两种不同情况的分页实现

（一）基于内容的分页实现：

实现功能：从数据库里取出信息条目直接显示在页面上，完成分页功能。

private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面      
            string mySelectQuery;
            int GetReaderCount = 0;
            int totalpage;
            string nextpage = "";
            int AbsolutePage = 1;
            int i = 0;
            int icount = 0;
            int pagesize = 8;
            string brandstr; 
            string nostr;
            string c1;
            bool Hasnext = false;
            int lastnum = 0;
            int nextnum = 0;
            System.Random MM = new System.Random(); 
            System.Random NN = new System.Random (); 
    
            nextnum = MM.Next(1000);
            lastnum = 0 - NN.Next(1000);
    
            c1 = Request["par1"];
            nextpage = Request["nextpage"];

            SqlCommand myCommand;        
            SqlDataReader myReader;
            SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["LocalDBConn"]);            
            myConnection.Open();     
            //获得信息条数
            mySelectQuery = "SELECT COUNT (*) FROM Orders";
            myCommand = new SqlCommand(mySelectQuery, myConnection);    
            myReader = myCommand.ExecuteReader();
            while(myReader.Read())
            {
                GetReaderCount = int.Parse(myReader.GetValue(0).ToString());                
            }
            myReader.Close();
            totalpage = (GetReaderCount/8);
            if(nextpage == null)
            { 
                Session["absPage"] = 1;
                nextpage = "1";
            }
            else
            { 
                if(int.Parse(nextpage) > 0)
                {
                    Session["absPage"] = int.Parse(Session["absPage"].ToString()) - 1;
                }
                if(int.Parse(nextpage) < 0)
                {
                    Session["absPage"] = int.Parse (Session["absPage"].ToString()) + 1;
                }
            }
            Response.Write("第" + Session["absPage"].ToString() + "页,共" + totalpage.ToString() + "页:"+"<br/>");
            Response.Write("------------------------"+"<br/>");
            
            mySelectQuery = "select * from Orders order by OrderID desc";
            myCommand = new SqlCommand(mySelectQuery, myConnection);
            myReader = myCommand.ExecuteReader();
 
            while(myReader.Read())
            {
                icount += 1;
                if(icount > pagesize) 
                {
                    icount = 1;
                    AbsolutePage += 1;
                }
                i += 1;
                nostr = myReader["OrderID"].ToString();
                brandstr = myReader["CustomerID"].ToString();

                if(int.Parse(Session["absPage"].ToString()) == AbsolutePage)
                {                
                    PrintALinkBR("Result.aspx?par1=" + nostr, i.ToString() + ":" + brandstr);
                    Hasnext = false;
                }
                else
                {
      
                    Hasnext = true;
                    
                }

            }
            myReader.Close();
            myConnection.Close();
            Response.Write("共" + i.ToString() + "条信息"+"<br/>");

            icount = 0;
            AbsolutePage = 1;
            if(Hasnext)
            {
                PrintALinkBR("WebForm2.aspx?par1=&amp;nextpage=" + lastnum.ToString(), "下一页");
            }
            if(int.Parse(Session["absPage"].ToString()) > 1)
            {
                PrintALinkBR("WebForm2.aspx?par1=&amp;nextpage=" + nextnum.ToString(), "上一页");
            }

    }


        public void PrintALinkBR(string sHref,string sText)
        {
            
            Response.Write("<a title='确定' href='" + sHref + "'>" + sText + "</a><br/>");
        }

（二）在DataGrid中实现分页功能

实现功能：页面中加入DataGrid，对DataGrid实现分页功能。（添加SqlConnection和SqlCommand控件）

using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design; 
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;


namespace DataGridPage
{
    /**//// <summary>
    /// WebForm1 的摘要说明。
    /// </summary>
    public class WebForm1 : System.Web.UI.Page
    {
        protected System.Data.SqlClient.SqlConnection sqlConnection1;
        protected System.Data.SqlClient.SqlCommand cmdNext;
        protected System.Data.SqlClient.SqlCommand cmdPrevious;
        protected System.Web.UI.WebControls.DataGrid DataGrid1;
        protected System.Web.UI.WebControls.LinkButton btnPrevious;
        protected System.Web.UI.WebControls.LinkButton btnNext;
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
        protected System.Web.UI.WebControls.TextBox text1;

        private int CurrentPage;

    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            // Put user code to initialize the page here
            if (!Page.IsPostBack)
            {
                cmdNext.Parameters["@customerid"].Value = "";
                CurrentPage = 0;
                FillGrid(cmdNext);
            }

        }

        private void FillGrid(System.Data.SqlClient.SqlCommand currentSqlCommand)
        {
            System.Data.SqlClient.SqlDataReader dr;
            sqlConnection1.Open();
            dr = currentSqlCommand.ExecuteReader();
            DataGrid1.DataSource = dr;
            DataGrid1.DataBind();
            dr.Close();
            sqlConnection1.Close();
            ViewState["CurrentPage"] = CurrentPage;
            ViewState[CurrentPage.ToString()] = DataGrid1.Items[0].Cells[0].Text;
            // Determine how many rows were filled into the grid. If it is less
            // than the number of rows per page, there are no more rows in the 
            // table, and the Next button should be disabled.
            if (DataGrid1.Items.Count < DataGrid1.PageSize)
            {
                btnNext.Enabled = false;
            }
        }

        //下一页
        private void btnNext_Click(object sender, System.EventArgs e)
        {
            // Get the page number of the page most recently displayed
            CurrentPage = (int)(ViewState["CurrentPage"]);
            CurrentPage++;
            // Gets the id on current page
            string lastid = DataGrid1.Items[9].Cells[0].Text;
            cmdNext.Parameters["@customerid"].Value = lastid;
            FillGrid(cmdNext);
        }


        //上一页
        private void btnPrevious_Click(object sender, System.EventArgs e)
        {
            btnNext.Enabled = true;
            CurrentPage = (int)(ViewState["CurrentPage"]);
            CurrentPage--;
            if (CurrentPage >= 0) 
            {
                string firstid;
                firstid = (string)(ViewState[CurrentPage.ToString()]);
                cmdPrevious.Parameters["@customerid"].Value = firstid;
                FillGrid(cmdPrevious);
            }
        }



        



        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.sqlConnection1 = new System.Data.SqlClient.SqlConnection();
            this.cmdNext = new System.Data.SqlClient.SqlCommand();
            this.cmdPrevious = new System.Data.SqlClient.SqlCommand();
            this.btnPrevious.Click += new System.EventHandler(this.btnPrevious_Click);
            this.btnNext.Click += new System.EventHandler(this.btnNext_Click);
            // 
            // sqlConnection1
            // 
            this.sqlConnection1.ConnectionString = "user id=sa;data source=localhost;initial catalog=Northwind;password=";
            // 
            // cmdNext
            // 
            this.cmdNext.CommandText = "SELECT TOP 10 CustomerID, CompanyName, City FROM Customers WHERE (CustomerID > @c" +
                "ustomerid) ORDER BY CustomerID";
            this.cmdNext.Connection = this.sqlConnection1;
            this.cmdNext.Parameters.Add(new System.Data.SqlClient.SqlParameter("@customerid", System.Data.SqlDbType.NVarChar, 5, "CustomerID"));
            // 
            // cmdPrevious
            // 
            this.cmdPrevious.CommandText = "SELECT TOP 10 CustomerID, CompanyName, City FROM Customers WHERE (CustomerID >= @" +
                "customerid) ORDER BY CustomerID";
            this.cmdPrevious.Connection = this.sqlConnection1;
            this.cmdPrevious.Parameters.Add(new System.Data.SqlClient.SqlParameter("@customerid", System.Data.SqlDbType.NVarChar, 5, "CustomerID"));
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
    }
}