How do I retrieve e-mail address associated with a DL from Active Directory?

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VB

active-directory

Hello,

Am writing a vb.net code where I want to retrieve the email address associated with a Distribution list (not the email addresses mapped in the DL).

For example, if there is a DL named ABC-Support and its associated mail id is ABC-Support@example.com. In my application when a user types the name "ABC-Support" in the text box, it should retrieve the mail address "ABC-Support@example.com"

Am able to do the search for any username, but while trying for DL name it is not working. Maybe am missing something simple. Can someone please help me with this?

deActiveDirectoryEntry = New DirectoryEntry("GC://RootDSE")
            dsAuthenticateDirectorEntry = New DirectoryEntry(String.Concat("GC://", deActiveDirectoryEntry.Properties("rootDomainNamingContext").Value.ToString()))
            dsSearchDir = New DirectorySearcher(dsAuthenticateDirectorEntry)
            dsSearchDir.Filter = "(&(objectClass=user)(|(displayName=" + strPRID + ") (distinguishedName=" + strPRID + ")))"
            dsSearchDir.PropertiesToLoad.Add("mail")
            srResultValue = dsSearchDir.FindOne()

            usermail = srResultValue.Properties("mail")(0)