怎样获取获取GridView里面的label

GridView如下：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
      <Columns>
 <asp:BoundField DataField="errornum" HeaderText="错误数" />   //control[0]
 <asp:BoundField DataField="rightnum" HeaderText="正确数" />   //controls[1]
 <asp:BoundField DataField="adatatime" HeaderText="答题时间" /> //control[2]
    
  <asp:TemplateField HeaderText="正确率">                                       //control[3]
      <ItemTemplate>
       <asp:Label ID="bfb" runat=server>aa</asp:Label>
      </ItemTemplate>
      </asp:TemplateField>

      </Columns>
      </asp:GridView>

我们现在要在 GridView1_RowDataBound(object sender, GridViewRowEventArgs e)事件中获取
<asp:Label ID="bfb" runat=server>aa</asp:Label>的引用
代码如下：

1     protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
2     {
3         if (e.Row.RowType == DataControlRowType.DataRow)
4         {
5              Label bfb = (Label)e.Row.Controls[3].FindControl("bfb");
  
6 
7         }
8 
9     }

上面的第五行代码 Label bfb = (Label)e.Row.Controls[3].FindControl("bfb");
也可以改为     Label bfb = (Label)e.Row.Controls[3].Controls[1];
因为

<asp:TemplateField HeaderText="正确率">  </asp:TemplateField>
包含
-System.Web.UI.LiteralControl      //controls[0]
-System.Web.UI.WebControls.Label  //controls[1]
-System.Web.UI.LiteralControl      //control[2]
三个子控件，所以label 的index为1。