**Dynamic JQGrid From Data Table**
$(document).ready(function () {
        var ColN, ColM, ColD, capEN;
        var sPath = window.location.pathname;
        var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);
        //alert(sPage);
        $.ajax({
            url: sPage+'?method=getGridHeadData',
            type: "POST",
            contentType: "application/json; charset=utf-8",
            data: {},
            dataType: "json",
            success: function (data, st) {
                if (st == "success") {
                    ColN = data.rowsHead;//jqgrid heading data
                    ColM = data.rowsM; // its column model
                    ColD = data.rows; // Data
                    createGrid();
                }
            },
            error: function () {
                alert("Error with AJAX callback");
            }
        });

        function createGrid() {
            jQuery("#AccountingCodesGrid").jqGrid({

                datatype: 'json',
                url: sPage+'?method=getGridData',
                mtype: 'POST',
                ajaxGridOptions: { contentType: 'application/json; charset=utf-8' },
                serializeGridData: function (postData) {
                    return JSON.stringify(postData);
                },
                jsonReader: { repeatitems: false, root: "rows", page: "page", total: "total", records: "records" },

                //data: ColD,
                colNames: ColN,
                colModel: ColM,
                loadonce: true,
                pager: jQuery('#pager'),
                rowNum: 5,
                rowList: [5, 10, 20, 50],
                viewrecords: true
            })


        }
        jQuery("#AccountingCodesGrid").jqGrid('navGrid', '#Pager', { edit: false, add: false, del: false }, null, null, true, { multipleSearch: true });
        var height = $(window).height();


    });

the code behind
 **In page load..................................................................**

if (Request.QueryString["method"] == "getGridData")
            {
                Request.InputStream.Position = 0;
                StreamReader ipStRdr = new StreamReader(Request.InputStream);
                string json = ipStRdr.ReadToEnd();
                JavaScriptSerializer jser = new JavaScriptSerializer();
                Dictionary<string,> dict = jser.Deserialize<dictionary><string,>>(json);

                getGridData(int.Parse(dict["page"].ToString()), int.Parse(dict["rows"].ToString()), bool.Parse(dict["_search"].ToString()), dict["sord"].ToString());
                Response.End();
            }
            else if (Request.QueryString["method"] == "getGridHeadData")
            {
                getGridHeadData();
                Response.End();
            }

**Method to get data in json form----------------------------------------------------**
public void getGridData(int page, int rows, bool _search, string sord)
        {
            DataTable dtRecords = dtSource;// Data Table
            int recordsCount = dtRecords.Rows.Count;

            JqGridData objJqGrid = new JqGridData();
            objJqGrid.page = page;
            objJqGrid.total = ((recordsCount + rows - 1) / rows);
            objJqGrid.records = recordsCount;
            objJqGrid.rows = ConvertDT(dtRecords);

            List<string> liob = new List<string>();
            foreach (DataColumn column in dtRecords.Columns)
            {
                liob.Add(column.ColumnName);
            }
            objJqGrid.rowsHead = liob;

            List<object> colcontetn = new List<object>();
            foreach (var item in liob)
            {
                JqGridDataHeading obj = new JqGridDataHeading();
                obj.name = item.ToString();
                obj.index = item.ToString();
                colcontetn.Add(obj);
            }
            objJqGrid.rowsM = colcontetn;

            JavaScriptSerializer jser = new JavaScriptSerializer();
            Response.Write(jser.Serialize(objJqGrid));

        }