Default2.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;

public partial class Default2 : System.Web.UI.Page
{
    static ArrayList photoUrl = new ArrayList();
    static int count = 0;
    protected void Page_Init(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["sqlcon"].ConnectionString;
            SqlConnection con = new SqlConnection(connectionString);
            con.Open();
            string sqlcon = "select Url from Photo where CategoryID='" + Request.QueryString["CategoryID"] + "'";
            SqlCommand cmd = new SqlCommand(sqlcon, con);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                photoUrl.Add(dr.GetValue(0).ToString());
            }
            Image1.ImageUrl = photoUrl[count].ToString();
            con.Close();
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        Msgs.InnerText = "";
    }
    protected void Page_Dispose(object sender, EventArgs e)
    {
        count = 0;
        photoUrl.Clear();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        count++;
        if (count < (photoUrl.Count) && count >= 0)
        {
            Msgs.InnerText = count.ToString();            
            Image1.ImageUrl = photoUrl[count].ToString();
        }
        else
            Msgs.InnerText = "这是最后一张";
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        count--;
        if (count >= 1)
        {            
            Image1.ImageUrl = photoUrl[count].ToString();
        }