Reimers.dk

Hi all, I have a questions,  It's easy to add markers/polyline e.t.c but I have a problem to delete some of them(not delete the whole bunch)  when updating  the map from a timer event.  ( I need to hide/delete the old posistions and add new ones)

So please show how to loop trough the overlay collection and find the marker ID and find the ones I want to delete ? 

 Is it possible to add many markers as a  single group/layer and just show/hide this group. with a few lines of code ? instead of looping trough the whole collection ?  

 Another problem is that my  map application is growing over time ( ~1 hour )  until the browser can’t access more memory and the browser freezes

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        SQLCONN.Open()

        Dim SQLCMD As New SqlCommand("SELECT * FROM dbo.geotest", SQLCONN)

        Dim RESULT As SqlDataReader = SQLCMD.ExecuteReader

        Dim BLN, MRK, POLY As String

        Dim POS As GoogleLatLng

        Dim GMRK As GoogleMarker

        Dim GPOLY As GooglePolyline

        While RESULT.Read

            POS = New Reimers.Map.GoogleLatLng(RESULT("latitude").ToString(), RESULT("longitude").ToString())

            GMRK = New Reimers.Map.GoogleMarker("testmrk" & Guid.NewGuid.ToString, RESULT("latitude").ToString(), RESULT("longitude").ToString())

            GPOLY = New Reimers.Map.GooglePolyline("testpoly" & Guid.NewGuid.ToString, GooglePolyline.DrawCircle(POS, RESULT("radius").ToString(), Units.Metric, 45), System.Drawing.Color.Salmon, 5)

            GPOLY.Opacity = "0.5"

            BLN = "<img src=IMAGES/GEO16.PNG>&nbsp;<b>Geozon</b><br/><br/>Adress&nbsp;<b>" & RESULT("street") & ", " & RESULT("city") & "</b><br/><br/>Radie&nbsp;<b>" & RESULT("radius") & "&nbsp;Km</b>"

            GMRK.ClientSideHandlers.OnMouseOver = GMRK.OpenInfoWindowHTML(gmap, BLN)

            gmap.Overlays.Add(GMRK)

            gmap.Overlays.Add(GPOLY)

            MRK = gmap.AddOverlay(GMRK)

            POLY = gmap.AddOverlay(GPOLY)

            ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "GEOZONEPOLYLINE" & Guid.NewGuid.ToString, POLY, True)

            ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "GEOZONEMARKER" & Guid.NewGuid.ToString, MRK, True)

        End While

        SQLCONN.Close()

    End Sub