Essay/EssayIndex.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.SqlClient;
using System.Data;

namespace Essay
{
    public partial class EssayIndex : System.Web.UI.Page
    {
        public string sql = "Data Source=. ;Trusted_Connection=SSPI;Initial Catalog=Essay";
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void BtnLogIn_Click(object sender, EventArgs e)
        {
            string stdnum = this.txtNum.Text.Trim();
            SqlConnection conn = new SqlConnection(sql);
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "Select * from Authors where StdNum='"+stdnum+"'";
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            if (dr.HasRows)
            {
                string password = dr["Password"].ToString();
                string code = dr["Code"].ToString();
                Session["AuthorID"] = dr["AuthorID"].ToString();//session相当于一个临时存储器
                if (password == txtPassword.Text && code == txtCodeNum.Text)
                {
                    Response.Redirect("AuthorIndex.aspx");
                }
                else
                {
                    Response.Write("<Script>alert('密码或授权码不正确！')</Script>");
                }
                conn.Close();
            }
            else {
                Response.Write("<Script>alert('该学号不存在！')</Script>");
            }

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Response.Redirect("CodeForget.aspx");
        }
    }
}