一,
<asp:DropDownList ID="ddl_JG" runat="server" Visible ="false"> <asp:ListItem Value="-1" Text="是否及格" Selected="True"></asp:ListItem> <asp:ListItem Value="1" Text="及格"></asp:ListItem> <asp:ListItem Value="0" Text="不及格"></asp:ListItem> </asp:DropDownList>
this.ddl_JG.Visible = true;//显示原文:https://www.cnblogs.com/wzzyuxi/p/11799431.html