UserControls/UserLogin.ascx.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;
using BookShop;

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

    }

	protected void LoginBtn_Click(object sender,ImageClickEventArgs e)
	{		
		if (UserName.Text == null || UserName.Text == "" || UserName.Text.Length <= 0)
		{
			ShowMessage("用户名称为空，请输入用户名称！");
			return;
		}

		if (Password.Text == null || Password.Text == "" || Password.Text.Length <= 0)
		{
			ShowMessage("用户密码为空，请输入用户密码！");
			return;
		}

		String userId = "";
		String roleId = "";

		///定义类并获取用户的登陆信息            
		BookShop.User user = new User();
		SqlDataReader recu = user.GetUserLogin(UserName.Text.Trim(),
			BookShop.User.Encrypt(Password.Text.Trim()));

		///判断用户是否合法
		if (recu.Read())
		{
			userId = recu["UserID"].ToString();
			roleId = recu["RoleID"].ToString();
		}
		recu.Close();

		///验证用户合法性，并跳转到系统平台
		if ((userId != null) && (userId != ""))
		{
			Session["UserID"] = userId;
			Session["UserName"] = UserName.Text;
			if (roleId != "")
			{
				Session["RoleID"] = roleId;
			}