The LLBLGenProDataSource will be refreshed (data would be refetched) on the following conditions:
1- If the underlying datastore was updated through the LLBLGenProDataSource.
2- If you specify or changed the FiterToUse property of the datasource.
3- If you set the Refetch property to true and rebind to the the databound control.
myDatasource.Refetch = true;
myGrid.DataBind();