GridView控件：如何使固定标题行

需要得到垂直滚动条固定标题行，因为我的GridView控件是非常大的。

Need fixed Header Row from Vertical Scroll bar, because my GridView is very large.

2制作小组是我最好的尝试（但也不会工作）：

Making 2 panels was my the best try (but also won't works) :

补充道：

      <asp:Panel style="width:720px;" runat="server" ScrollBars="Horizontal">
      <asp:GridView ID="GV3" runat="server" />          
      <br />
      <asp:Label ID="justfortest" Text="11111" runat="server" />
      <hr />
      <asp:Panel style="max-height:400px;border-style: outset; border-width: 4px; " 
              ID=HGix runat="server" ScrollBars="Vertical">
            <asp:GridView ID="GridView2" runat="server" CellPadding="4" 
            .........................
            </asp:GridView>

       </asp:Panel>
       </asp:Panel>

为什么水平线增加了第二个面板，它的滚动条=垂直，但可以作为两个的

why the horizontal line adds to second panel, it's ScrollBars="Vertical" but works as Both