在datalist和datagrid中实现多条的修改

1：确定datalist 或者 datagrid在
how did you bind the DataList, make sure it is inside
if (!IsPostBack)
{
  //myList1.DataBind();
}
2： 

<asp:datalist id="datalist_programe_url" style="Z-INDEX: 102; LEFT: 88px; POSITION: absolute; TOP: 536px"
    runat="server" Height="136px">
    <HeaderTemplate>
    </HeaderTemplate>
    <ItemTemplate>

       <asp:CheckBox Runat="server" ID="editurlid" Text="edit"></asp:CheckBox>
       <asp:Label Runat=server ID=url_id Text='<%# DataBinder.Eval(Container.DataItem, "my_p_id") %>' Visible=False>
       </asp:Label>
       <asp:ImageButton ImageUrl="pic/up.gif" Runat=server ID="order_up" CommandArgument='<%# DataBinder.Eval(Container.DataItem, "my_c_order") %>' CausesValidation=False AlternateText=把播放顺序提前 OnCommand=set_play_order_up CommandName='<%# DataBinder.Eval(Container.DataItem, "my_p_id") %>'>
       </asp:ImageButton>
       <asp:ImageButton ImageUrl="pic/down.gif" Runat=server ID="order_down" CommandArgument='<%# DataBinder.Eval(Container.DataItem, "my_c_order") %>' CausesValidation=False AlternateText=把播放顺序滞后 OnCommand=set_play_order_down CommandName='<%# DataBinder.Eval(Container.DataItem, "my_p_id") %>'>
       </asp:ImageButton>
      
       <asp:TextBox Text='<%# DataBinder.Eval(Container.DataItem,"my_c_name")%>' Runat=server ID='my_c_name' Width=150 onchange="javascript:this.parentElement.parentElement.cells(0).children(0).checked=true;">
       </asp:TextBox>
      
       <asp:TextBox Text='<%# DataBinder.Eval(Container.DataItem,"my_url")%>' Runat=server ID='my_url' Width=280 onchange="javascript:this.parentElement.parentElement.cells(0).children(0).checked=true;">
       </asp:TextBox>
      
       <asp:button ID="del" Text="删除" runat="server" CommandName="delete" oncommand="DataGrid_DeleteRow" CommandArgument='<%# DataBinder.Eval(Container.DataItem, "my_p_id") %>' CausesValidation="false">
       </asp:button>
     
    </ItemTemplate>
    <FooterTemplate>
     
      
       <asp:Button id="Button4" runat="server" Text="提交修改节目名称或地址" CausesValidation="False" OnCommand="update_programe_name_url"></asp:Button>
     
    </FooterTemplate>
   </asp:datalist>
3：checkblog MycheckBlog=new checkblog();
   MycheckBlog.OpenBase();
   MycheckBlog.procedurename="update myprograme_info set my_c_name=@my_c_name,my_url=@my_url where my_p_id=@my_p_id and username=@username";
   MycheckBlog.mysqlcommand=new SqlCommand(MycheckBlog.procedurename,MycheckBlog.myConnection);
   MycheckBlog.mysqlcommand.Parameters.Add(new SqlParameter("@my_c_name", SqlDbType.NVarChar,50));
   MycheckBlog.mysqlcommand.Parameters.Add(new SqlParameter("@my_url", SqlDbType.NVarChar,200));
   MycheckBlog.mysqlcommand.Parameters.Add(new SqlParameter("@username", SqlDbType.NVarChar,20));
   MycheckBlog.mysqlcommand.Parameters.Add(new SqlParameter("@my_p_id", SqlDbType.Int));
   foreach(DataListItem item in datalist_programe_url.Items)
   {
    CheckBox cb=(CheckBox)item.FindControl("editurlid");
    if(cb.Checked)
    {
     Label lbl=(Label)item.FindControl("url_id");
     TextBox my_c_name=(TextBox)item.FindControl("my_c_name");
     TextBox my_url=(TextBox)item.FindControl("my_url");

     MycheckBlog.mysqlcommand.Parameters["@my_c_name"].Value=my_c_name.Text;
     MycheckBlog.mysqlcommand.Parameters["@my_url"].Value=my_url.Text;
     MycheckBlog.mysqlcommand.Parameters["@username"].value="/str_name;
     MycheckBlog.mysqlcommand.Parameters["@my_p_id"].Value=Convert.ToInt32(lbl.Text);     "
     MycheckBlog.mysqlcommand.ExecuteNonQuery();
    }
   }
   MycheckBlog.CloseBase();
   select_programe_url();