C # uses AD (Active Directory) to authenticate the intranet user name password

1. Connect to the intranet and find the domain address of the ad
Nslookup
Set Types=all
_ldap._tcp
2. Verifying the functions of the ad

public bool ADLogin(string userName, string password)
        {
            // sample :
            // LDAP://xxx.com
            string domain = System.Configuration.ConfigurationManager.AppSettings["AD_Domain"];
            
            try
            {
                DirectoryEntry entry = new DirectoryEntry(domain, userName, password);
                object obj = entry.NativeObject;
                DirectorySearcher search = new DirectorySearcher(entry);
                search.Filter = string.Format("(SAMAccountName={0})", userName);
                search.PropertiesToLoad.Add("cn");


                SearchResult result = search.FindOne();
                if (result == null)
                    return false;
            }
            catch (Exception ex)
            {
                log.Error(ex);
                return false;
            }


            return true;
        }

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