialcache.defaultcredentials(v=vs.110).aspx?cs-save-lang=1&cs-lang=vb#code-snippet-1
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Chris DentPowerShell DeveloperCommented:
If you wish to use current credentials simply don't bother supplying credentials at all (it will default to binding with the current users credentials).

i.e.
Dim de as New DirectoryEntry("LDAP://bkng")

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Or, better still, use serverless binding:
Dim de as New DirectoryEntry()

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Chris
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derek7467Author Commented:
didn't realize I was doing this now and could just addin another form for secondary login information if  needed.  Thanks!
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