Paging not even displaying

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ASP.NET

Hi All,
I am binding gridview dynamically and when i try for paging I am not able to even see the paging on the page.My coding is as below.Please
suggest what I am misssing.I am binding Gridview in Page_Init event.paging is not showing at all with gridview.what could be the reason.Please suggest

workGrid.RowEditing += new GridViewEditEventHandler(workGrid_RowEditing);
    workGrid.RowDeleting += new GridViewDeleteEventHandler(workGrid_RowDeleting);
    workGrid.RowDataBound += new GridViewRowEventHandler(workGrid_RowDataBound);

    TemplateField BtnTmpField = new TemplateField();
    BtnTmpField.ItemTemplate = new GridViewTemplate(ListItemType.Item, "Modify", "Command");
    BtnTmpField.HeaderTemplate = new GridViewTemplate(ListItemType.Header, "Modify", "Command");
    BtnTmpField.EditItemTemplate = new GridViewTemplate(ListItemType.EditItem, "...", "Command");
    workGrid.Columns.Clear();

    workGrid.Columns.Add(BtnTmpField);

    for (int workCnt = 0; workCnt < dtWorksGrid.Columns.Count; workCnt++)
    {
        TemplateField ItemTmpField = new TemplateField();
        // create HeaderTemplate
        ItemTmpField.HeaderTemplate = new GridViewTemplate(ListItemType.Header, dtWorksGrid.Columns[workCnt].ColumnName, dtWorksGrid.Columns[workCnt].DataType.Name);
        ItemTmpField.HeaderStyle.Width = Unit.Pixel(145);
        // create ItemTemplate
        ItemTmpField.ItemTemplate = new GridViewTemplate(ListItemType.Item, dtWorksGrid.Columns[workCnt].ColumnName, dtWorksGrid.Columns[workCnt].DataType.Name);
        //create EditItemTemplate
        ItemTmpField.EditItemTemplate = new GridViewTemplate(ListItemType.EditItem, dtWorksGrid.Columns[workCnt].ColumnName, dtWorksGrid.Columns[workCnt].DataType.Name);
        // then add to the GridView
        workGrid.Columns.Add(ItemTmpField);
    }

    workGrid.DataSource = dtWorksGrid;
    workGrid.DataBind();
    workGrid.AllowPaging = true;
    workGrid.PageSize = 5;
    workGrid.PageIndexChanging += new GridViewPageEventHandler(workGrid_PageIndexChanging);