login.aspx.cs

电子通讯录系统

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 Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    /// <summary>
    /// 登录按钮单击事件
    /// </summary>
    protected void ButtonLogin_Click(object sender, EventArgs e)
    {
        SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["DBConnectionString"]); //创建连接对象
        SqlCommand cmd = new SqlCommand("select * from Users where userId='" + txtUserName.Text + "'", conn); //创建查询用户名是否存在数据对象
        try
        {
            conn.Open();  //打开连接
            SqlDataReader sdr = cmd.ExecuteReader();
            if (sdr.Read())  //如果用户名输入正确
            {
                if (sdr["userPwd"].ToString() == txtPassword.Text)//密码正确
                {
                    conn.Close();
                    Session["userID"] = txtUserName.Text.Trim();//存储用户名
                    Response.Redirect("AddressList.aspx");  //进入系统
                }
                else
                {
                    Response.Write("<script language=javascript>alert('您输入的密码错误！')</script>");
                }
            }
            else
            {
                Response.Write("<script language=javascript>alert('您输入的用户名错误或该用户名不存在！')</script>");
            }
        }
        catch (System.Exception ee)
        {
            Response.Write("<script language=javascript>alert('" + ee.Message.ToString() + "')</script>");
        }
        finally
        {
            conn.Close();
        }
    }
}