SPView object Query property update does not work.

"I've updated the query property of the view as show in the code but the view does not work unless I select the view/ modify the view and hit the Ok button using the user interface.

bottom line: programmatic update of query does not work as expected."

private void UpdateViewV2()
    {
        SPSite site = SPContext.Current.Site;
        SPSecurity.RunWithElevatedPrivileges(delegate()
        {
            using (SPSite elevatedPrivilegesSiteColl = new SPSite(site.ID))
            {
                using (SPWeb oWebsite = elevatedPrivilegesSiteColl.RootWeb)
                {
                    oWebsite.AllowUnsafeUpdates = true;
                    SPList oList = oWebsite.Lists[this.listName];
                    SPView oView = oList.Views[this.viewName];
                    oView.Query = ""+
                                                "" + this.strStartDate + ""+
                                                "" + this.strEndDate + ""+
                                    "";
                    oView.Update();
                    oList.Update();
                    oWebsite.AllowUnsafeUpdates = false;
                    oWebsite.Update();
                }
            }
        });
        site.Close();
    }