GridView的模版列中加入按钮，触发按钮事件后，如何获取该行的某个值?

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<asp:TemplateField>
           <ItemTemplate>
                   <asp:Button    ID="Button1"    runat="server"    OnClick="Button1_Click"    Text="Button"    />
           </ItemTemplate>
   </asp:TemplateField>
   =============================================
   protected    void    Button1_Click(object    sender,    EventArgs    e)
   {
           Button    btn    =    sender    as    Button;
           GridViewRow    row    =    btn.Parent.Parent    as    GridViewRow;
           string    a    =    row.Cells[0].ToString();//获得第一个单元格的值
           string    b    =    this.GridView1.DataKeys[row.DataItemIndex].Values[0];//获得DataKeys的值
   }

或者

   <asp:TemplateField>
           <ItemTemplate>
                   <asp:Button    ID="Button1"    runat="server"    CommandName="MyCommand"    Text="Button"    />
           </ItemTemplate>
   </asp:TemplateField>
   ===============================================
   protected    void    GridView1_RowCommand(object    sender,    GridViewCommandEventArgs    e)
   {
           if    (e.CommandName    ==    "MyCommand")
           {
                   Button    btn    =    e.CommandSource    as    Button;
                   GridViewRow    row    =    btn.Parent.Parent    as    GridViewRow;
                   string    a    =    row.Cells[0].ToString();//获得第一个单元格的值
                   string    b    =    this.GridView1.DataKeys[row.DataItemIndex].Values[0];//获得DataKeys的值
           }
   }