ExportWithOpenXML kendo Grid in MVC4 getting error Object reference not set to an instance of an object

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grid

Telerik

MVC4

Kendo

I am doing ExportWithOpenXML kendo grid. I downloaded code here http://www.telerik.com/support/code-library/export-grid-to-excel[^].

Here in code I find this.

public FileResult ExportWithOpenXML([DataSourceRequest]DataSourceRequest request)
{
    //Get the data representing the current grid state - page, sort and filter
    var products = new List<Product>(db.Products.ToDataSourceResult(request).Data as IEnumerable<Product>);

But am using repository methods i tried like this

AssetMaintenanceRepository cmprep = new
    AssetMaintenanceRepository(Session["Connectionstring"].ToString());

var products = new List<MaintenanceReportSummary>(
    cmprep.GetMaintenanceSummary(
        new Guid(Session["CurrentCompanyId"].ToString()),
        new Guid(Session["AssetId"].ToString()))
.ToDataSourceResult(request).Data as IEnumerable<MaintenanceReportSummary>);

var products = cmprep.GetMaintenanceSummary(
    new Guid(Session["CurrentCompanyId"].ToString()),
    new Guid(Session["AssetId"].ToString()))
.ToDataSourceResult(request);

But am stuck at this place.

I am getting error Object reference not set to an instance of an object.

Please help me.


[Edit member="Tadit"]
Corrected formatting issues.
Added pre tags.
[/Edit]