用户名：<asp:TextBox ID="txtUserName" runat="server"></asp:TextBox> 
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtUserName" Display="Static">必填！</asp:RequiredFieldValidator><br />
密码：
<asp:TextBox ID="txtUserPass" runat="server" TextMode="Password"></asp:TextBox> 
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtUserPass" Display="Dynamic">必填！</asp:RequiredFieldValidator><br />

/// <summary>
/// 获取int数组的最大值
/// </summary>
/// <param name="intArray"></param>
/// <returns></returns>

use [MzwuCom_NewDataBaseName]
;

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Student]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1

/// <summary>
/// 返回已添加指定时间间隔的日期
/// </summary>
/// <param name="interval">表示要添加的时间类型</param>

Response.Write(Session["UserName"].ToString()); //System.NullReferenceException: 未将对象引用设置到对象的实例。
Response.Write(Convert.ToString(Session["UserName"]) == String.Empty); //True

/// <summary>
/// 职员类
/// </summary>
public class Personnel