Datalist with Paging in C#

SCRREN SHORT

CODE

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 gallry : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {          
            fillgrid();
            fil();

        }
    }

    protected void fillgrid()
    {
   
        DataTable dt = dataaccess.Returndata("select *  from apkisakhi_category where status='1' order by category asc"
;         
 
        ddlcategory.DataSource = dt;
        ddlcategory.DataTextField = dt.Columns["category"].ToString();
        ddlcategory.DataValueField = dt.Columns["cat_code"].ToString();
        ddlcategory.DataBind();
     
    }
    protected void ddlcategory_SelectedIndexChanged(object sender, EventArgs e)
    {
        try
        {
            DataTable dt = dataaccess.Returndata("select * from apkisakhi_category where category='" +
ddlcategory.SelectedItem.Text + "'");
         
            if (dt.Rows.Count != 0)
            {
                DataList1.Visible = true;
                DataTable dt1 = dataaccess.Returndata("select * from apkisakhi_meta where cat_code='" +
ddlcategory.SelectedValue.ToString() + "'");
                if (dt1.Rows.Count > 0)
                {
                    Session["title"] = dt1.Rows[0]["title"].ToString();
                    ss.InnerText = Session["title"].ToString();
                }
                fil();
 
            }
            else
            {
                Response.Write("<script>alert('choose one category')</script>");
                DataList1.Visible = false;

                lblcat.Text = "";
            }
        }
        catch (Exception)
        {
            Response.Write("<script>alert('Error')</script>");
        }
       
    }
    protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
    {
      
 
    }
    public int currentpage
    {
        get
        {
            object o=this.ViewState["_c"];
            if(o==null)
                return 0;
            else
                return(int)o;
        }
        set
        {
            this.ViewState["_c"]=value;
        }
    }
    private void fil()
    {

        DataTable dt1 = dataaccess.Returndata("select * from apkisakhi_category where category='" + ddlcategory.SelectedItem.Text + "'");
        Session["cat"] = dt1.Rows[0]["cat_code"].ToString();
        lblcat.Text = dt1.Rows[0]["category"].ToString();
        DataTable dt = dataaccess.Returndata("select * from apkisakhi_addjellewery where status='1' and cat_code='" + Session["cat"] + "'  order by j_code asc   ");
        PagedDataSource p = new PagedDataSource();
        p.DataSource = dt.DefaultView;
        p.AllowPaging = true;
        p.PageSize = 15;
        p.CurrentPageIndex = currentpage;
        lblpage.Text="Page: "+" "+(currentpage+1).ToString()+" "+" of "+p.PageCount.ToString();
        prev.Enabled = !p.IsFirstPage;
        next.Enabled = !p.IsLastPage;
        DataList1.DataSource = p;
        DataList1.DataBind();
    }

    protected void prev_Click(object sender, EventArgs e)
    {
        currentpage -= 1;
        fil();
    }
    protected void next_Click(object sender, EventArgs e)
    {
        currentpage += 1;
        fil();
 
    }
}