数据的导航与跳转

protected System.Web.UI.WebControls.DataGrid MyDataGrid;
        protected System.Web.UI.WebControls.Label lblPageCount;
        protected System.Web.UI.WebControls.Label lblCurrentIndex;
        protected System.Web.UI.WebControls.LinkButton btnFirst;
        protected System.Web.UI.WebControls.LinkButton btnPrev;
        protected System.Web.UI.WebControls.LinkButton btnNext;
        protected System.Web.UI.WebControls.LinkButton btnLast;
        protected System.Web.UI.WebControls.TextBox go;
        protected System.Web.UI.WebControls.Label Label1;
        private OleDbConnection cn = new OleDbConnection();

        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            btnFirst.Text = "首页";
            btnPrev.Text = "前一页";
            btnNext.Text = "下一页";
            btnLast.Text = "尾页";
            OpenDatabase();
            BindGrid();
        }
        private void OpenDatabase()
        {
            cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("northwind.mdb");
            cn.Open();
        }
        private void ShowStats()
        {
            lblCurrentIndex.Text = "第 " + (MyDataGrid.CurrentPageIndex + 1).ToString() + " 页";
            lblPageCount.Text = "总共 " + MyDataGrid.PageCount.ToString() + " 页";
        }

//btnfirst,btnprev,btnnext,btnlast的事件都要设为PagerButtonClick
        public void PagerButtonClick(object sender, EventArgs e)
        {
            string arg = ((LinkButton)sender).CommandArgument.ToString();
            switch(arg)
            {
                case "next":
                    if (MyDataGrid.CurrentPageIndex < (MyDataGrid.PageCount - 1))
                    {
                        MyDataGrid.CurrentPageIndex += 1;
                    }
                    break;
                case "prev":
                    if (MyDataGrid.CurrentPageIndex > 0)
                    {
                        MyDataGrid.CurrentPageIndex -= 1;
                    }
                    break;
                case "last":
                    MyDataGrid.CurrentPageIndex = (MyDataGrid.PageCount - 1);
                    break;
                default:
                    MyDataGrid.CurrentPageIndex = System.Convert.ToInt32(arg);
                    break;
            }
            BindGrid();
            ShowStats();
        }
        private bool IsNumberic(string oText)
        {
            try
            {
                int var1=Convert.ToInt32 (oText);
                return true;
            }
            catch
            {
                return false;
            }
        }
        public void goClick(object obj,EventArgs e)
        {
            if(go.Text.Trim()!=""&&this.IsNumberic(go.Text.Trim()))
            {
                int index=Int32.Parse(go.Text.Trim())-1;
                if(index>=0 && index<MyDataGrid.PageCount)
                {
                    MyDataGrid.CurrentPageIndex=index;
                }
                BindGrid();
                ShowStats();
            }
            else
            {
                Response.Write("<script>alert(\'跳转不能为空且必须为数字\')</script>");
            }
        }
        public void BindGrid()
        {
            OleDbConnection myConnection = cn;
            DataSet ds  = new DataSet();
            OleDbDataAdapter adapter  = new OleDbDataAdapter("Select customerid,orderdate from orders order by orderid desc", myConnection);
            adapter.Fill(ds, "Document");
            MyDataGrid.DataSource = ds.Tables["Document"].DefaultView;
            MyDataGrid.DataBind();
            ShowStats();
        }
        public void MyDataGrid_Page(object sender, DataGridPageChangedEventArgs e)
        {
            int startIndex ;
            startIndex = MyDataGrid.CurrentPageIndex * MyDataGrid.PageSize;
            MyDataGrid.CurrentPageIndex = e.NewPageIndex;
            BindGrid();
            ShowStats();
        }