Ajax is not working (It gives internal server error).

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ASP.NET

Ajax

MVC

hello guys,

i have one ajax function and into that i want bind html data with respect to result but problem is ...after i click button it goes to the post method and return
j- son object but coming to browser side it will gives internal server error (500)

i am really confuse that all the thing i put well even if it gives me this type of error

i put my code below

////Ajax function 

function ScrollDiv() {

              var st = $(this).scrollTop();
              var divScroll = false;
              if ($("#divGridCont").scrollTop() >= $("#grdLeadQueue").height() - $("#divGridCont").height() && divScroll == false) {
                  if (st >= lastScrollTop) {
                      divScroll = true;
                      var InnerHtml;
                      var vNxtCount = NxtCount;
                      var Search;
                      if (document.getElementById("txtSearch").value != "Enter your search here...") {
                          Search = document.getElementById("txtSearch").value.replace(/\s/g, encodeURIComponent(' '));
                      }
                      else {
                          Search = "";
                      }
                      var ParamData = { Searchstr: Search, NextCount: vNxtCount }
                      $.ajax({
                          url: '/Settings/TagSettings?NextCount=' + vNxtCount+'&Searchstr=' + Search,
                          dataType: "json",
                          type: "get",
                          contentType: 'application/json; charset=utf-8',
                          async: true,
                          success: function (result) {


                              $.each(result.Listfortag, function (j, dval)
                              {

                               var Tagname = dval.toString().split(",");
                               InnerHtml += "<tr>";
                               InnerHtml += "<td>" + Tagname[1] + "</td>";
                               InnerHtml += "<td>" + Tagname[2] + "</td>";
                               InnerHtml += "<td class=\"alignAction\">";
                               InnerHtml += "<a>";
                               InnerHtml += "<input type=\"button\" id=\"" + Tagname[0] + "\" onclick=\"EditDomain(id)\" class=\"edittbutton edittbuttonover\" style=\"cursor:pointer\">";
                               InnerHtml += "</a>";
                               InnerHtml += "<input type=\"button\" id=\"" + Tagname[0] + "\" class=\"deletbutton deletehover fltLeft\" style=\"cursor:pointer;\" onclick=\"ShowDeletePopup(id)\">";
                               InnerHtml += "</td>";
                               InnerHtml += "</tr>";
                             });

                              $('#grdLeadQueue tbody').append(InnerHtml);
                          },
                          error: function (xhr) {

                          }
                      });
                      NxtCount++;
                  }


              }
              lastScrollTop = st;

          }

/////c# method on controller side

 public ActionResult TagSettings(string Searchstr, int NextCount = 0)
        {
            try
            {
                #region Calculate take count

                int SkipCount = 0;
                int TakeCount = 0;
                int RowCount = 17;
                long Cnt = 0;

                if (NextCount == 0)
                {
                    TakeCount = 17;
                }
                else
                {
                    SkipCount = 17 + ((NextCount - 1) * RowCount);
                    TakeCount = (SkipCount + RowCount);
                    Cnt = SkipCount + 1;
                }

                #endregion Calculate take count

               
                vmTagSettings vmTag = new vmTagSettings();
                vmTag.lstTag = Tag.getSearchedTagByNameAndCount(TakeCount, SkipCount, "");
                vmTag.TagCount = vmTag.lstTag.Count;
                vmTag.lstTag = vmTag.lstTag.ToList();
                List<tag> lstTag = vmTag.lstTag;

           
              
               
                if (NextCount != 0)
                {
                    return Json(vmTag, JsonRequestBehavior.AllowGet);
                }
                else
                {
                    return View(vmTag);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }</tag>