login

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;

public partial class userLogin : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Session["username"] != null)
{
Response.Redirect("BookBrief.aspx");
}
}
protected void Button2_Click(object sender, EventArgs e)
{
if (txtName.Text.Trim() == "" || txtPwd.Text.Trim() == "")
{
Response.Write("<script>alert('登录名和密码不能为空！');location='javascript:history.go(-1)';</script>");
return;
}
else
{
int i=0;
i = (int)SqlHelper.ExecuteScalar("select count(*) from Member where Name=@Name and Password=@Password", new SqlParameter("@Name", txtName.Text), new SqlParameter("@Password", txtPwd.Text));

if(i > 0)
{
Response.Write("<script>alert('登录成功！');</script>");
if (CB.Checked == true)
{
Response.Write("<script>alert('已经选中');</script>");
}
Session["username"] = txtName.Text;
Response.Redirect("BookBrief.aspx");
}
else
{
Response.Write("<script>alert('账户或密码有错误！');</script>");
}
}

}
}