Paging issue

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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.I am using pageindexchanging event also but still I am not able
to see paging on the page.I am binding all times.I need the Gridview to be created dynamically so I am writing code behind

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);

void workGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        bindWorkGrid(workType);
        reg_workgrid.PageIndex = e.NewPageIndex;
        reg_workgrid.DataBind();
    }