一、新建一个数据库
新建一个access数据user.mdb。
新建一个user表，添加：UserId（文本类型）及Password（文本类型）两个字段。
二、新建一个default.aspx文件。
在Web Form里：
加入两个Label控件,Text属性分别为“登录名”和“密码”；
加入两个TextBox控件,ID属性分别为“Userid”和“Pwd”，Text属性均为空；
加入两个RequiredFieldValidato控件，ID属性分别为“rfvUserid”和“rfvPwd”，Text属性分别为“请输入登录名！”和“请输入登录密码！”，ControlToValidate属性分别为"Userid"和"Pwd"；
加入一个Button控件,ID属性为“LogButton”，Text属性别为“登录”；
最后加入一个Label控件，ID属性为“Msg”。
Default.aspx源代码如下：
<％@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false" Inherits="lsj.WebForm1" ％>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="javascript (ECMAScript)">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<FONT face="宋体">
<form runat="server" ID="Form1">
<asp:Label id="Label1" style="Z-INDEX: 101; LEFT: 82px; POSITION: absolute; TOP: 39px" runat="server" Width="55px"
Height="26px">登录名</asp:Label>
<asp:Label id="Label2" style="Z-INDEX: 102; LEFT: 80px; POSITION: absolute; TOP: 84px" runat="server" Width="63px" Height="24px">密 码</asp:Label>
<asp:TextBox id="Userid" style="Z-INDEX: 103; LEFT: 161px; POSITION: absolute; TOP: 39px" runat="server" Width="109px" Height="25px"></asp:TextBox>
<asp:TextBox id="Pwd" style="Z-INDEX: 104; LEFT: 162px; POSITION: absolute; TOP: 81px" runat="server" Width="109px" Height="22px" TextMode="Password"></asp:TextBox>
<asp:Button id="LogButton" style="Z-INDEX: 105; LEFT: 79px; POSITION: absolute; TOP: 125px" runat="server" Width="59px" Height="25px" Text="登 录"></asp:Button>
<asp:Label id="Msg" style="Z-INDEX: 106; LEFT: 161px; POSITION: absolute; TOP: 130px" runat="server" Width="117px" Height="26px"></asp:Label>
<asp:RequiredFieldValidator id="RequiredFieldValidator1" style="Z-INDEX: 107; LEFT: 290px; POSITION: absolute; TOP: 43px" runat="server" Width="162px" Height="18px" ErrorMessage="RequiredFieldValidator" ControlToValidate="Userid">请输入登录名！</asp:RequiredFieldValidator>
<asp:RequiredFieldValidator id="RequiredFieldValidator2" style="Z-INDEX: 108; LEFT: 292px; POSITION: absolute; TOP: 83px" runat="server" Width="175px" Height="22px" ErrorMessage="RequiredFieldValidator" ControlToValidate="Pwd">请输入登录密码！</asp:RequiredFieldValidator>
</form>
</FONT>
</body>
</HTML>
三、编写default.aspx.cs文件。
双击LogButton，
１、加入using System.Data.OleDb;
２、先在class中声明：
public string strConnection;
OleDbConnection myConn;
３、加入数据库链接：
把下面代码加入“Page_Init(object sender, EventArgs e)”的“InitializeComponent();”后面.
string strConnection="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Server.MapPath(".")+"..\\user.mdb;";
myConn=new OleDbConnection(strConnection);
４、在LogButton_Click(object sender, System.EventArgs e)事件中加入下面的代码：
string userid,pwd;
userid=Userid.Text;
pwd=Pwd.Text;
string mySel="SELECT count(*) as iCount from user where UserID=""+userid+""";
OleDbCommand myCmd1=new OleDbCommand(mySel,myConn);
myCmd1.Connection.Open();
OleDbDataReader Dr1;
Dr1=myCmd1.ExecuteReader();
Dr1.Read();
string Count=Dr1["iCount"].ToString();
Dr1.Close();
myCmd1.Connection.Close();
string DrPwd,DrRoles;
if(Count!="0")
{
mySel="SELECT * from user where UserID=""+userid+""";
OleDbCommand myCmd=new OleDbCommand(mySel,myConn);
myCmd.Connection.Open();
OleDbDataReader Dr;
Dr=myCmd.ExecuteReader();
Dr.Read();
DrPwd=Dr["Password"].ToString();
Dr.Close();
if(DrPwd==pwd)
{
Session["logid"]=userid;
Response.Redirect("main.aspx");
}
else
Msg.Text="登录密码错.";
}
else
Msg.Text="没有这个用户.";
好了，全部工作已经完成，default.aspx.cs源代码如下：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
namespace lsj
{
/// <summary>
/// Summary description for WebForm1.
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Label Label2;
protected System.Web.UI.WebControls.TextBox Userid;
protec
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