I want to develop a C# Web Base Logon to connect a Novell LDAP Server with
SSL and then authorize the AD Domain User Name and Password

I have written the following source code to make a connection to Novell LDAP
Server, but i do not know how to authorize AD User Name and Password. And
can it connect to Novell LDAP?

Here are my source code:

   public class LdapAuthentication
   {
       private string _path;
       private string _filterAttribute;

       public LdapAuthentication(string path)
       {
           _path = path;
       }

       public bool IsAuthenticated(string domain, string username, string
pwd)
       {

           DirectoryEntry entry = new DirectoryEntry(_path, username, pwd);

           try
           {
               //Bind to the native AdsObject to force authentication.
               object obj = entry.NativeObject;

               DirectorySearcher search = new DirectorySearcher(entry);

               search.Filter = "(SAMAccountName=" + username + ")";
               search.PropertiesToLoad.Add("cn");
               SearchResult result = search.FindOne();

               if (null == result)
               {
                   return false;
               }

               //Update the new path to the user in the directory.
               _path = result.Path;
               _filterAttribute = (string)result.Properties["cn"][0];
           }
           catch (Exception ex)
           {
               throw new Exception("Error authenticating user. " +
ex.Message);
           }

           return true;
       }

       public string GetGroups()
       {
           DirectorySearcher search = new DirectorySearcher(_path);
           search.Filter = "(cn=" + _filterAttribute + ")";
           search.PropertiesToLoad.Add("memberOf");
           StringBuilder groupNames = new StringBuilder();

           try
           {
               SearchResult result = search.FindOne();
               int propertyCount = result.Properties["memberOf"].Count;
               string dn;
               int equalsIndex, commaIndex;

               for (int propertyCounter = 0; propertyCounter <
propertyCount; propertyCounter++)
               {
                   dn =
(string)result.Properties["memberOf"][propertyCounter];
                   equalsIndex = dn.IndexOf("=", 1);
                   commaIndex = dn.IndexOf(",", 1);
                   if (-1 == equalsIndex)
                   {
                       return null;
                   }
                   groupNames.Append(dn.Substring((equalsIndex + 1),
(commaIndex - equalsIndex) - 1));
                   groupNames.Append("|");
               }
           }
           catch (Exception ex)
           {
               throw new Exception("Error obtaining group names. " +
ex.Message);
           }
           return groupNames.ToString();
       }
   }

===========================================================================================================================================

string adPath = "LDAP://ldap.abc.com:636/ou=Users,o=AUTH";

LdapAuthentication adAuth = new LdapAuthentication(adPath);

if (true == adAuth.IsAuthenticated("ad.abc.com", "cn=TVAT,ou=eSERV,o=AUTH",
"123456789"))
{
     string groups = adAuth.GetGroups();

     //Create the ticket, and add the groups.
     bool isCookiePersistent = true;
     FormsAuthenticationTicket authTicket = new
FormsAuthenticationTicket(1, "UserNameHERE", DateTime.Now,
DateTime.Now.AddMinutes(60), isCookiePersistent, groups);

     //Encrypt the ticket.
     Create a cookie, and then add the encrypted ticket to the cookie as
data.
     HttpCookie authCookie = new
HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket);

     if (true == isCookiePersistent)
           authCookie.Expires = authTicket.Expiration;

     //Add the cookie to the outgoing cookies collection.
     Response.Cookies.Add(authCookie);

     Response.Redirect("urlHERE");
}
else
{
      Message.Text = "Authentication did not succeed. Check user name and
password.";

      return;
}