Admin/login.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;

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

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox2.Value.ToString().Trim() == "" || TextBox1.Value.ToString().Trim() == "")
        {
            Response.Write("<script>javascript:alert('请输入完整');history.back();</script>");
            Response.End();
        }
        string sql;
        sql = "";

        sql = "select * from users where uname='" + TextBox1.Value.ToString().Trim() + "' and upwd='" + TextBox2.Value.ToString().Trim() + "'";


        DataSet result = ClassDB.GetDataSet(sql);
        if (result != null)
        {
            if (result.Tables[0].Rows.Count > 0)
            {
                Session["uname"] = TextBox1.Value.ToString().Trim();
                Response.Redirect("main.aspx");
            }
            else
            {
                Response.Write("<script>javascript:alert('对不起，用户名或密码不正确!');history.back();</script>");
            }
        }
        else
        {
            Response.Write("<script>javascript:alert('对不起，系统错误，请不要越权操作!');</script>");
        }
    }
}