Ldapv3 not returning fields which are empty in AD profile

I am trying to run the following code it is working fine but there is an issue.
the issue is it is only those fields which has a value.
All those fields which are empty are not coming.

for example, if in my user in AD has a value in email field then it is coming otherwise not.
I am also giving the code, could any one help me out here.

I am using LDapv3 here


here is the code.
-------------------------------------

  public static void Main(string[] args)
        {
            try
            {
               
               

                //LdapDirectoryIdentifier ldapDir = new LdapDirectoryIdentifier("CBMCC-A8-HPC06", 389);

                LdapDirectoryIdentifier ldapDir = new LdapDirectoryIdentifier("192.168.2.170", 389);
                LdapConnection ldapConn = new LdapConnection(ldapDir);
                //You may need to try different types of Authentication depending on your setup
                ldapConn.AuthType = AuthType.Basic;
                //Update the next line to include the Fully Qualified LDAP name
                // of the user along with that user's password
                System.Net.NetworkCredential myCredentials =
                    new System.Net.NetworkCredential("jet\\administrator", "1nT1meTec");
                ldapConn.SessionOptions.ProtocolVersion = 3;
                //This is the actual Connection establishment here
                ldapConn.Bind(myCredentials);

                Console.WriteLine("LdapConnection is created successfully.");

               

                //Search
                //SearchRequest findme = new SearchRequest("dc=jet,dc=in", "(objectClass=printQueue)", System.DirectoryServices.Protocols.SearchScope.Subtree,"*", "+");

                SearchRequest findme = new SearchRequest("CN=Users;dc=Jet,dc=in", "(objectClass=user)",
                    System.DirectoryServices.Protocols.SearchScope.Subtree, "*", "+");

                //findme.DistinguishedName = "dc=jet,dc=in"; //Find all People in this ou
                //findme.Filter = "(objectClass=user)"; //The type of entry we are looking for
                //findme.Scope = System.DirectoryServices.Protocols.SearchScope.Subtree; //We want all
                //entries below this ou

                SearchResponse results = (SearchResponse)ldapConn.SendRequest(findme); //Run the query

                //and get results
                SearchResultEntryCollection entries = results.Entries;
                List<string> lstAtributes = new List<string>();
                if (entries != null && entries.Count > 0) {
                    SearchResultEntry entry = entries[0];
                    IDictionaryEnumerator attributes = entry.Attributes.GetEnumerator();
                    while (attributes.MoveNext()) {
                        lstAtributes.Add(((DirectoryAttribute)attributes.Value).Name);
                    }
                }
                for (int ii = 0; ii < entries.Count; ii++)//Iterate through the results
                {
                    SearchResultEntry entry = entries[ii];
                    IDictionaryEnumerator attribEnum = entry.Attributes.GetEnumerator();
                    Console.WriteLine("==================================================================");
                    while (attribEnum.MoveNext())//Iterate through the result attributes
                    {
                        //Attributes have one or more values so we iterate through all the values
                        //for each attribute
                        DirectoryAttribute subAttrib = (DirectoryAttribute)attribEnum.Value;
                     
                        for (int ic = 0; ic < subAttrib.Count; ic++)
                        {
                            //Attribute Name below
                            Console.Write(subAttrib.Name + ": ");
                            lstAtributes.Add(subAttrib.Name);
                            //Attribute Sub Value below
                            Console.WriteLine(subAttrib[ic].ToString());
                        }

                    }
                }
               
            }
            catch (Exception e)
            {
                Console.WriteLine("\r\nUnexpected exception occured:\r\n\t" + e.GetType() + ":" + e.Message);
            }
            finally
            {
                Console.ReadLine();
            }
        }