Use of caching in Asp.net (GidView Demo)

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Xml;

using System.Data;

using System.IO;

using System.Web.Caching;

public partial class _Default : System.Web.UI.Page

{

    string strXmlAllDetails = string.Empty;

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            getData();

        }

    }

    public DataSet getData()

    {

        DataSet dsAllDetailsOutput = (DataSet)Cache["mydata"];

        dsAllDetailsOutput = new DataSet();

        WebServiceDemoExample objWebServiceDemoExample = new WebServiceDemoExample();

        string strXmlOutput = objWebServiceDemoExample.FetchAllDetailsAdmin();

        XmlReader objXmlReader = System.Xml.XmlReader.Create(new StringReader(strXmlOutput));

        dsAllDetailsOutput.ReadXml(objXmlReader);

        Cache.Insert("mydata", dsAllDetailsOutput, new CacheDependency(Server.MapPath("")), DateTime.Now.AddHours(12), Cache.NoSlidingExpiration);

        if (dsAllDetailsOutput.Tables.Count > 0)

        {

            if (dsAllDetailsOutput.Tables[0].Rows.Count > 0)

            {

                GridView1.DataSource = dsAllDetailsOutput;

                GridView1.DataBind();

            }

        }

        return dsAllDetailsOutput;

    }

    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)

    {

        DataSet ds = (DataSet)Cache["mydata"];

        GridView1.PageIndex = e.NewPageIndex;

        GridView1.DataSource = ds;

        GridView1.DataBind();

    }

}