后台C#代码
1using System;
2using System.Collections;
3using System.ComponentModel;
4using System.Data;
5using System.Drawing;
6using System.Web;
7using System.Web.SessionState;
8using System.Web.UI;
9using System.Web.UI.WebControls;
10using System.Web.UI.HtmlControls;
11using System.Data.SqlClient;
12namespace Ado.net
13{
14 /**//// <summary>
15 /// WebForm1 的摘要说明。
16 /// </summary>
17 public class WebForm1 : System.Web.UI.Page
18 {
19 protected System.Web.UI.WebControls.TextBox TextBox1;
20 protected System.Web.UI.WebControls.TextBox TextBox2;
21 protected System.Web.UI.WebControls.Button Button1;
22 protected System.Web.UI.WebControls.Button Button2;
23
24 private void Page_Load(object sender, System.EventArgs e)
25 {
26 // 在此处放置用户代码以初始化页面
27 }
28
29 Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
30 override protected void OnInit(EventArgs e)
31 {
32 //
33 // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
34 //
35 InitializeComponent();
36 base.OnInit(e);
37 }
38
39 /**//// <summary>
40 /// 设计器支持所需的方法 - 不要使用代码编辑器修改
41 /// 此方法的内容。
42 /// </summary>
43 private void InitializeComponent()
44 {
45 this.Button1.Click += new System.EventHandler(this.Button1_Click);
46 this.Button2.Click += new System.EventHandler(this.Button2_Click);
47 this.Load += new System.EventHandler(this.Page_Load);
48
49 }
50 #endregion
51
52 private SqlConnection con()
53 {//下面有调用几次这个,所以就做个方法,呵呵,没有意见吧
54 SqlConnection con=new SqlConnection("server=.;database=voteone;uid=sa;pwd=980123;");
55 return con;
56 }
57 private void Button1_Click(object sender, System.EventArgs e)
58 {
59 SqlConnection con=this.con();
60 con.Open();
61 SqlCommand cmd=new SqlCommand("select * from admin where name='"+TextBox1.Text+"' and pwd='"+TextBox2.Text+"'",con);
62 SqlDataReader sdr=cmd.ExecuteReader();
63 if(sdr.Read())
64 {//这个成功不需要输入密码或者连用户名都不用输入就可以得到
65 //例如你在第第一个文本框里输入 thc '-- (这个是假设我们知道用户名是thc)或者 ' or 1=1-- (这个更厉害了,更本就不需要知道什么,重要知道 1=1就可以了)
66 Response.Write("登陆成功");
67 }
68 else
69 {
70 Response.Write("失败");
71 }
72 }
73
74 private void Button2_Click(object sender, System.EventArgs e)
75 {//下面方法主要是使用了Replace关键字把传近来的字符中的 单引号给替换了('),其他没有什么,呵呵
76 SqlConnection con=this.con();
77 con.Open();
78 SqlCommand cmd=new SqlCommand("select * from admin where name='"+TextBox1.Text.Replace("'","''")+"' and pwd='"+TextBox2.Text.Replace("'","''")+"'",con);
79 SqlDataReader sdr=cmd.ExecuteReader();
80 if(sdr.Read())
81 {
82 Response.Write("登陆成功");
83 }
84 else
85 {
86 Response.Write("失败");
87 }
88 }
89 }
90}
91
1using System;
2using System.Collections;
3using System.ComponentModel;
4using System.Data;
5using System.Drawing;
6using System.Web;
7using System.Web.SessionState;
8using System.Web.UI;
9using System.Web.UI.WebControls;
10using System.Web.UI.HtmlControls;
11using System.Data.SqlClient;
12namespace Ado.net
13{
14 /**//// <summary>
15 /// WebForm1 的摘要说明。
16 /// </summary>
17 public class WebForm1 : System.Web.UI.Page
18 {
19 protected System.Web.UI.WebControls.TextBox TextBox1;
20 protected System.Web.UI.WebControls.TextBox TextBox2;
21 protected System.Web.UI.WebControls.Button Button1;
22 protected System.Web.UI.WebControls.Button Button2;
23
24 private void Page_Load(object sender, System.EventArgs e)
25 {
26 // 在此处放置用户代码以初始化页面
27 }
28
29 Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
30 override protected void OnInit(EventArgs e)
31 {
32 //
33 // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
34 //
35 InitializeComponent();
36 base.OnInit(e);
37 }
38
39 /**//// <summary>
40 /// 设计器支持所需的方法 - 不要使用代码编辑器修改
41 /// 此方法的内容。
42 /// </summary>
43 private void InitializeComponent()
44 {
45 this.Button1.Click += new System.EventHandler(this.Button1_Click);
46 this.Button2.Click += new System.EventHandler(this.Button2_Click);
47 this.Load += new System.EventHandler(this.Page_Load);
48
49 }
50 #endregion
51
52 private SqlConnection con()
53 {//下面有调用几次这个,所以就做个方法,呵呵,没有意见吧
54 SqlConnection con=new SqlConnection("server=.;database=voteone;uid=sa;pwd=980123;");
55 return con;
56 }
57 private void Button1_Click(object sender, System.EventArgs e)
58 {
59 SqlConnection con=this.con();
60 con.Open();
61 SqlCommand cmd=new SqlCommand("select * from admin where name='"+TextBox1.Text+"' and pwd='"+TextBox2.Text+"'",con);
62 SqlDataReader sdr=cmd.ExecuteReader();
63 if(sdr.Read())
64 {//这个成功不需要输入密码或者连用户名都不用输入就可以得到
65 //例如你在第第一个文本框里输入 thc '-- (这个是假设我们知道用户名是thc)或者 ' or 1=1-- (这个更厉害了,更本就不需要知道什么,重要知道 1=1就可以了)
66 Response.Write("登陆成功");
67 }
68 else
69 {
70 Response.Write("失败");
71 }
72 }
73
74 private void Button2_Click(object sender, System.EventArgs e)
75 {//下面方法主要是使用了Replace关键字把传近来的字符中的 单引号给替换了('),其他没有什么,呵呵
76 SqlConnection con=this.con();
77 con.Open();
78 SqlCommand cmd=new SqlCommand("select * from admin where name='"+TextBox1.Text.Replace("'","''")+"' and pwd='"+TextBox2.Text.Replace("'","''")+"'",con);
79 SqlDataReader sdr=cmd.ExecuteReader();
80 if(sdr.Read())
81 {
82 Response.Write("登陆成功");
83 }
84 else
85 {
86 Response.Write("失败");
87 }
88 }
89 }
90}
91
前台HTML代码
1<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="Ado.net.WebForm1" %>
2<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
3<HTML>
4 <HEAD>
5 <title>WebForm1</title>
6 <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
7 <meta name="CODE_LANGUAGE" Content="C#">
8 <meta name="vs_defaultClientScript" content="JavaScript">
9 <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
10 </HEAD>
11 <body MS_POSITIONING="GridLayout">
12 <form id="Form1" method="post" runat="server">
13 <asp:TextBox id="TextBox1" style="Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 80px" runat="server"></asp:TextBox>
14 <asp:TextBox id="TextBox2" style="Z-INDEX: 102; LEFT: 32px; POSITION: absolute; TOP: 120px" runat="server"></asp:TextBox>
15 <asp:Button id="Button1" style="Z-INDEX: 103; LEFT: 32px; POSITION: absolute; TOP: 160px" runat="server"
16 Text="有漏洞"></asp:Button>
17 <asp:Button id="Button2" style="Z-INDEX: 104; LEFT: 120px; POSITION: absolute; TOP: 160px" runat="server"
18 Text="修改后"></asp:Button>
19 </form>
20 </body>
21</HTML>
22
1<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="Ado.net.WebForm1" %>
2<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
3<HTML>
4 <HEAD>
5 <title>WebForm1</title>
6 <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
7 <meta name="CODE_LANGUAGE" Content="C#">
8 <meta name="vs_defaultClientScript" content="JavaScript">
9 <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
10 </HEAD>
11 <body MS_POSITIONING="GridLayout">
12 <form id="Form1" method="post" runat="server">
13 <asp:TextBox id="TextBox1" style="Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 80px" runat="server"></asp:TextBox>
14 <asp:TextBox id="TextBox2" style="Z-INDEX: 102; LEFT: 32px; POSITION: absolute; TOP: 120px" runat="server"></asp:TextBox>
15 <asp:Button id="Button1" style="Z-INDEX: 103; LEFT: 32px; POSITION: absolute; TOP: 160px" runat="server"
16 Text="有漏洞"></asp:Button>
17 <asp:Button id="Button2" style="Z-INDEX: 104; LEFT: 120px; POSITION: absolute; TOP: 160px" runat="server"
18 Text="修改后"></asp:Button>
19 </form>
20 </body>
21</HTML>
22