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Object reference not set to an instance of an object

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ComboBox
This is a migrated thread and some comments may be shown as answers.
raskarov
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raskarov asked on 01 Aug 2011, 07:25 PM
I have nested grids. in child table I have this: 
<telerik:GridDropDownColumn AllowFiltering="true" DataField="Customer_Id" 
DataSourceID="entityDataSource1" DropDownControlType="RadComboBox"
HeaderText="Customer Name" ListTextField="Name" ListValueField="Customer_Id"
UniqueName="CustomerNameDropDown" AllowAutomaticLoadOnDemand="true">  </telerik:GridDropDownColumn>

when I try to select it says: Object reference not set to an instance of an object
So, automatic load on demand does not work with nested grids? Or I have to use edit template?

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Shinu
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answered on 02 Aug 2011, 07:34 AM
Hello Zakary,

I suppose this is because you have Automatic Load On Demand enabled for the dropdown column. With this feature, the combo items are requested only when you open the dropdown.
aspx:
<telerik:GridDropDownColumn DataField="Customer_Id" EmptyListItemText="Select" DropDownControlType="RadComboBox"
 HeaderText="Customer Name" ListTextField="Name"  DataSourceID="entityDataSource1" AllowFiltering="true"
 ListValueField="Customer_Id" AllowAutomaticLoadOnDemand="true">
</telerik:GridDropDownColumn>

Thanks,
Shinu.
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raskarov
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answered on 02 Aug 2011, 04:32 PM
That's exactly when I receive this error, when I click on the arrow or type in something in combobox. I do not see any difference between yours and mine code. Can you please point me what changes should I do in order this to work?
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Scott
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answered on 09 Dec 2013, 05:34 PM
Was this ever resolved for you? I'm having the exact same issue with version 2013.2.611.45
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Nencho
Telerik team
answered on 12 Dec 2013, 01:44 PM
Hello,

I have tried to replicate the described issue, using 2013.2.611 version of our controls, but to no avail. Therefore,  I am attaching the sample project I have tested with. You could give it a try at your end and test the behavior. Additionally, let us know how the implementation at your end differs, so we could replicate the problem locally. In addition, here is a video, demonstrating the behavior.

Regards,
Nencho
Telerik
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raskarov
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Shinu
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raskarov
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Scott
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Nencho
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