asp.net中gridview自定义命令列

 <asp:TemplateField>
       <ItemTemplate>
           <asp:LinkButton runat="server" ID="lbJoin" CommandName="joinSchool" Text="加入"    CommandArgument="<%#DataBinder.Eval(Container,"RowIndex") %>" OnCommand="lbJoin_Command" CausesValidation="false"></asp:LinkButton>
       </ItemTemplate>
                    </asp:TemplateField> 

后台:    protected void lbJoin_Command(object sender,CommandEventArgs e)
    {
        int rowIndex = Convert.ToInt32(e.CommandArgument);
        int sch_id = Convert.ToInt32(SchoolView.DataKeys[rowIndex].Value);
        if (Users.SetSchoolId(Convert.ToInt32(Session["UserID"]), sch_id))
        {
            Session["S_ID"] = sch_id;
            Response.Redirect("FindClass.aspx");
        }
        else
        {
            insertHint.InnerHtml="<font color="red">加入学校失败.请重试..</font>";
        }
    }