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

                    var ischecked = false;

                    for (var j = 0; j < jsonarg1.length; j++) {

                        console.info(jsonarg1[j]["Tag_ID"] + "----" + jsonmsg[i]["TabId"]);

                        if (jsonarg1[j]["Tag_ID"] === jsonmsg[i]["TabId"]) {

                            ischecked = true;

                        }

                    }

                    $("#ModalList").append("<input type='checkbox' name='TagName' " + (ischecked === true ? "checked='checked'" : "") + "  value='" + jsonmsg[i]["TabId"] + "' />" + jsonmsg[i]["Names"]);

                }

 @{

                foreach (IAMS.DATASERVICE.JiaoBao.SSchedule.Model.Schedule_Tag t in taginfolist)

                {

                    var ischecked = false;

                    foreach (IAMS.DATASERVICE.JiaoBao.SSchedule.Model.Schedule_Tag_Info ti in tagidlist)

                    {

                        if (t.TabId == ti.Tag_ID)

                        {

                            ischecked = true;

                        }

                    }

                <input type="checkbox"  name="TagIDs" value="@t.TabId" checked="@ischecked"  /> @t.Names

                }

            }