Binding Events to calendar based on Calendar Date

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;
using Prasad;
using System.Xml;
public partial class Default10 : System.Web.UI.Page
{
    DataSet dset = new DataSet();
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
     
       
     DateTime dtNow=  Calendar1.SelectedDate;
     string toDayFormat = dtNow.ToString("u");
     string[] EventStartDate = toDayFormat.Split(new Char[] { ' ' });
    
      
        Prasad.Lists listService = new Prasad.Lists();
        listService.UseDefaultCredentials=true;
        listService.Url = "http://agmsm:9999/sites/mnet/venkat/_vti_bin/Lists.asmx";
        string strListName = "Events";
        System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
        System.Xml.XmlElement query = xmlDoc.CreateElement("Query");

        System.Xml.XmlElement viewFields = xmlDoc.CreateElement("ViewFields");
        System.Xml.XmlElement queryOptions = xmlDoc.CreateElement("QueryOptions");
        viewFields.InnerXml = "<FieldRef Name=\"ID\" /><FieldRef Name=\"Title\" /><FieldRef Name=\"EventDate\" /><FieldRef Name=\"Location\" />";
        //string strDate=Calendar1.s
        //2010-08-10T00:00:00Z
        //8/11/2010 12:00:00 AM
        query.InnerXml = "<OrderBy><FieldRef Name='ID' Ascending='False' /></OrderBy><Where><Eq><FieldRef Name='EventDate' /><Value Type='DateTime'>" + EventStartDate[0] + "</Value></Eq></Where>";
        System.Xml.XmlNode nodeListItems = listService.GetListItems(strListName, null, query, viewFields, null, null, null);
        //System.Xml.XmlNode nodeListItems = listService.GetListItems(listName, viewName, query, viewFields, rowLimit, queryOptions, null);
        DataSet ds = getData(nodeListItems);
        DataTable dt = ds.Tables["row"];
        GridView1.DataSource = dt;
        GridView1.DataBind();
        System.Xml.XmlElement batchElement = xmlDoc.CreateElement("Batch");
        batchElement.SetAttribute("OnError", "Continue");
        batchElement.SetAttribute("ListVersion", "1");
    }
    public DataSet getData(XmlNode xmlnodeinput)
    {
        if (xmlnodeinput != null)
        {
            XmlTextReader xtr = new XmlTextReader(xmlnodeinput.OuterXml, XmlNodeType.Element, null);
            //dataset = new DataSet();
            dset.ReadXml(xtr);
        }
        return dset;
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[2].Text = Convert.ToDateTime(e.Row.Cells[2].Text).ToShortDateString();
        }
    }
}