admin/login.aspx.cs

微信扫码关注公众号，代码整理好后第一时间通知你。

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;

namespace 作业.admin
{
    public partial class login : System.Web.UI.Page
    {
        static string connstr = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];//定义静态链接数据库参数
        SqlConnection Conn = new SqlConnection(connstr);//定义连接SQL数据库连接对象conn
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            this.txt_admin.Text = "";
            this.txt_password.Text = "";
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            //
            if (this.txt_admin.Text == "" || this.txt_password.Text == "")
            {
                Response.Write("<script language=javascript>alert('请填写帐号和密码！');location='javascript:history.go(-1)'</script>");
            }
            else
            {
                string sql = "select * from adminuser where adminuser='"+this.txt_admin.Text+"' and password='"+this.txt_password.Text+"'";
                SqlCommand cmd = new SqlCommand(sql, Conn);//创建一个command对象，装载的参数分别是SQL语句和一个连接对象Conn
                SqlDataAdapter da = new SqlDataAdapter();//建立一个数据连接器
                da.SelectCommand = cmd;//da的选择COMMAND对象是cmd
                DataSet ds = new DataSet();//建立一个dataset
                da.Fill(ds, "admin");//数据适配器向ds中装载表depart
                DataTable dt = ds.Tables["admin"];//建立一个datatable对象dt,他的实例是da中的表dapart;
                int count = dt.Rows.Count;
                if (count == 0)
                {
                    Response.Write("<script language=javascript>alert('帐号密码不正确！');</script>");
                }
                else
                {
                    Session["admin"] ="admin";
                    Response.Redirect("index.aspx");
                }
            }
            //
        }
    }
}