Help with displaying of google map in ASP.NET

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C#

ASP.NET

C#4.0

Im using google map control in my ASP.NET project, i have added the control assembly to my bin folder inn the project directory using visual studio, but when viewing it in the map, the map content does not display but only show the zoom control. here is the code. help me out please.

protected void Page_Load(object sender, EventArgs e)
{
    if (!Request.IsAuthenticated)
    {
        Response.Redirect("~/Login.aspx");
    }

    if (string.IsNullOrWhiteSpace(Request.QueryString["latitude"]) && string.IsNullOrWhiteSpace(Request.QueryString["longitude"]))
    {
        lblError1.Font.Size = 18;
        lblError1.Text = "The selected vehicle has not arquired a GPS coordinate fix";
    }

    else
    {
        string querylat = Request.QueryString["latitude"];
        string querylongt = Request.QueryString["longitude"];
        double value1 = double.Parse(querylat);
        double value2 = double.Parse(querylongt);

        Artem.Web.UI.Controls.GoogleMap GistMeEnforaMap = new GoogleMap();
        GistMeEnforaMap.Visible = true;
        GistMeEnforaMap.Enabled = true;
        GistMeEnforaMap.Zoom = 10;
        GistMeEnforaMap.Height = 600;
        GistMeEnforaMap.Width = 800;
        GistMeEnforaMap.EnableGoogleBar = true;
        GistMeEnforaMap.Key = "My googlemap key goes in here";
        GoogleMarker marker = new GoogleMarker(value1, value2);
        GistMeEnforaMap.Markers.Add(marker);
        GistMeEnforaMap.Latitude = marker.Latitude;
        GistMeEnforaMap.Longitude = marker.Longitude;
        GistMeEnforaMap.DefaultAddress = "Abuja, Nigeria";
        GistMeEnforaMap.DefaultMapView = GoogleMapView.Hybrid;
        PanelEnforaMap.Controls.Add(GistMeEnforaMap);

        //GistMeEnforaMap.Markers.Add(new GoogleMarker(value1, value2));
        //GistMeEnforaMap.Latitude = value1;
        //GistMeEnforaMap.Longitude = value2;
    }
}