function BindFilterSTaskDt() {
                    BindSTaskDt(TaskCode);
                    var table = $('#tblDesiMaster').DataTable();
                    var filteredData = table
                                               .rows()
                                               .indexes()
                                               .filter(function (value, index) {
                                                   debugger;
                                                   if (table.row(value).data()['STASKQUESTION'] != 1) {STaskId
                                                       offcount++;
                                                   }
                                                   return table.row(value).data()['STASKQUESTION'] != 1;
                                               });
                    table.rows(filteredData)

                    var array = STaskCode.split(',');//STaskCode.val().split(",");//STaskCode.val().split(",");
                    $.each(array, function (i) {
                        $('input[name="chklistitem"][value="' + array[i] + '"]').prop("checked", true);
                    });

                }



var UnitCode: $('#ddlUnit').val(),
var TaskCode: $('#ddlTask').val(),


  if (filteredData !== UnitCode && filteredData !== TaskCode) {}

var TaskCode = $('#ddlTask').val();



-------------------------------------------------------------------------previous code----------------------------------------


$("#ddlTask").change(function () {
                        var TaskCode = $('#ddlTask').val();
                        $("#ddlUnit").val(UnitCode);
                        $("#ddlTask").val(TaskCode);
                        BindSTaskDt(TaskCode);
                        $("STaskId").prop("checked", false); // Uncheck all when page is loaded  
                        var table = $('#tblDesiMaster').DataTable();
                        debugger;
                        var filteredData = table.rows()
                                                   .indexes()
                                                   .filter(function (value, index) {
                                                       debugger;
                                                       if (table.row(value).data()['STaskId'] != 1) {
                                                               offcount++;
                                                               alert("Your selected Task.");
                                                       
                                                           
                                                       }
                                                       return table.row(value).data()['STaskId'] != 1;
                                                   });
                        //table.rows(filteredData)
                        $('#ddlTask').on('change', function () {
                            var selectedValues = this.value;
                            $("STaskId").each(function () {
                                var isChecked = STaskCode.split(',').check($(this).attr("value")) > -1;
                                $(this).prop("checked", isChecked);
                            });
                        });
                    });