AdminLogin.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;
public partial class AdminLogin : System.Web.UI.Page
{
    public string username;
    public string password;
    public string strpwd;
    SqlConnection conn = DB.getcon();
    protected void Page_Load(object sender, EventArgs e)
    {

        Session["UserName"] = null;
       
    }

   

  
    protected void Button1_Click(object sender, EventArgs e)
    {
        username = UserName.Value.Trim();
        password = UserPassword.Value.Trim();
        strpwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(UserPassword.Value.Trim(), "md5").ToString().ToLower().Substring(8, 16);

        if (username == String.Empty || password == String.Empty)
        {
            Response.Write("<script>");
            Response.Write("alert('管理名/密码 不能为空!!!');");
            Response.Write("</script>");
            return;
        }
        else
        {


            string mySql = "select * from admin where username='" + username + "' and pwd='" + strpwd+"'";
            conn.Open();
            SqlCommand cmd = new SqlCommand(mySql, conn);


            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.Read())
            {

                Session["UserName"] = username;
                
                Response.Redirect("Manage.aspx");
            }

            else
            {
                Response.Write("<script lanuage=javascript>alert('用户名或密码有误！');location='javascript:history.go(-1)'</script>");
                return;