I have a dynamic grid in kendo the column names and column number changes will be different based on conditions.I am not able to export since it is a dynamic list
I have provided the code below

.cshtml

$(".download").click(function () {
        var grid = $("#Grid").data("kendoGrid");
        var options = {
            format: $(this).data("format"),
            title: 'Testreport'
        }
        var parsedInput = GetInputDataTransfer();
        var ChkBoxvalues = parsedInput.InputChkBoxValues;
        $("#export-data").val(encodeURIComponent(JSON.stringify(options)));
        $("#export-model").val(encodeURIComponent(JSON.stringify(grid.columns)));
        $("#export-chkbox").val(ChkBoxvalues);
        $("#export-tabId").val(currentTabId);  
    });

Controller action method:

when i try to convert my list to excel it throws object reference error

public FileStreamResult ExportServer(string model, string data, string selectedInputChkBoxValues, string tabId)
        {
            try
            {
                string projnumber = (string)Session[$"projectSelection_{tabId}"];
                GetProjectDetails(projnumber);
                UserInfo uInfo = ApplicationData.GetUserInfoFromSession();
                ProjectDetails CurrentProject = uInfo.CurrentProject;
                string ProjectNo = Convert.ToString(CurrentProject);
                DataSet dataSet = PLDeliveryViewBL.Display(ProjectNo, selectedInputChkBoxValues);
                var dcolumns = JsonConvert.DeserializeObject<IList<ExportColumnSettings>>(HttpUtility.UrlDecode(model));
                // Minimal column settings
                var columnsData = dcolumns.ToList();    

                List<dynamic> dlist = new List<dynamic>();
                if (dataSet.Tables.Count > 0 && dcolumns != null)
                {
                    for (var rowCount = 0; rowCount < dataSet.Tables[1].Rows.Count; rowCount++)
                    {
                        dynamic obj = new ExpandoObject();
                        var objDict = (IDictionary<string, object>)obj;

                        foreach (var column in dcolumns)
                        {
                           
                            string columnName = column.Field; 
                            objDict[columnName] = dataSet.Tables[1].Rows[rowCount][columnName];
                        }

                        dlist.Add(obj);
                    }
                }

               // Minimal options
                dynamic options = JsonConvert.DeserializeObject(HttpUtility.UrlDecode(data));
                string title = options["title"].ToString();
                string format = options["format"].ToString();  

                // Call the method to generate the stream
                Stream exportStream = null;
                try
                {
                   
                    exportStream = dlist.ToXlsxStream(columnsData, title);
                   
                }
                catch (Exception ex)
                {                 
                    throw;
                }

                // Prepare the result
                SpreadDocumentFormat exportFormat = SpreadDocumentFormat.Xlsx;
                string fileName = $"{title}.{format}";

                string mimeType = Helpers.GetMimeType(exportFormat);
                var fileStreamResult = new FileStreamResult(exportStream, mimeType)
                {
                    FileDownloadName = fileName
                };
                fileStreamResult.FileStream.Seek(0, SeekOrigin.Begin);

                return fileStreamResult;
            }
            catch (Exception ex)
            {                    
                throw;
            }
        }

Any solution can be provided?