GridView的模板列如何绑定到数据库表的某个字段,如何获取模板列中某个单元的值！！！！！新手！！说详细点！谢谢！

Question

 <asp:GridView ID="GridView_Chapter" runat="server" AutoGenerateColumns="False" CellPadding="4" Width="750px" BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" OnInit="GridView_Chapter_Init">
            <FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
            <Columns>
                <asp:TemplateField HeaderText="章编号">
                    <ItemTemplate>
                        <asp:TextBox ID="txt_Num" runat="server"  BorderWidth="0px" Height="29px" Width="150px"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:HyperLinkField  DataNavigateUrlFields="Chapter_Num"  DataTextField="Tittle_Chapter"
                    HeaderText="章名称" DataNavigateUrlFormatString="~/section_page.aspx?">
                    <ControlStyle Width="500px" />
                    <ItemStyle HorizontalAlign="Center" Width="500px" Height="20px" />
                </asp:HyperLinkField>
                <asp:TemplateField HeaderText="章链接">
                    <ItemTemplate>
                        <asp:HyperLink ID="HyperLink2" runat="server">HyperLink</asp:HyperLink>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <RowStyle BackColor="White" BorderWidth="1px" Height="30px" ForeColor="#330099" />
            <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
            <PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
            <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
            <PagerTemplate>
                <asp:HyperLink ID="HyperLink1" runat="server">超级链接</asp:HyperLink>
            </PagerTemplate>
        </asp:GridView>
问题:
1 . 如何将数据库中的Chapter_Num 这个字段绑定到模板列的 “章编号” 字段！(说明：已经将GridView的DataSource绑定到指定的 DataSet了！)
2 . 如何获取GridView中的，某个单元的值,记得以前实训的时候做过，忘记了！好像用 Eval这个函数！！！，但不知道怎么来用了！！比如获取"章名称"这一列某个单元格的值!!!!!!!
说详细点！最好有代码示例！我新手！谢谢！！！！！！

Answer 1

<asp:TemplateField HeaderText="章编号">
      <ItemTemplate>
           <asp:TextBox ID="txt_Num" runat="server"  BorderWidth="0px" Height="29px" Width="150px" Text='<%# Eval("Chapter_Num") %>'></asp:TextBox>
      </ItemTemplate>
</asp:TemplateField>

Answer 2

 foreach (GridViewRow gr in this.GridView1.Rows)
        {
            TextBox txt= (TextBox )gr.FindControl("txt_Num");
            if (txt!=null)
            {
                string str=txt.Text.Trim();
            }
        }

Answer 3

1.
<asp:TemplateField HeaderText="章编号"> 
      <ItemTemplate> 
          <asp:TextBox ID="txt_Num" runat="server"  BorderWidth="0px" Height="29px" Width="150px" Text=' <%# Eval("Chapter_Num") %>'> </asp:TextBox> 
      </ItemTemplate> 
</asp:TemplateField> 2.
foreach (GridViewRow gr in GridView_Chapter.Rows) 
{ 
     TextBox txt= (TextBox )gr.FindControl("txt_Num"); 
     if (txt!=null) 
     { 
         string str=txt.Text.Trim(); 
      } 
}