Object reference not set to an instance of an object.
[NullReferenceException: Object reference not set to an instance of an object.]
   Telerik.Web.UI.GridBoundColumn.ApplyAggregates35(TableCell cell, String footerText) +132
   Telerik.Web.UI.GridBoundColumn.cell_DataBinding(Object sender, EventArgs e) +492
   System.Web.UI.Control.OnDataBinding(EventArgs e) +99
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +92
   System.Web.UI.Control.DataBind() +15
   System.Web.UI.Control.DataBindChildren() +211
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +102
   System.Web.UI.Control.DataBind() +15
   Telerik.Web.UI.GridItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows) +517
   Telerik.Web.UI.GridTableView.CreateFooterItem(Boolean useDataSource, GridColumn[] copiedColumnSet, GridTFoot tfoot) +92
   Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) +1009
   Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) +549
   System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +57
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +114
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +31
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +142
   Telerik.Web.UI.GridTableView.PerformSelect() +16
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +73
   Telerik.Web.UI.GridTableView.DataBind() +233
   Telerik.Web.UI.GridDataItem.OnExpand() +289
   Telerik.Web.UI.GridItem.set_Expanded(Boolean value) +109
   Telerik.Web.UI.GridExpandCommandEventArgs.ExecuteCommand(Object source) +34
   Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e) +134
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) +87
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +118
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +166
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

Can anyone please help? or its a permanent bug ?

Regards
Arijit

We have been trying to use a combination of features of the RadComboBox. We want to use Load-on-Demand with CustomText AND also set/persist a SelectedValue, with a large number of records. We have encountered a couple issues that prevent us from accomplishing our goal.

The online demo ( http://demos.telerik.com/aspnet-ajax/combobox/examples/populatingwithdata/autocompletesql/defaultcs.aspx ) narrowly avoids one of the major issues we have encountered with the suggested implementation of load-on-demand. The online demo loads just enough records per request (10) that no matter what custom text is entered, there is never more than one request worth of filtered items to load. We often need multiple requests to load all of the matching/filtered items for the custom text, but the demonstrated method reverts to loading unfiltered items after the first request. We tried working around this issue ourselves, but then ran into another quirk of the load-on-demand mechanism.

The demonstrated method seems to only be feasible in the context of a single pass questionaire. Our application requires users be able to view and edit previous selections in fields with load-on-demand enabled. We are able to set a selected value, but then load-on-demand breaks. Every time the user clicks the load more results button, another duplicate of the selected value is added to the list. We tried various workarounds without success. We cannot distinguish between the first request (showing the selected value) and subsequent requests (showing filtered or unfiltered items based on the custom text).

We need to accomplish the following with the RadComboBox:

1. Load-on-demand (we have very large lists of items to select from in our application)
2. Custom text/filter (loading multiple pages of items isn't enough, we need to filter the list)
3. Selected value (on returning to the page, the user needs to be able to see what they selected previously as well as select a new value)

We are very close to having all three features working together, but are missing a piece. When the user opens the combobox, sees the selected value listed as the only item, and clicks the load more results button, we need to load unfiltered items instead of filtered items. We can always load the unfiltered items, but then we have the opposite problem: the custom text is never used to get a filtered list of items. This is the last obstacle to overcome in order to get load-on-demand working in our application the way it should (we think) by design.

Unhandled exception at line 8, column 21447 in http://localhost:16007/CESIReportExec/DES/GetFiles.aspx?type=scripts&version=5.0.1.5000&files=0_1_2_4_7_8_9_15_16_17_18_20_22_24_27_31_33_41_44_49_54

0x800a138f - Microsoft JScript runtime error: Unable to get value of the property '10': object is null or undefined

The code that produces this appears in teh IE debugger: "vMO.MYMonth.innerHTML=(vMO.AMN?vCI.AMN[vM]:vCI.MN[vM]);"
which is in DES\GetFiles.aspx. I know that vMO.AMN is undefined and vM=10; This code is just a small part of a large amount of Telerik code. Is there anything else you need from me to give me some idea as to what I can do?

Thank you.