using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class eventsByMonth : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            string calDate = "";
            DateTime eventDate = new DateTime();

            if (Request.QueryString["calDate"] != "" && Request.QueryString["calDate"] != null)
                eventDate = DateTime.Parse(Request.QueryString["calDate"]);
            else
                eventDate = DateTime.Today;

            lblHdrMonth.Text = eventDate.ToString("MMMM");

            SetNextAndPrevious(eventDate);

            Master.NavType = "event";
        }
    }

    private void SetNextAndPrevious(DateTime dteventDate)
    {
        DateTime eventDate = dteventDate;
        DateTime previousDate = new DateTime();
        DateTime nextDate = new DateTime();

        previousDate = eventDate.AddMonths(-1);
        nextDate = eventDate.AddMonths(1);
 
        ViewState.Add("previousDate", previousDate.ToShortDateString());
        ViewState.Add("nextDate", nextDate.ToShortDateString());
    }

    protected void lbtnPrevious_Click(object sender, EventArgs e)
    {
        Response.Redirect("eventsByMonth.aspx?calDate=" + ViewState["previousDate"].ToString());
    }

    protected void lbtnNext_Click(object sender, EventArgs e)
    {
        Response.Redirect("eventsByMonth.aspx?calDate=" + ViewState["nextDate"].ToString());
    }
}