使用AJAX日历控件，显示某些日期（CalendarExtender）

<div>
<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></ajaxToolkit:ToolkitScriptManager>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<ajaxToolkit:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="TextBox1" Format="yyyy/MM/dd"></ajaxToolkit:CalendarExtender>
</div>

//disable the past date
CalendarExtender1.StartDate = DateTime.Now;

//disable the futhre date
CalendarExtender1.EndDate = DateTime.Now;

//Start Calendar after one month from the Present Date
CalendarExtender1.StartDate = DateTime.Now.AddMonths(1);