Paging with entity data framework

Aspx Page

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

Student Name

Emailid

Student Phone

First	Previous	OnItemDataBound="dlPaging_ItemDataBound"> CommandName="Paging" Text='<%# Eval("PageText") %>'>	OnClick="lbtnNext_Click">Next	Last

.cs file

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using EWTModel;
using System.Data;

namespace EDTView
{
    public partial class StudentHome : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Session["data"] == null)
            {
                Response.Redirect("Login.aspx");
            }
            else if (!IsPostBack)
            {
                Student_Master student_master = new Student_Master();
                student_master = (Student_Master)Session["data"];
                lbluser.Text = student_master.Student_Name.ToString();
                bindstudentmarksdetails();
            }
        }
        public void bindstudentmarksdetails()
        {
            EWTEntities ob = new EWTEntities();
            var student_master = (Student_Master)Session["data"];
            var query = ob.Student_Master.Where(x => x.Student_id == student_master.Student_id).ToArray();
            if (query != null)
            {
                lblname.Text = query[0].Student_Name;
                lblemailid.Text = query[0].Student_Email;
                lblphone.Text = query[0].Student_Phone;
            }
            int intindex = Convert.ToInt32(ddlindex.SelectedValue);
            var testrecord = ob.STUDENT_TEST.Where(x => x.STUDENT_ID == student_master.Student_id && (x.TESTID>= (CurrentPage*intindex)+1
                && x.TESTID<=(CurrentPage+1)*intindex)).ToArray();
            dtgridstudentresults.DataSource = testrecord;
            dtgridstudentresults.DataBind();
            ViewState["TotalPages"] =Math.Ceiling(Convert.ToDecimal(ob.STUDENT_TEST.Where(x=>x.STUDENT_ID==student_master.Student_id).Count()/Convert.ToDecimal(ddlindex.SelectedValue)));
            this.lblPageInfo.Text = "Page " + (CurrentPage + 1) + " of " + ViewState["TotalPages"].ToString();
            lbtnFirst.Enabled = CurrentPage!=0;
            lbtnPrevious.Enabled =CurrentPage!=0;
            lbtnLast.Enabled=CurrentPage+1 != Convert.ToInt32(ViewState["TotalPages"]);
            lbtnNext.Enabled = CurrentPage + 1 != Convert.ToInt32(ViewState["TotalPages"]);
            doPaging();
        }
        protected void lbtnNext_Click(object sender, EventArgs e)
        {

            CurrentPage += 1;
            this.bindstudentmarksdetails();

        }
        protected void lbtnPrevious_Click(object sender, EventArgs e)
        {
            CurrentPage -= 1;
            this.bindstudentmarksdetails();

        }
        protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
        {
            if (e.CommandName.Equals("Paging"))
            {
                CurrentPage = Convert.ToInt16(e.CommandArgument.ToString());
                this.bindstudentmarksdetails();

            }
        }
        protected void dlPaging_ItemDataBound(object sender, DataListItemEventArgs e)
        {
            LinkButton lnkbtnPage = (LinkButton)e.Item.FindControl("lnkbtnPaging");
            if (lnkbtnPage.CommandArgument.ToString() == CurrentPage.ToString())
            {
                lnkbtnPage.Enabled = false;
                lnkbtnPage.Style.Add("fone-size", "14px");
                lnkbtnPage.Font.Bold = true;
            }
        }
        protected void lbtnLast_Click(object sender, EventArgs e)
        {

            CurrentPage = (Convert.ToInt32(ViewState["TotalPages"]) - 1);
            this.bindstudentmarksdetails();

        }
        protected void lbtnFirst_Click(object sender, EventArgs e)
        {
            CurrentPage = 0;
            this.bindstudentmarksdetails();
        }
        #region Private Properties
        private int CurrentPage
        {
            get
            {
                object objPage = ViewState["_CurrentPage"];
                int _CurrentPage = 0;
                if (objPage == null)
                {
                    _CurrentPage = 0;
                }
                else
                {
                    _CurrentPage = (int)objPage;
                }
                return _CurrentPage;
            }
            set { ViewState["_CurrentPage"] = value; }
        }
        private int fistIndex
        {
            get
            {

                int _FirstIndex = 0;
                if (ViewState["_FirstIndex"] == null)
                {
                    _FirstIndex = 0;
                }
                else
                {
                    _FirstIndex = Convert.ToInt32(ViewState["_FirstIndex"]);
                }
                return _FirstIndex;
            }
            set { ViewState["_FirstIndex"] = value; }
        }
        private int lastIndex
        {
            get
            {

                int _LastIndex = 0;
                if (ViewState["_LastIndex"] == null)
                {
                    _LastIndex = 0;
                }
                else
                {
                    _LastIndex = Convert.ToInt32(ViewState["_LastIndex"]);
                }
                return _LastIndex;
            }
            set { ViewState["_LastIndex"] = value; }
        }
        #endregion
        #region function for paging
        private void doPaging()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("PageIndex");
            dt.Columns.Add("PageText");

            fistIndex = CurrentPage - 5;

            if (CurrentPage > 5)
            {
                lastIndex = CurrentPage + 5;
            }
            else
            {
                lastIndex = 10;
            }
            if (lastIndex > Convert.ToInt32(ViewState["TotalPages"]))
            {
                lastIndex = Convert.ToInt32(ViewState["TotalPages"]);
                fistIndex = lastIndex - 10;
            }

            if (fistIndex < 0)
            {
                fistIndex = 0;
            }

            for (int i = fistIndex; i < lastIndex; i++)
            {
                DataRow dr = dt.NewRow();
                dr[0] = i;
                dr[1] = i + 1;
                dt.Rows.Add(dr);
            }

            this.dlPaging.DataSource = dt;
            this.dlPaging.DataBind();
        }

        protected void ddlindex_SelectedIndexChanged(object sender, EventArgs e)
        {
            CurrentPage = 0;
            this.bindstudentmarksdetails();
        }
        #endregion
    }
}

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