输出日历格式

输出日历格式：
protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {

        Response.Write(string.Format("您算选中的日期是{0}",
           Calendar1.SelectedDates[0].ToString("yyyy-MM-dd")));
    }