public int CurrentPage
{
    get
    {
        // look for current page in ViewState
        object o = this.ViewState["_CurrentPage"];
        if (o == null)
            return 0;
        else
            return (int)o;
    }
    set { this.ViewState["_CurrentPage"] = value; }
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
        CurrentPage = 0;
    BindPagedDataSource();
}

private void BindPagedDataSource()
{
    DataSourceSelectArguments arg = new DataSourceSelectArguments();
    DataView dv = (DataView)this.sdsOrderDetails.Select(arg);
    PagedDataSource objPds = new PagedDataSource();
    objPds.DataSource = dv;
    objPds.AllowPaging = true;
    objPds.PageSize = 5;
    objPds.CurrentPageIndex = CurrentPage;

    lblCurrentPage.Text = "Page " + (CurrentPage + 1).ToString() + " of "
        + objPds.PageCount.ToString();

    //Enable/Disable Prev and Next buttons
    btnPrev.Enabled = !objPds.IsFirstPage;
    btnNext.Enabled = !objPds.IsLastPage;

    rptOrderDetails.DataSource = objPds;
    rptOrderDetails.DataBind();
    if (objPds.PageCount > 1)
    {
        pnlNavigation.Visible = true;
    }
}

public void btnNext_Click(object sender, System.EventArgs e)
{
    // Set viewstate variable to the next page
    CurrentPage += 1;

    // Reload control
    BindPagedDataSource();
}

public void btnPrev_Click(object sender, System.EventArgs e)
{
    // Set viewstate variable to the previous page
    if (CurrentPage > 0)
        CurrentPage -= 1;
    else
        CurrentPage = 1;

    // Reload control
    BindPagedDataSource();
}

public void btnNext_Click(object sender, System.EventArgs e)
{
    // Set viewstate variable to the next page
    CurrentPage += 1;

    // Reload control
    BindPagedDataSource();
}

public void btnPrev_Click(object sender, System.EventArgs e)
{
    // Set viewstate variable to the previous page
    if (CurrentPage > 0)
        CurrentPage -= 1;
    else
        CurrentPage = 1;

    // Reload control
    BindPagedDataSource();
}

protected void rptOrderDetails_ItemDataBound(object sender, 
                                                                          RepeaterItemEventArgs e)
{
    Panel pnlOrderId = (Panel)e.Item.FindControl("pnlOrderId");
    if (pnlOrderId != null)
    {
        Label lblOrderId = (Label)pnlOrderId.FindControl("lblOrderId");
        if (lblOrderId != null && lblOrderId.Text != _orderId)
        {
            pnlOrderId.Visible = true;
            _orderId = lblOrderId.Text;
        }
    }
}