[WebMethod]
        public static string ChkLDAP(string Username, string Password)
        {
            InizializzaLdap();
            string rst = "";
            string sesso = "";
            string adm = "";
            string searchString = psearchString;
            string param = pparam;
            bool trovato = false;
            //string tmpUser, tmpPass;

            SearchRequest searchRequest = null;
            SearchResponse searchResponse = null;
            LdapConnection connection = null;
            //LDAP disattivo
            if ((!auth.Equals("si")) && (!auth.Equals("true")))
            {
                string rsout = ChkAdmin(Username, Password);
                return rsout;
            }
            //LDAP attivo
            for (int i = 0; i < ldap.Count; i++)
            {
                if (ldap[i].InnerText.Length > 0)
                {
                    NetworkCredential credential = new NetworkCredential(Username, Password);
                    LdapDirectoryIdentifier serverId = new LdapDirectoryIdentifier(ldap[i].InnerText);
                    connection = new LdapConnection(serverId, credential);
                    //connection.AuthType = AuthType.;
                    //Uso LDAP semplice
                    if ((!pauthOpen.Equals("si")) && (!pauthOpen.Equals("true")))
                    {
                        try {
                            connection.Bind();
                            trovato = true;
                        }
                        catch (Exception exc)
                        {
                            if (i == ldap.Count - 1)
                            {
                                string rsout = ChkAdmin(Username, Password);
                                return rsout;
                            }
                            else continue;
                        }

                        adm = "\"admin\":" + ChkAdmin(Username, Password);
                        break;
                    }
                    //Uso LDAP open
                    else
                    {
                        searchRequest = new SearchRequest(
                            searchString, (string)null, System.DirectoryServices.Protocols.SearchScope.Subtree, (string[])null);

                        try
                        {

                            searchResponse = (SearchResponse)connection.SendRequest(searchRequest);
                            foreach (SearchResultEntry entry in searchResponse.Entries)
                            {
                                String[] substrings = entry.DistinguishedName.Split(',');
                                if (substrings[0].Equals(param + "=" + Username) || substrings[0].Equals("CN=" + Username))
                                {
                                    trovato = true;
                                    break;
                                }
                            }


                        }
                        catch (Exception exc)
                        {
                            if (i == ldap.Count - 1)
                            {
                                //return (exc.Message);
                                string rsout = ChkAdmin(Username, Password);
                                return rsout;
                            }
                            else continue;
                        }

                        adm = "\"admin\":" + ChkAdmin(Username, Password);
                        break;
                    }
                }
                else continue;
            }
            if (trovato == false)
            {
                string rsout = "{\"users\":\"\"";
                rsout += "," + adm + "}";
                //con.Close();
                return rsout;
            }
            SqlConnection con = new SqlConnection(conndb);
            con.Open();
            string sql = "SELECT A.ENTE,A.NOME,A.COGNOME,A.CODFISC,A.WEBUSER,A.WEBPASSWORD,A.POSIZIONE,A.WEBACCESS,A.SESSO,E.DENOMINAZIONE FROM ANAGDIP A INNER JOIN ENTI E ON A.ENTE = E.CODICE WHERE A.UTENTELDAP = @Username";
            SqlCommand cmd = new SqlCommand(sql, con);
            cmd.Parameters.AddWithValue("Username", Username);
            SqlDataReader dr = cmd.ExecuteReader();
            DataTable dt = new DataTable();
            dt.Load(dr);
            if (dt.Rows.Count > 0)
            {
                for (int j = 0; j < dt.Rows.Count; j++)
                {
                    for (int k = 0; k < dt.Rows.Count; k++)
                    {
                        if (!(dt.Rows[k]["CODFISC"].Equals(dt.Rows[j]["CODFISC"])))
                        {
                            rst = "3";
                            string rsout = "{\"result\":\"" + rst + "\"}";
                            con.Close();
                            return rsout;
                        }
                    }
                }

                string rs = "{\"users\":[";
                rst = "0";
                foreach (DataRow row in dt.Rows)
                {
                    if (row["WEBACCESS"].ToString() == "0")
                    {
                        continue;
                    }
                    if (getCodContr(row["ENTE"].ToString()) == false)
                    {
                        continue;
                    }
                    if (row["POSIZIONE"].ToString() == "99")
                    {
                        continue;
                    }
                    if (!rs.Equals("{\"users\":["))
                    {
                        rs += ",";
                    }
                    if (row["SESSO"].ToString() == "1") { sesso = "a"; }
                    else if (row["SESSO"].ToString() == "0") { sesso = "o"; }

                    rs += "{\"result\":\"" + rst + "\", \"NOME\":\"" + row["NOME"].ToString().Replace("\"", "\\\"") + "\", \"COGNOME\":\"" + row["COGNOME"].ToString().Replace("\"", "\\\"") + "\", \"CODFISC\":\"" + row["CODFISC"].ToString().Replace("\"", "\\\"") + "\", \"WEBUSER\":\"" + row["WEBUSER"].ToString().Replace("\"", "\\\"") + "\", \"WEBPASSWORD\":\"" + KDeCripta(row["WEBPASSWORD"].ToString().Replace("\"", "\\\"")) + "\", \"SESSO\":\"" + sesso + "\", \"DENOMINAZIONE\":\"" + row["DENOMINAZIONE"].ToString().Replace("\"", "\\\"") + "\", \"ENTE\":\"" + row["ENTE"].ToString().Replace("\"", "\\\"") + "\"}";
                }
                rs += "],";
                rs += adm + "}";
                rst = "0";
                con.Close();
                return rs;
            }
/*                else
                {
                    string ldapUser = dt.Rows[0]["WEBUSER"].ToString();
                    string ldapPass = KDeCripta(dt.Rows[0]["WEBPASSWORD"].ToString());

                    string rsout = "{\"users\":" + ChkUser(ldapUser, ldapPass, false);
                    rsout += "," + adm + "}";
                    con.Close();
                    return rsout;
                    //if (!String.IsNullOrEmpty(rsout))
                    //{
                    //    rst = "0";
                    //    con.Close();
                    //    return rsout;
                    //}
                    //else
                    //{
                    //    rst = "1";
                    //    string rs3 = "{\"result\":\"" + rst + "\"}";
                    //    con.Close();
                    //    return (rs3);
                    //}
                }
            */
            else
            {
                //rst = "1";
                //string rs3 = "{\"result\":\"" + rst + "\"}";
                //con.Close();
                //return (rs3);
                string rsout = "{\"users\":\"\"";
                rsout += "," + adm + "}";
                con.Close();
                return rsout;
            }

            //object connected = null;

            //DirectoryEntry root = new DirectoryEntry("aLDAP://pgmserver", Username, Password);

            //try
            //{
            //    connected = root.NativeObject;
            //}
            //catch (Exception ex)
            //{
            //    string rsout = ChkAdmin(Username, Password);
            //    return rsout;
            //}

            //SqlConnection con = new SqlConnection(conndb);
            //con.Open();
            //string sql = "SELECT WEBUSER,WEBPASSWORD FROM ANAGDIP WHERE UTENTELDAP = " + Username;
            //SqlCommand cmd = new SqlCommand(sql, con);
            //cmd.Parameters.AddWithValue("Username", Username);
            //SqlDataReader dr = cmd.ExecuteReader();

            //// Admin presente
            //if (dr.HasRows == true)
            //{
            //    dr.Read();
            //    string ldapUser = dr["WEBUSER"].ToString();
            //    string ldapPass = dr["WEBPASSWORD"].ToString();

            //    string rsout = ChkUser(ldapUser, ldapPass);
            //    if (!String.IsNullOrEmpty(rsout))
            //    {
            //        rst = "0";
            //        return rsout;
            //    }
            //    else
            //    {
            //        rst = "1";
            //        string rs3 = "{\"result\":\"" + rst + "\"}";
            //        con.Close();
            //        return (rs3);
            //    }
            //}
            //else
            //{
            //    rst = "1";
            //    string rs3 = "{\"result\":\"" + rst + "\"}";
            //    con.Close();
            //    return (rs3);
            //}
        }