login.aspx.cs

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

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public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }



    protected void btregister_Click(object sender, EventArgs e)
    {
        Response.Redirect("register.aspx");
    }
    protected void btlogin_Click(object sender, EventArgs e)
    {
        if (tname.Text == string.Empty && tpass.Text == string.Empty)
        {
            Response.Write("<script>alert('用户名与密码都不能为空！！')</script>");
        }
        else
        {
            SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
            conn.Open();
            string cmdtname = "select name from [User] where name='"+tname.Text+"'";
            SqlCommand cmd = new SqlCommand(cmdtname,conn);
            
            SqlDataReader drname = cmd.ExecuteReader();
            if (drname.Read())//读取用户名
            {
                conn.Close();
                SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
                con.Open();
                string cmdtpass = "select pass from [User] where pass='"+tpass.Text+"'";
                SqlCommand cmdpass = new SqlCommand(cmdtpass, con);
                SqlDataReader drpass = cmdpass.ExecuteReader();
                if (drpass.Read())//读取密码
                {
                    con.Close();
                    mima();
                }
                else
                {
                    if (tpass.Text == string.Empty)//判断密码是否为空
                    {
                        Response.Write("<script>alert('密码不能为空！！')</script>");