AJAX控件的简单使用

<div>
<asp:UpdatePanel ID="upp1" runat="server">
<ContentTemplate>
<asp:ScriptManager ID="sm" runat="server">

</asp:ScriptManager>
<asp:Calendar runat="server" ID="cld"></asp:Calendar>

<br />
<asp:DropDownList ID="DropDownList1" runat="server" runat="server"
AutoPostBack="true"
onselectedindexchanged="DropDownList1_SelectedIndexChanged" >
<asp:ListItem Value="Red" >红色</asp:ListItem>
<asp:ListItem Value="Blue" >蓝色</asp:ListItem>
</asp:DropDownList>

</ContentTemplate>

</asp:UpdatePanel>
</div>

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
cld.DayStyle.BackColor = System.Drawing.Color.FromName(DropDownList1.SelectedItem.Value);
}