你遇到过GridView 行绑定事件中找不到控件的事没，这里有简单详细的代码，帮我分析下，谢谢

Question

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" DataKeyNames="ProductId" OnRowDataBound="GridView1_RowDataBound">
            <Columns>
                <asp:HyperLinkField DataNavigateUrlFields="ProductId" DataNavigateUrlFormatString="&quot;Product.aspx?ProductId=&quot;+Eval(&quot;ProductId&quot;)"
                    DataTextField="ProductName" HeaderText="名称" />
                <asp:BoundField DataField="ProductId" HeaderText="编号" InsertVisible="False" ReadOnly="True"
                    SortExpression="ProductId" />
                <asp:BoundField DataField="MarketPrice" HeaderText="市场价" SortExpression="MarketPrice" />
                <asp:ImageField DataImageUrlField="pic" HeaderText="图片">
                </asp:ImageField>
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:shopConnectionString %>"
            SelectCommand="SELECT [ProductName], [ProductId], [MarketPrice], [UserPrice], [Pic] FROM [product]">
        </asp:SqlDataSource> protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
      if(e.Row.RowType ==DataControlRowType .DataRow )
      {
          if(e.Row .RowState ==DataControlRowState .Normal || e.Row .RowState ==DataControlRowState .Alternate )
          {
              HyperLink hyp = e.Row.Cells[0].Controls[0] as HyperLink;
              TextBox txt = e.Row.Cells[1].Controls[0] as TextBox; //这行出错
              if(hyp !=null && lab!=null)
              {
                  hyp.NavigateUrl = "http://www.163.com";
                  hyp.Text = "我爱中华";
                  txt.Text = "我爱中华";
              }
          }
      }

Answer 1

    TextBox txt = e.Row.Cells[1].Controls[0] as TextBox; //这行出错
     if(hyp !=null && lab!=null)
     {
      }是否应为Lable lab = e.Row.Cells[1].Controls[0] as Lable不确定if语句里面的lab是哪个变量

Answer 2

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
      if(e.Row.RowType ==DataControlRowType .DataRow )
      {
          if(e.Row .RowState ==DataControlRowState .Normal || e.Row .RowState ==DataControlRowState .Alternate )
          {
              HyperLink hyp = e.Row.Cells[0].Controls[0] as HyperLink;
              TextBox txt = e.Row.Cells[1].Controls[0] as TextBox; //这行出错
                if(hyp !=null && txt!=null)
              {
                  hyp.NavigateUrl = "http://www.163.com";
                  hyp.Text = "我爱中华";
                  txt.Text = "我爱中华";
              }
          }
      }
大家帮忙看下，怎么老是找不到，郁闷好久了这个问题