selectionModel.deselectAll() in server

Hello

I have a grid, a selectionModel (checkbox) and a store with approximately 30000 records. Then I want to select and unselect all records from C # since when doing it from the web browser collapses.

In other words I require a method similar to:

Code:

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App.grdGeocercasAll.getSelectionModel (). DeselectAll ();

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But done from the server with code in C #.
Try the following but it does not work:

Code:

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RowSelectionModel sm = grid.SelectionModel.Primary as RowSelectionModel;
Sm.DeselectAll ();
Sm.UpdateSelection ();

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Thanks for your help

Have you tried rebinding the data?. What Is the purpose displaying 30000 records?