With the new Excel-like filtering (through the HeaderContextMenu
) you could achieve the desired result within the OnFilterCheckListItemsRequested event, where you could get the list with the selected values in the already filtered columns in the following manner:
protected void RadGrid1_FilterCheckListItemsRequested(object sender, GridFilterCheckListItemsRequestedEventArgs e)
string selectedDivisions = (sender as RadGrid).MasterTableView.GetColumn("Divisions").ListOfFilterValues;
Once you get the checked values in the other columns you could filter the data before setting it to the ListBox.
Hope this helps.
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