admin/login.aspx.cs

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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)
    {
        
    }
    protected void ibut_Login_Click(object sender, ImageClickEventArgs e)
    {

        string name = this.txtName.Text;
        string password = this.txtPwd.Text;


        SqlConnection conn = new SqlConnection(SqlHelper.connstring);

        string sql = string.Format("select count(*) from tb_Admin where [AdminName]='{0}' and AdminPwd='{1}'", name, password);
        SqlCommand comm = new SqlCommand(sql, conn);
        conn.Open();
        int i = (int)comm.ExecuteScalar();
        conn.Close();
        if (Session["CheckCode"].ToString().ToLower() == this.txtVaild.Text.ToLower())
        {
            if (i != 0)
            {
                Session["admin"] = this.txtName.Text;
                //创建身份验证票
                FormsAuthentication.SetAuthCookie(this.txtName.Text, false);
                //判断是否是返回回来的页面
                if (string.IsNullOrEmpty(Request.QueryString["ReturnUrl"]))
                {
                    Response.Redirect("MainPage.aspx");
                }
                else
                {
                    Alert.AlertAndRedirect("帐号或密码错误", "Login.aspx");
                }

            }
        }
        else
        {
            Alert.AlertAndRedirect("验证码错误", "Login.aspx");
        }
    }
}