xpando/Default.aspx

## Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Demo.Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="_prevYearButton" Text="<<"  OnClick="_prevYearButton_Click" runat="server" />
        <asp:Button ID="_prevMonthButton" Text="<"  OnClick="_prevMonthButton_Click" runat="server" />

        <asp:Button ID="_nextMonthButton" Text=">"  OnClick="_nextMonthButton_Click" runat="server" />
        <asp:Button ID="_nextYearButton" Text=">>"  OnClick="_nextYearButton_Click" runat="server" />

        <asp:Label ID="_currentDateLabel" runat="server" />
    </div>
    </form>
</body>
</html>

## Default.aspx.cs
using System;

namespace Demo
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                _currentDateLabel.Text = CurrentDate.ToString();
            }
        }

        public DateTime CurrentDate
        {
            get
            {
                if (null == ViewState["CurrentDate"])
                    return DateTime.Now.Date;
                return (DateTime)ViewState["CurrentDate"];
            }
            set
            {
                ViewState["CurrentDate"] = value;
            }
        }

        protected void _nextMonthButton_Click(object sender, EventArgs e)
        {
            CurrentDate = CurrentDate.AddMonths(1);
            _currentDateLabel.Text = CurrentDate.ToString();
        }

        protected void _prevMonthButton_Click(object sender, EventArgs e)
        {
            CurrentDate = CurrentDate.AddMonths(-1);
            _currentDateLabel.Text = CurrentDate.ToString();
        }

        protected void _nextYearButton_Click(object sender, EventArgs e)
        {
            CurrentDate = CurrentDate.AddYears(1);
            _currentDateLabel.Text = CurrentDate.ToString();
        }

        protected void _prevYearButton_Click(object sender, EventArgs e)
        {
            CurrentDate = CurrentDate.AddYears(-1);
            _currentDateLabel.Text = CurrentDate.ToString();
        }
    }
}
	<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Demo.Default" %>

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

	<html xmlns="http://www.w3.org/1999/xhtml">
	<head runat="server">
	<title></title>
	</head>
	<body>
	<form id="form1" runat="server">
	<div>
	<asp:Button ID="_prevYearButton" Text="<<" OnClick="_prevYearButton_Click" runat="server" />
	<asp:Button ID="_prevMonthButton" Text="<" OnClick="_prevMonthButton_Click" runat="server" />

	<asp:Button ID="_nextMonthButton" Text=">" OnClick="_nextMonthButton_Click" runat="server" />
	<asp:Button ID="_nextYearButton" Text=">>" OnClick="_nextYearButton_Click" runat="server" />

	<asp:Label ID="_currentDateLabel" runat="server" />
	</div>
	</form>
	</body>
	</html>
	using System;

	namespace Demo
	{
	public partial class Default : System.Web.UI.Page
	{
	protected void Page_Load(object sender, EventArgs e)
	{
	if (!IsPostBack)
	{
	_currentDateLabel.Text = CurrentDate.ToString();
	}
	}

	public DateTime CurrentDate
	{
	get
	{
	if (null == ViewState["CurrentDate"])
	return DateTime.Now.Date;
	return (DateTime)ViewState["CurrentDate"];
	}
	set
	{
	ViewState["CurrentDate"] = value;
	}
	}

	protected void _nextMonthButton_Click(object sender, EventArgs e)
	{
	CurrentDate = CurrentDate.AddMonths(1);
	_currentDateLabel.Text = CurrentDate.ToString();
	}

	protected void _prevMonthButton_Click(object sender, EventArgs e)
	{
	CurrentDate = CurrentDate.AddMonths(-1);
	_currentDateLabel.Text = CurrentDate.ToString();
	}

	protected void _nextYearButton_Click(object sender, EventArgs e)
	{
	CurrentDate = CurrentDate.AddYears(1);
	_currentDateLabel.Text = CurrentDate.ToString();
	}

	protected void _prevYearButton_Click(object sender, EventArgs e)
	{
	CurrentDate = CurrentDate.AddYears(-1);
	_currentDateLabel.Text = CurrentDate.ToString();
	}
	}
	}