?using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            this.Label2.Text = "";

        }

    }
  
    protected void Button3_Click(object sender, EventArgs e)
    {
        this.TextBox1.Text = "";
        this.TextBox2.Text = "";
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection("Server=.;Database=物流公司貨運管理;uid=sa;pwd=;");
        con.Open();
        SqlCommand cmd = new SqlCommand("select count(*) from 用戶表 where 用戶編號 ='" +TextBox1.Text + "' and 密碼='" + TextBox2.Text + "'", con);
        int count = Convert.ToInt32(cmd.ExecuteScalar());
        if (count > 0)
        {
            Response.Redirect("main.aspx");
        }
        else 
        {
            this.Label2.Text = "用戶名或密碼不正確，登錄失敗！！！";
        }
    }
    protected void TextBox2_TextChanged(object sender, EventArgs e)
    {
        int len = ((TextBox)sender).Text.Length;
        if (len < 6 || len > 20)
            this.Label2.Text = "密碼必須在6位數字和20位數字之間！"; 
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Redirect("wangjimima.aspx");
    }
}