Background: <br /> <asp:DropDownList ID="ColorList" AutoPostBack="True" OnSelectedIndexChanged="DropDownSelection_Change" 字串5 runat="server"> <asp:ListItem Selected="True" Value="White"> White </asp:ListItem> 字串8 <asp:ListItem Value="Silver"> Silver </asp:ListItem> <asp:ListItem Value="DarkGray"> 字串1 Dark Gray </asp:ListItem> <asp:ListItem Value="Khaki"> Khaki </asp:ListItem> 字串4