Client side:

 <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>   
        <cc1:Map ID="FullMapView" runat="server" Height="900px" Width="960px" MapUnit="Meter">
        </cc1:Map>    
    <Description:DescriptionPanel ID="DescPanel" runat="server">
        This sample displays a google map. Click buttons below to switch between different
        Google maps.
        <br />
        <br />
        <asp:Button CssClass="btn" ID="btnRoad" runat="server" Text="Normal" OnClientClick="FullMapView.SetCurrentBackgroundMapType(google.maps.MapTypeId.ROADMAP); return false;" />
        <asp:Button CssClass="btn" ID="btnAerial" runat="server" Text="Hybrid" OnClientClick="FullMapView.SetCurrentBackgroundMapType(google.maps.MapTypeId.HYBRID); return false;" /><br />
        <asp:Button CssClass="btn" ID="btnSatellite" runat="server" Text="Satellite" OnClientClick="FullMapView.SetCurrentBackgroundMapType(google.maps.MapTypeId.SATELLITE); return false;" />
        <asp:Button CssClass="btn" ID="btnPhysical" runat="server" Text="Physical" OnClientClick="FullMapView.SetCurrentBackgroundMapType(google.maps.MapTypeId.TERRAIN); return false;" />
    </Description:DescriptionPanel>
    </form>


Server side:

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                FullMapView.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF"));
                FullMapView.CurrentExtent = new RectangleShape(-13939426.6371, 6701997.4056, -7812401.86, 2626987.386962);
                FullMapView.MapUnit = GeographyUnit.Meter;

                FullMapView.MapTools.OverlaySwitcher.Enabled = true;
                FullMapView.MapTools.MouseCoordinate.Enabled = true;

                GoogleOverlay google = new GoogleOverlay("Google Map");
                google.JavaScriptLibraryUri = new Uri(ConfigurationManager.AppSettings["GoogleUriV3"]);
                google.GoogleMapType = GoogleMapType.Normal;
                google.IsVisibleInOverlaySwitcher = true;
                google.IsBaseOverlay = true;

                FullMapView.CustomOverlays.Add(google);
            }            
        }