jQuery Grid Plugin - jqGrid

Hello.

I tried to get data from my service and post in jqGrid.

I get data from service, but I can't post values.

Can you help me?

This is my code:

jQuery("#tblFormsGrid").jqGrid({
        url: 'MyPage.aspx?MyMethod=GetDocumentsInfo',
        datatype: 'json',
        type: 'POST',
        ajaxGridOptions: { contentType: "application/json" },
        contentType: 'application/json; charset=utf-8',
        jsonReader: {
            root: "d.rows",
            page: "d.page",
            total: "d.total",
            records: "d.records"
        },
        mtype: 'GET',
        height: 330,
        width: 740,
        colNames: ['ID', 'Name', 'Number', 'Uploaded By', 'Modified By', 'Last Modified', 'File Size', 'History'],
        colModel: [
                { name: 'id', index: 'id', width: 10, sortable: false, hidden: true },
                { name: 'name', index: 'name', width: 200, sorttype: "string" },
                { name: 'Num', index: 'Num', width: 90, sorttype: "string" },
                { name: 'uploadedBy', index: 'uploadedBy', width: 90, sorttype: "string" },
                { name: 'modifiedBy', index: 'modifiedBy', width: 90, sorttype: "string" },
                { name: 'dateModified', index: 'dateModified', width: 100, sorttype: "date" },
                { name: 'fileSize', index: 'fileSize', width: 100, sorttype: "int" },
                { name: 'btnHistory', index: 'btnHistory', width: 100, sortable: false}],
        multiselect: true,
        caption: "Forms",
        rowNum: 15,
        hiddengrid: true,
        gridview: true,
        gridComplete: function() {
            var ids = jQuery("#tblFormsGrid").jqGrid('getDataIDs');
            for (var i = 0; i < ids.length; i++) {
                var row_id = ids[i];
                var btnHis = "<span class='LinkButton' onclick="GetRowData(" + row_id + ")" >View History</span>";
                jQuery("#tblFormsGrid").jqGrid('setRowData', ids[i], { btnHistory: btnHis });
            }
        }
    });

CodeBehind:

int vetId = GetVetId();
            MyService dmsc = new MyService();
            var docs = dmsc.GetAll(param1, param2);
            var documents = docs.Data;
            List<object> listDocs = new List<object>();
            foreach (myDoc doc in documents)
            {
                listDocs.Add(new
                {
                    id = doc.Id.ToString(),
                    name = doc.Name,
                    Num = "none",
                    modifiedBy = doc.ModifiedBy,
                    uploadedBy = doc.ModifiedBy,
                    dateModified = doc.Modified,
                    btnHistory=""
                });
            }
            var result = new
            {
                page = "1",
                total = "1",
                records = "15",
                rows = listDocs
            };
            System.Web.Script.Serialization.JavaScriptSerializer oSerializer =
                                new System.Web.Script.Serialization.JavaScriptSerializer();
            object jsn = oSerializer.Serialize(result);
            Response.Write(jsn);
            Response.End();