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Hello Thomas,
the Telerik team
Yes, Begin/EndUpdate are still necessary. When you are adding a row in the grid it causes an update which refreshes the UI. When adding multiple rows this will cause several updates and will slow down your application. That is why you have to call Begin/EndUpdate. However, in our latest release we extended the grid element tree. Now it consists of a dock layout and you can host several independent grid views. The default GridTableElement is only one of them. That is why we changed GridElement to TableElement. I hope this helps.
If you have other questions, I will be glad to help.
Kind regards,
the Telerik team
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