jQuery Grid Plugin - jqGrid

Hello,

I am just beginner with JQGrid. I have created a treegrid with it.

I have tried to implement "Export to CSV" but its throwing below error.

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   at System.Web.UI.ControlCollection.get_Item(Int32 index)
   at System.Web.UI.WebControls.TableCellCollection.get_Item(Int32 index)
   at Trirand.Web.Mvc.JQGrid.RenderCSVToStream(DataGrid grid, String fileName)
   at Trirand.Web.Mvc.JQGrid.ExportToCSV(Object dataSource, String fileName)
   at JQGridDemo.Controllers.IncomeDtlController.ExportToCSV() in d:\R&D\JQGrid\JQGrid\Controllers\IncomeDtlController.cs:line 216
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41()
   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49()

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As well when i do filtering it only gives one single node with expand option, when i expand it - after that i am not able to do any operation.

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It will be really helpful, if anybody can give me example of treegrid with Export to CSV and filtering feature.