一、前台显示效果
二、前台代码
三、后台代码
四、关于验证码可以本Blog的随笔中找到，地址为：
Asp.Net2.0下C#环境 Login控件实现用户登录
原文:Asp.Net2.0下C#环境
Login控件实现用户登录
<asp:Login ID="Login1" runat="server" BackColor="#F7F7DE" BorderColor="#CCCC99" BorderStyle="Solid"
BorderWidth="1px" Font-Names="Verdana" Font-Size="10pt" OnAuthenticate="Login1_Authenticate">
<TitleTextStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<LayoutTemplate>
<table border="0" cellpadding="1" cellspacing="0" style="border-collapse: collapse">
<tr>
<td>
<table border="0" cellpadding="0">
<tr>
<td align="center" colspan="2" style="font-weight: bold; color: white; background-color: #6b696b">
用户登录</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">用户名：</asp:Label></td>
<td>
<asp:TextBox ID="UserName" runat="server" CssClass="STYLE1"></asp:TextBox>
<asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName"
ErrorMessage="必须填写“用户名”。" ToolTip="必须填写“用户名”。" ValidationGroup="Login1">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">密码：</asp:Label></td>
<td>
<asp:TextBox ID="Password" runat="server" TextMode="Password" CssClass="STYLE1"></asp:TextBox>
<asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password"
ErrorMessage="必须填写“密码”。" ToolTip="必须填写“密码”。" ValidationGroup="Login1">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="right">
<asp:Label ID="Label1" runat="server" AssociatedControlID="Password">验证码：</asp:Label></td>
<td>
<asp:TextBox ID="GetCode" runat="server" CssClass="STYLE2"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="Password"
ErrorMessage="必须填写“验证码”。" ToolTip="必须填写“验证码”。" ValidationGroup="Login1">*</asp:RequiredFieldValidator><asp:Image ID="Image1" runat="server" ImageUrl="~/include/GetValidate.aspx" ImageAlign="Top"
alt="看不清？点击更换" onclick="this.src=this.src+‘?‘" />
</td>
</tr>
<tr>
<td align="center" colspan="2" style="color: red">
<asp:Literal ID="FailureText" runat="server" EnableViewState="False"></asp:Literal>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:Button ID="LoginButton" runat="server" CommandName="Login" Text="登录" ValidationGroup="Login1" /></td>
</tr>
</table>
</td>
</tr>
</table>
</LayoutTemplate>
</asp:Login>
protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
{
TextBox GetCode = Login1.FindControl("GetCode") as TextBox;//获取登陆控件中验证码文本框值
if (Request.Cookies["CheckCode"].Value == null)
{
Response.Write(@"<script language=JavaScript>{window.alert(‘您的浏览器设置已被禁用 Cookies，您必须设置浏览器允许使用 Cookies 选项后才能使用本系统！‘);}</script>");
return;
}
else
{
if (String.Compare(Request.Cookies["CheckCode"].Value, GetCode.Text.ToString().Trim(), true) != 0)
{
Response.Write(@"<script language=JavaScript>{window.alert(‘验证码输入不正确！‘);}</script>");
return;
}
string UserLoginID = Login1.UserName.ToString().Trim().Replace("‘", "").Replace("=", "");//得到输入的用户名
string UserLoginPwd = Login1.Password.ToString().Trim().Replace("‘", "").Replace("=", "");//得到输入的密码
//得到md5值
string md5Pwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(UserLoginPwd, "md5").ToLower();
string mySql = "select * from [User] where [sLoginID]=‘" + UserLoginID + "‘ and [LoginPWD]=‘" + md5Pwd + "‘";
//下面部署自己的逻辑处理，以下仅供参考
DBConn myDB = new DBConn();
try
{
SqlDataReader Rs = myDB.getDataReader(mySql);
if (!Rs.Read())
{
e.Authenticated = false;//登录不通过
}
else
{
Session["UserLoginID"] = UserLoginID;
Session["UserLoginPwd"] = UserLoginPwd;
e.Authenticated = true;//登录通过
Response.Redirect("index.aspx");
}
}
catch (Exception ex)
{
Response.Write("数据库错误，错误原因：" + ex.Message);
Response.End();
}
}
}
http://www.cnblogs.com/zm235/archive/2006/10/02/520233.html