{

        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; }

    }

    {

        DataTable dtItems = new DataTable();

        DataColumn dcName = new DataColumn();

        dcName.ColumnName = "title";

        dcName.DataType = System.Type.GetType("System.String");

        dtItems.Columns.Add(dcName);

        DataRow row;

        for (int i = 1; i <= 100; i++)

        {

            row = dtItems.NewRow();

            row["title"] = "Sample Row: I am putting here sample text for row " + i;

            dtItems.Rows.Add(row);

        }

        return dtItems;

    }

    {

        DataTable dataTable = this.GetDataTable();

        _PageDataSource.DataSource = dataTable.DefaultView;

        _PageDataSource.AllowPaging = true;

        _PageDataSource.PageSize = 10;

        _PageDataSource.CurrentPageIndex = CurrentPage;

        ViewState["TotalPages"] = _PageDataSource.PageCount;

        this.lblPageInfo.Text = "Page " + (CurrentPage + 1) + " of " + _PageDataSource.PageCount;

        this.lbtnPrevious.Enabled = !_PageDataSource.IsFirstPage;

        this.lbtnNext.Enabled = !_PageDataSource.IsLastPage;

        this.lbtnFirst.Enabled = !_PageDataSource.IsFirstPage;

        this.lbtnLast.Enabled = !_PageDataSource.IsLastPage;

        this.dListItems.DataSource = _PageDataSource;

        this.dListItems.DataBind();

        this.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();

    }

Make a to Call BindItemList Method at PageLoad()

    {

        CurrentPage += 1;

        this.BindItemsList();

    }

    protected void lbtnPrevious_Click(object sender, EventArgs e)

    {

        CurrentPage -= 1;

        this.BindItemsList();

    }

    protected void lbtnLast_Click(object sender, EventArgs e)

    {

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

        this.BindItemsList();

    }

    protected void lbtnFirst_Click(object sender, EventArgs e)

    {

        CurrentPage = 0;

        this.BindItemsList();

    }