How to get the list of domains from LDAP using VB.NET ?

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VB

LDAP

domain

Hello,

I am new to programming(VB.NET) and need help to get list of all Domain names from LDAP from my project.
I am able to retrieve other details like First Name, Surname, Mail, etc...but cant get domain names. I tried many options online but none worked for me. I just need the list of domains so I can loop it further and continue with other process.
Help would be much appreciated.

Best Regards.

What I have tried:

I have used the below code to match other details Environment.UserDomainName gives me my domain, but I need domain for other users as well.

dirEntry = New System.DirectoryServices.DirectoryEntry("LDAP://" & " & Environment.UserDomainName & ")
dirSearcher = New System.DirectoryServices.DirectorySearcher(dirEntry)
dirSearcher.Filter = "(samAccountName= " & txt_Usr_ID.Text & ")"
dirSearcher.PropertiesToLoad.Add("GivenName")
dirSearcher.PropertiesToLoad.Add("sn")
dirSearcher.PropertiesToLoad.Add("mail")
Str_Searchres = dirSearcher.FindOne()
Dir_direntry = Str_Searchres.GetDirectoryEntry()
Str_Usr_ID = txt_Usr_ID.Text
Str_Fname = Dir_direntry.Properties("GivenName").Value.ToString()
Str_Lname = Dir_direntry.Properties("sn").Value.ToString()
Str_Mail = Dir_direntry.Properties("mail").Value.ToString()