Disable Datepicker dates based on database list using JQUERY

To disable datapicker date getting from db shown below

Getting dates list from db using ajax call

  $(document).ready(function () {

            $("#ContentPlaceHolder_Body_ddlBlock").change(function () {

                getdates();

            });

            var holidays;

            function getdates() {

                $.ajax({

                    type: "POST",

                    url: "Dates.aspx/GetDatesArray",

                    data: '',

                    dataType: "json",

                    contentType: "application/json; charset=utf-8",

                    success: function (data) {

                        holidays = data.d;

                        localStorage.setItem("Holidays", holidays);

                    },

                });

            }

            var holidaysList = localStorage.getItem("Holidays");

            if (holidaysList != null && holidaysList != "") {

             var holidays = holidaysList.toString().split(',');

                $("# txtDate").datepicker({

                    changeMonth: true,

                    changeYear: true,

                    dateFormat: 'yy-mm-dd',

                    beforeShowDay: function (date) {

                        show = true;

                        if (date.getDay() == 0) { show = false; }//No Weekends

                        for (var i = 0; i < holidays.length; i++) {

                            if (new Date(holidays[i]).toString() == date.toString()) { show = false; }//No Holidays

                        }

                        var display = [show, '', (show) ? '' : 'No Weekends or Holidays'];//With Fancy hover tooltip!

                        return display;

                    }

                });

            }

            else {

                getdates();

            }

        });

webmethod in .cs file

[WebMethod]

        public static List<string> GetDatesArray()

        {

            string consString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

            try

            {

                DataSet Sqlds = new DataSet();

                using (SqlConnection sqlCon = new SqlConnection(consString))

                {

                    using (SqlCommand sqlCmd = new SqlCommand("select * from table", sqlCon))

                    {

                        SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);

                        sqlDa.Fill(Sqlds);

                    }

                }

                List<string> strPH = new List<string>();

                foreach (DataRow row in Sqlds.Tables[0].Rows)

                {

                    DateTime Dt = Convert.ToDateTime(row["d"].ToString());

                    //strPH.Add(String.Format("{0:MM/dd/yyyy}", Dt));

                    strPH.Add((Dt.ToString("M/d/yyyy")).Replace("-", "/"));

                }

                return strPH;

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }