DataGrid自定义分页

public void BindData()
{
    lblCurrentIndex.Text="第"+((Int32)dgNewManage.CurrentPageIndex+1)+"页";
    lblPageCount.Text="/共"+dgNewManage .PageCount+"页";
}

public    void PagerButtonClick(Object sender, EventArgs e)
{
    string arg = ((LinkButton)sender).CommandArgument;
    switch(arg)
    {
       case ("next"):
        if (this.dgNewManage.CurrentPageIndex < (this.dgNewManage.PageCount - 1))
            this.dgNewManage.CurrentPageIndex ++;
            break;
       case ("prev"):
        if (this.dgNewManage .CurrentPageIndex > 0)
            this.dgNewManage.CurrentPageIndex --;
            break;
       case ("last"):
        this.dgNewManage .CurrentPageIndex = (this.dgNewManage .PageCount - 1);
        break;
       case("first"):
        this.dgNewManage.CurrentPageIndex =0;
        break;
    }
    BindData();
}