ModifyImage.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient; 

public partial class ModifyImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            SqlConnection imageConnect = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlcon"].ToString());
            imageConnect.Open();
            DataSet ds=new DataSet();
            SqlDataAdapter sdr=new SqlDataAdapter(" select * from Category  ",imageConnect);
            sdr.Fill(ds);
            DropDownList1.DataSource = ds;
            DropDownList1.DataTextField = "name";
            DropDownList1.DataValueField = "id";
            DropDownList1.DataBind();
            imageConnect.Close();
        
        
        
        }

    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
    protected void BulletedList1_Click(object sender, BulletedListEventArgs e)
    {
        SqlConnection imageConnect = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlcon"].ToString());
        imageConnect.Open();
        SqlCommand imageCommand = new SqlCommand("select * from Photo where ID=" + BulletedList1.Items[e.Index].Value.ToString(), imageConnect);
        SqlDataReader imageReader = imageCommand.ExecuteReader();
        if (imageReader.Read())
        {
            ViewState["PhotoID"] = imageReader["ID"].ToString();
            TextBox1.Text = imageReader["Title"].ToString();
            TextBox2.Text = imageReader["PhotoText"].ToString();
            Image1.ImageUrl = imageReader["Url"].ToString();
            Image1.Visible = true;
        }
        imageConnect.Close();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (ViewState["PhotoID"] == null)
        {
            Page.RegisterStartupScript("err1", "<script>alert('尚未选择数据，不能进行更新！')</script>");