一个简单的ASP.NET Forms 身份认证
类别: ASP.NET教程 
Web.config
<configuration>
<system.web>
<compilation debug=\"true\"/>
<authentication mode=\"Forms\">
<forms loginUrl=\"login.aspx\" name = \".ASPXFORMSAUTH\" />
</authentication>
<authorization>
<deny users=\"?\"/>
</authorization>
</system.web>
</configuration>
default.aspx
<HTML>
<HEAD>
<TITLE>首页</TITLE>
<script language=\"VB\" runat=\"server\">
Sub Page_Load(Sender As Object, e As EventArgs)
Message.Text = String.Format(\"你好，{0}\", Context.User.Identity.Name)
End Sub
sub btnSignout_Click(Sender as Object, E as EventArgs)
FormsAuthentication.SignOut()
Response.Redirect(\"login.aspx\")
end sub
</script>
</HEAD>
<BODY>
<asp:label id=\"Message\" runat=\"server\"/>
<br>
<form method=\"post\" runat=\"server\">
<asp:button id=\"btnSignout\" Text=\"退出登录\" runat=\"server\" OnClick=\"btnSignout_Click\"/>
</form>
</BODY>
</HTML>
login.aspx
<HEAD>
<TITLE>首页</TITLE>
<script lanugage=\"c#\" runat=\"server\">
private void Page_Load(object sender, EventArgs e)
{
if (Request.IsAuthenticated)
Response.Redirect(\"default.aspx\");
}
void btnLogin_Click(Object sender, EventArgs e)
{
if (txtUsername.Text != null && txtUsername.Text != String.Empty && txtPassword.Text != null && txtPassword.Text != String.Empty)
FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, true);
else
lblError.Text = \"错误的用户名/密码\";
}
</script>
</HEAD>
<BODY>
<form method=\"post\" runat=\"server\">
<asp:Label id=\"lblUsername\" runat=\"server\" Text=\"用户名：\"/>
<asp:Textbox id=\"txtUsername\" runat=\"server\"/>
<br>
<br>
<asp:Label id=\"lblPassword\" runat=\"server\" Text=\"密 码：\"/>
<asp:Textbox id=\"txtPassword\" runat=\"server\" TextMode=\"password\"/>
<br>
<asp:button id=\"btnLogin\" runat=\"server\" Text=\"登录\" OnClick=\"btnLogin_Click\" />
</form>
<hr>
<br>
<asp:Label id=\"lblError\" forecolor=\"red\" runat=\"server\"/>
</BODY>
</HTML>
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