ASP.NET 登录界面
//default.aspx.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Runtime.InteropServices;
using System.Configuration;
using System.Web.UI.WebControls;
using System.Web.Services.Description;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Button4.Attributes.Add("onclick", "window.open('Register.aspx')");//通过button4打开链接
string strConnection = ConfigurationManager.AppSettings["Str.Properties.Settings.masterConnectionString"].ToString();
SqlConnection objConnection = new SqlConnection(strConnection);
objConnection.Open();
SqlCommand cmd = new SqlCommand("select * from judging where name='" + TextBox1.Text.Trim() + "'", objConnection);
string sql = "select * from judging where name='" + TextBox1.Text + "'and password='" + TextBox2.Text + "'";
cmd.CommandText = sql;
/*
***********************************************************************************************
*判断是否有此ID,ExecuteScalar() return the first column of the first row in the result set.
*/
if (cmd.ExecuteScalar() == null)//无此用户
{
Label1.Text = "Sorry, please check your id and psw";
Button3.Visible = false;
}
else
{
Label1.Text ="Welcome to "+TextBox1.Text;
Button3.Visible = true;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Panel1.Visible = false;
Panel2.Visible = true;
}
protected void Button4_Click(object sender, EventArgs e)
{
}
protected void Button3_Click(object sender, EventArgs e)
相关文档：
网上找到的一个办法，也可以解决 用回车键代替提交按钮时，用户常按回车（非常快速的点回车）导致重复提交的情况：
public class SubmitOncePage : System.Web.UI.Page
{
private string _strSessionKey;
&n ......
//压缩
protected void btnY_Click(object sender, EventArgs e)
{
string rar;
RegistryKey reg;
string args;
ProcessStartInfo procStart;
Process process;
try
{
reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\Shell\Open\Command"); ......
解决办法：app_code/ 存放一个类 用来截获HTTP
1.代码如下
using System;
using System.IO;
using System.Web;
using System.Text;
using System.Text.RegularExpressions;
/// <summary>
/// Removes whitespace from the webpage.
/// </summary>
public class ViewstateModule : IHttpModule
{
......
<script language="javascript" type="text/javascript">
function doubleSalary()
{
var employee = new Object();
employee.FirstName = "X";
employee.LastName = "PP";
employee.Salary = 1000;
......
