AD帳號登錄驗證

using System.DirectoryServices;

    /// <summary>
    /// AD帳號登錄驗證
    /// </summary>
    /// <param name="UserName">AD用戶名</param>
    /// <param name="PassWord">AD密碼</param>
    /// <param name="strOU">active directory 中的組織單位</param>
    /// <returns></returns>
    public bool Login(string UserName, string PassWord, string strOU)
    {
        String strPath = string.Format("LDAP://OU={0},OU=ZYE,DC=zhanyun,DC=com,DC=cn", strOU);
        DirectoryEntry AD = new DirectoryEntry(strPath);
        AD.Username = "zhanyun" + @"\" + UserName;
        AD.Password = PassWord;
        try
        {
            DirectorySearcher searcher = new DirectorySearcher(AD);
            searcher.Filter = String.Format("(sAMAccountName={0})", UserName);
            System.DirectoryServices.SearchResult result = searcher.FindOne();
            if (result == null)
            {
                return false;
            }
            AD.Close();
        }
        catch
        {
            return false;
        }
        finally
        {
            AD.Close();
        }

        return true;
    }

bool result = Login(username, password, "MIS");