Authenticate user with Active Directory

ActiveDirectoryHelper.cs

using System;
using System.Configuration;
using System.DirectoryServices;

namespace StrategicPlans.Helpers
{
    public class ActiveDirectoryHelper
    {
        public string ActiveDirectoryServerPath { get; set; }

        public ActiveDirectoryHelper()
        {
            // read active directory path from AppConfig
            // example   LDAP://serverName
            ActiveDirectoryServerPath = ConfigurationManager.AppSettings["ActiveDirectoryPath"];
        }

        /// <summary>
        /// creates new ActiveDirectoryHelper.
        /// </summary>
        /// <param name="ADPath">active directory server path</param>
        public ActiveDirectoryHelper(string ADPath)
        {
            ActiveDirectoryServerPath = ADPath;
        }

        /// <summary>
        /// authenticates user with active directory
        /// </summary>
        /// <param name="username">active directory username</param>
        /// <param name="password">active directory user's password</param>
        /// <returns></returns>
        public bool IsAuthenticated(string username, string password)
        {
            bool isAuthenticated = false;
            try
            {
                DirectoryEntry de = new DirectoryEntry(ActiveDirectoryServerPath, username, password, AuthenticationTypes.Secure);
                var x = de.Name;
                DirectorySearcher ds = new DirectorySearcher(de);
                var sr = ds.FindOne();

                isAuthenticated = true;
            }
            catch (Exception)
            {
                
            }

            return isAuthenticated;
        }
    }
}