Login.ascx.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;

public partial class Login : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session.Count > 0)
        {
            Panel1.Visible = false;
            Panel2.Visible = true;
            Label2.Text = Session["UserName"] + "欢迎光临";
        }
        else
        {
            Panel2.Visible = false;
            Panel1.Visible = true;
        }
    }
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        if (txtCheck.Text != Request.Cookies["CheckCode"].Value.ToString())
             Response.Write("<script>alert('验证码错误！')</script>");
        else
        {
            string strSQL="select * from UserInfo where UserName='" + txtUserName.Text + "' and UserPwd='" + txtUserPwd.Text + "'";

            if (MyClass.OfflineSelect(strSQL).Rows.Count > 0)
            {
                Session["UserName"] = txtUserName.Text;
                Label2.Text = txtUserName.Text + "欢迎光临";
                Panel1.Visible = false;
                Panel2.Visible = true;
            }
            else
                Response.Write("<script>alert('用户名或密码错误！')</script>");
        }
            
     }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("~/users/Register.aspx");
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        Response.Redirect("~/users/update.aspx");
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        Response.Redirect("~/users/Loginout.aspx");