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前台代码：
<head>
<title></title>
<style type="text/css">
body {font:12px Helvetica, Arial, sans-serif; margin:100px auto; padding:0; word-wrap:break-word; word-break:break-all; background-color:#016BA9;}
.login1{background-p_w_picpath: url(../Images/login_1.jpg); width:960px; height:94px; margin:0 auto;}
.login2{background-p_w_picpath: url(../Images/login_2.jpg); width:960px; height:49px; margin:0 auto; }
.login3{background-p_w_picpath: url(../Images/login_3.jpg); width:960px; height:125px; margin:0 auto;}
.login4{background-p_w_picpath: url(../Images/login_4.jpg); width:960px; height:91px; margin:0 auto;}
.loginTXT{border: 1px solid #800000; width:150px; background-color:#866961; color:#fff; height:19px;}
</style>
<script type="text/javascript">
if (top.location != self.location)
top.location = self.location;
function CheckIn() {
var names = document.getElementById("txtU_Name").value;
var pass = document.getElementById("txtU_Pass").value;
var check = document.getElementById("txtU_Check").value;
if (names == "") {
alert("请输入用户名...");
document.getElementById("txtU_Name").focus();
return false;
}
else if (pass == "") {
alert("请输入用户密码...");
document.getElementById("txtU_Pass").focus();
return false;
}
else if (check == "") {
alert("请输入验证码...");
document.getElementById("txtU_Check").focus();
return false;
}
}
</script>
</head>
<body>
<form id="form1" runat="server" defaultfocus="txtU_Name" defaultbutton="BtnLogin">
<div class="login1"></div>
<div class="login2"></div>
<div class="login3">
<table cellpadding="0" cellspacing="1" border="0" style="margin-left:320px; width:300px;">
<tr>
<td>用户名称：</td>
<td> <asp:textbox ID="txtU_Name" runat="server" class="loginTXT" maxlength="20"></asp:textbox></td>
</tr>
<tr>
<td>用户密码：</td>
<td> <input id="txtU_Pass" type="password" runat="server" class="loginTXT" maxlength="6"/></td>
</tr>
<tr>
<td>验证代码：</td>
<td><asp:textbox ID="txtU_Check" runat="server" class="loginTXT" style="width:85px;" maxlength="5"/> <img src="../VateImage.ashx" onclick="this.src='../VateImage.ashx?'+ new Date().getTime()" alt="看不清楚再换一张！" style="vertical-align:middle;"/></td>
</tr>
<tr>
<td colspan="2"><hr /></td>
</tr>
<tr>
<td></td>
<td>
<asp:button ID="BtnLogin" runat="server" text="登录管理" OnClientClick="return CheckIn()" onclick="BtnLogin_Click" />
<asp:button ID="BtnHome" runat="server" text="返回首页"
onclick="BtnHome_Click" />
</td>
</tr>
</table>
</div>
<div class="login4"></div>
</form>
</body>
</html>
后台代码：
protected void BtnLogin_Click(object sender, EventArgs e)
{
string username = txtU_Name.Text;
string pwd = txtU_Pass.Value;
string check = txtU_Check.Text;
if (CheckNull())
{
if (check.ToString().ToLower() == Session["ValidateCode"].ToString().ToLower())
{
string strsql = "select count(1) from Login where UserName='" + username + "' and UserPwd='" + pwd + "'";
object obj = SqlHelper.ExecuteScalar(ConfigurationManager.ConnectionStrings["conn"].ToString(), CommandType.Text, strsql);
if (obj != null && (int)obj > 0)
{
Response.Write("<script> alert('登录成功！')</script>");
Session["username"] = username;
HttpCookie hc = new HttpCookie("username", username);
hc.Expires = DateTime.Now.AddMinutes(1);
Response.Cookies.Add(hc);
Response.Redirect("Main.aspx");
}
else
{
Response.Write("<script> alert('用户名或密码错误！')</script>");
Response.Write("<script>window.location.href='Login.aspx'</script>");
}
}
else
{
Response.Write("<script> alert('验证码错误！')</script>");
Response.Write("<script>window.location.href='Login.aspx'</script>");
}
}
}
private bool CheckNull()
{
return (!(string.IsNullOrEmpty(txtU_Name.Text.Trim())) && !(string.IsNullOrEmpty(txtU_Pass.Value.Trim())) && !(string.IsNullOrEmpty(txtU_Check.Text.Trim()))) ? true : false;
}
main主页代码：page_Load
try
{
string username = Session["username"].ToString();
}
catch
{
Response.Write("<script>alert('请从主页面登录！');location.href='Login.aspx';</script>");
}
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