To keep the Grid view Header Fixed

Question

HI all,

These are the Sample codes .........Here i need to keep the Gridview header Fixed while vertical Scorlling.

<asp:Panel ID="Panel1" runat="server"  Width="100%"  height="440px" ScrollBars ="Both">

<asp:GridView ID="GridView1" runat="server"  Width="150%" AutoGenerateColumns="False" 

CssClass="style2"  

onrowdatabound="GridView1_RowDataBound"   

                            ForeColor="#333333" >

                       <RowStyle BackColor="#EFF3FB" />

                        <Columns>

                            // 14  Asp Template Fields..................

                        </Columns>

                        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />

                        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />

                        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />

                        <HeaderStyle BackColor="#507CD1" CssClass="Freezing"   Font-Bold="True" ForeColor="White" />

                        <EditRowStyle BackColor="#2461BF" />

                        <AlternatingRowStyle BackColor="White" />

                    </asp:GridView>

                   </asp:Panel>