GET system display name, email or directory entry by login user id in C# by Dir DirectorySearcher

GET system display name, email or directory entry by login user id in C# by Dir DirectorySearcher

public class ActiveDirrectory

    {

        public static ADItems GetUserADDetails(string username)

        {

            try

            {

                DirectoryEntry dirEntry = new DirectoryEntry(Constants.LDAP);

                DirectorySearcher search = new DirectorySearcher(dirEntry);

                search.PropertiesToLoad.Add("cn");

                search.PropertiesToLoad.Add("displayName");

                search.PropertiesToLoad.Add("manager");

                search.PropertiesToLoad.Add("mail");

                search.PropertiesToLoad.Add("sAMAccountName");

                if (username.IndexOf('@') > -1)

                {

                    // userprincipal username

                    search.Filter = "(userPrincipalName=" + username + ")";

                }

                else

                {

                    // samaccountname username

                    String samaccount = username;

                    if (username.IndexOf(@"\") > -1)

                    {

                        samaccount = username.Substring(username.IndexOf(@"\") + 1);

                    }

                    search.Filter = "(sAMAccountName=" + samaccount + ")";

                }

                SearchResult result = search.FindOne();

                ADItems obj = new ADItems();

                if (result != null)

                {

                    obj.loginName = username;

                    if (result.Properties["displayName"] != null)

                        obj.displayName = Convert.ToString(result.Properties["displayName"][0]);                   

                    if (result.Properties["mail"] != null)

                        obj.email = Convert.ToString(result.Properties["mail"][0]);

                    if (result.Properties["manager"] != null)

                        obj.manager = Convert.ToString(result.Properties["manager"][0]);

                }

                return obj;

            }

            catch(Exception ex)

            {

                throw ex;

            }

        }

    }

    public class ADItems

    {

        public string loginName { get; set; }

        public string displayName { get; set; }

        public string email { get; set; }

        public string manager { get; set; }

    }