EnableViewState cause error

[Amrutha]

Hi Telerik Team,

I have a Hierarchical RadGrid in which i have set EnableViewState to false and binding using NeedDataSource event.Every thing works fine for the MasterTable, but for the Child Grid, when i tried to filter, causes an error.

ERROR: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Please help and this is urgent.

Ammu Nair.

[Pavlina]

Hi,

Can you please specify how the child grid is bound? Also verify that when the EnableViewState property of the grid is set to true the problem does not persist.

All the best,
Pavlina
the Telerik team

[Amrutha]

Hi Pavlina,

Error won't come when EnableViewState is set to true. The Grid is bound as if in this demo.

Ammu Nair

[Pavlina]

Hello Ammu Nair,

Note that RadGrid does NOT manage the state for the following features when its EnableViewState property is set to false:           

• Custom edit forms (user control or form template)
• Filtering
• Grouping
• Expanded state of items in hierarchy

Therefore, to be able to filter your grid you should set the EnableViewState property to true.

More information about grid viewstate is available in the help article below:
http://www.telerik.com/help/aspnet-ajax/grid-viewstate-optimization.html

Greetings,

Pavlina
the Telerik team