Connect to Active Directory via LDAP

Question

I want to connect to our local Active Directory with C    I ve found this good documentation   But I really don t get how to connect via LDAP   Can somebody of you explain how to use the asked parameters   Sample Code     static DirectoryEntry createDirectoryEntry                   create and return new LDAP connection with desired settings         DirectoryEntry ldapConnection       new DirectoryEntry  rizzo leeds-art ac uk           ldapConnection Path                  LDAP   OU staffusers DC leeds-art DC ac DC uk          ldapConnection AuthenticationType   AuthenticationTypes Secure         return ldapConnection            I just have the Hostname and the IP Address of our Active Directory Server  What does DC xxx DC xx and so on mean

User · Answer

ldapConnection is the server adres  ldap example com Ldap Connection Path is the path inside the ADS that you like to use insert in LDAP format      OU Your OU OU other ou dc example dc com   You start at the deepest OU working back to the root of the AD  then add dc X for every domain section until you have everything including the top level domain  Now i miss a parameter to authenticate  this works the same as the path for the username     CN username OU users DC example DC com   Introduction to LDAP

User · Answer

If your email address is  myname mydomain com   try changing the createDirectoryEntry   as below    XYZ is an optional parameter if it exists in mydomain directory  static DirectoryEntry createDirectoryEntry            create and return new LDAP connection with desired settings     DirectoryEntry ldapConnection   new DirectoryEntry  myname mydomain com        ldapConnection Path    LDAP   OU Users  OU XYZ DC mydomain DC com       ldapConnection AuthenticationType   AuthenticationTypes Secure      return ldapConnection      This will basically check for com -  mydomain   -  XYZ -  Users -  abcd  The main function looks as below   try       username    Firstname LastName      DirectoryEntry myLdapConnection   createDirectoryEntry        DirectorySearcher search   new DirectorySearcher myLdapConnection       search Filter     cn     username

User · Answer

DC is your domain  If you want to connect to the domain example com than your dc s are  DC example DC com  You actually don t need any hostname or ip address of your domain controller  There could be plenty of them     Just imagine that you re connecting to the domain itself  So for connecting to the domain example com you can simply write  DirectoryEntry directoryEntry   new DirectoryEntry  LDAP   example com      And you re done    You can also specify a user and a password used to connect   DirectoryEntry directoryEntry   new DirectoryEntry  LDAP   example com    username    password      Also be sure to always write LDAP in upper case  I had some trouble and strange exceptions until I read somewhere that I should try to write it in upper case and that solved my problems    The directoryEntry Path Property allows you to dive deeper into your domain  So if you want to search a user in a specific OU  Organizational Unit  you can set it there    DirectoryEntry directoryEntry   new DirectoryEntry  LDAP   example com    directoryEntry Path    LDAP   OU Specific Users OU All Users OU Users DC example DC com     This would match the following AD hierarchy    com   example   Users   All Users   Specific Users       Simply write the hierarchy from deepest to highest    Now you can do plenty of things  For example search a user by account name and get the user s surname   DirectoryEntry directoryEntry   new DirectoryEntry  LDAP   example com    DirectorySearcher searcher   new DirectorySearcher directoryEntry        PageSize   int MaxValue      Filter      amp  objectCategory person  objectClass user  sAMAccountName AnAccountName        searcher PropertiesToLoad Add  sn     var result   searcher FindOne     if  result    null        return     Or whatever you need to do in this case    string surname   if  result Properties Contains  sn          surname   result Properties  sn   0  ToString

[c#] Connect to Active Directory via LDAP

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