Sharepoint SPLongOperation

I have a page with a dropdown, once you choose a value a report runs and comes back in a Gridview.  The data takes about 11 or 12 seconds to run and I want to put up some kind of wait, so I found and tried to use SPLongOperation.  The code below shoes the wait page, but then returns to the page without the data.  I think this is because I do not understand what the last line is doing.  Why does the End method of SPLongOperation require a redirect ?  I do not want to redirect, I want to stay, after the data is retrieved.

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
      {
      using (SPLongOperation longOperation = new SPLongOperation(this.Page))
        {
        //Custom Messages on the Spinning Wheel Screen
        longOperation.LeadingHTML = "Provisioning Sites";
        longOperation.TrailingHTML = "Please wait while the sites are being provisioned.";

        //Start the long operation
        longOperation.Begin();

        //Your Long Operation Code Goes Here...
        Button1.Visible = true;

        //End the long operation
        string redirectURL = SPContext.Current.Web.Url + "/SitePages/Report.aspx";
        longOperation.End(redirectURL, SPRedirectFlags.Trusted, HttpContext.Current, "");
        }
      }
DemosthenesAsked:
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Jayaraja JayaramanSharepoint Architect ConsultantCommented:
splong operation are intended to spin and bring back with refershed data which is nothing but it will do a post back. in literal words in your case atleast you shouldnt be using splongrun , you should try jquery spservices for wait and show browsing wheel.
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