c# Create custom exception

  public class CertNotValidException : Exception
    {
        public CertNotValidException()
            : base() { }
 
        public CertNotValidException(string message)
            : base(message) { }
 
        public CertNotValidException(string format, params object[] args)
            : base(string.Format(format, args)) { }
 
        public CertNotValidException(string message, Exception innerException)
            : base(message, innerException) { }
 
        public CertNotValidException(string format, Exception innerException, params object[] args)
            : base(string.Format(format, args), innerException) { }
    }

Jquery UI Dialog

    $("#dialog").dialog({
        autoOpen: false,
        height: 500,
        width: 960
    });
 
$("#dialog").dialog("open");

<div id="dialog" title="Dialog title"></div>

ASP NET MVC JQuery table with ajax refresh

       var oProtocolTable = $('#ProtocolTable').DataTable({
        "bPaginate": false,
        "ordering": false,
        "bFilter": false,
        "bInfo": false,
        "bProcessing": true,
        "bLengthChange": false,
        "ajax": "/Home/ProtocolAjaxHandler",
        "language": {
            "url": "Content/Russian.txt"
        },
        "fnServerParams": function (aoData) {
            aoData.push({ "name": "GroupID", "value": GroupID });
            aoData.push({ "name": "OrgInn", "value": orgINN });
            aoData.push({ "name": "check_id", "value": check_id });
        }
    });
 
    $('#OrganisationRisk tbody').on('click', 'tr', function () {
        check_id = oOrganisationRisk.cell(this, 0).data();
        oProtocolTable.ajax.reload();
    });

 /// <summary>
    /// Class that encapsulates most common parameters sent by DataTables plugin
    /// </summary>
    public class JQueryDataTableParamModel
    {
        /// <summary>
        /// Request sequence number sent by DataTable, same value must be returned in response
        /// </summary>       
        public string sEcho{ get; set; }
 
        /// <summary>
        /// Text used for filtering
        /// </summary>
        public string sSearch{ get; set; }
 
        /// <summary>
        /// Number of records that should be shown in table
        /// </summary>
        public int iDisplayLength{ get; set; }
 
        /// <summary>
        /// First record that should be shown(used for paging)
        /// </summary>
        public int iDisplayStart{ get; set; }
 
        /// <summary>
        /// Number of columns in table
        /// </summary>
        public int iColumns{ get; set; }
 
        /// <summary>
        /// Number of columns that are used in sorting
        /// </summary>
        public int iSortingCols{ get; set; }
 
        /// <summary>
        /// Comma separated list of column names
        /// </summary>
        public string sColumns{ get; set; }
 
    }

  public ActionResult ProtocolAjaxHandler(JQueryDataTableParamModel param, int? GroupID, string OrgInn, int? check_id)
        {
            var riski = RiskiRepository.Show_Protocol(OrgInn ?? "", GroupID ?? 0, check_id ?? 0);
            if (riski == null)
                return Json(new
                {
                    data = new List<string>()
                },
                JsonRequestBehavior.AllowGet);
            return Json(new
            {
                aaData = from emp in riski
                         select new[] { emp.description, emp.date_check.ToShortDateString() }
 
            },
            JsonRequestBehavior.AllowGet);
 
        }

ASP NET MVC JQUERY send ajax request and get results

var ooData = { GroupID: GroupID, OrgInn: orgINN, check_id: oOrganisationRisk.cell(this, 0).data() };
var jqxhr = $.post("/Home/ProtocolAjaxHandler", ooData, function (data) {
var ss = "";
$.each(data, function (i) {
  ss = ss + "<tr><td>" + this.description + "</td><td>" + this.date_check + "</td></tr>";
  });
$("#ProtocolTable").html(ss);

        [HttpPost]
        public ActionResult ProtocolAjaxHandler(ProtocolPost _param)
        {
            var riski = RiskiRepository.Show_Protocol(_param.OrgInn ?? "", _param.GroupID ?? 0, _param.check_id ?? 0);
            return Json(riski);
        }

        public class ProtocolPost
        {
            public string OrgInn {get;set;}
            public int? GroupID { get; set; }
            public int? check_id { get; set; }
        }

microsoft source code

http://referencesource.microsoft.com/

ASP NET JQuery Table with refreshing content

http://www.codeproject.com/Articles/177335/Refreshing-content-of-the-table-using-AJAX-in-ASP

https://evolpin.wordpress.com/2011/04/12/asp-net-mvc-partialview-with-ajax/
simple example of jquery ajax mvc

c# timer without timer

public void OnStart()
{
    _stop.Reset();
    _registeredWait = ThreadPool.RegisterWaitForSingleObject(_stop, 
        new WaitOrTimerCallback(PeriodicProcess), null, 5000, false);
}

public void OnStop()
{
    _stop.Set();
}

private void PeriodicProcess(object state, bool timeout)
{
    if (timeout)
    {
        // Periodic processing here
    }
    else
        // Stop any more events coming along
        _registeredWait.Unregister(null);
}

private ManualResetEvent _stop = new ManualResetEvent(false);
private RegisteredWaitHandle _registeredWait;

//It's the method for periodically calling some methothds without using Timers. I think it is more elegant solution for this.

//Waiting process works in separate thread pool. Calling method works in main thread. Be carefull with that.