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Let's take a look at whether this is A. NET Vulnerability or a program problem. I didn't know it for a moment, but I only knew it was a strange problem.

Source: Internet
Author: User
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CodeAs follows:

1.Webform1.aspx

<% @ Page Language = "C #" codebehind = "webform1.aspx. cs" autoeventwireup = "false" inherits = "webapplication4.webform1" %>

<! Doctype HTML public "-// W3C // dtd html 4.0 transitional // en">

<HTML>

<Head>

<Title> webform1 </title>

<Meta name = "generator" content = "Microsoft Visual Studio. NET 7.1">

<Meta name = "code_language" content = "C #">

<Meta name = "vs_defaultclientscript" content = "JavaScript">

<Meta name = "vs_targetschema" content = "http://schemas.microsoft.com/intellisense/ie5">

<Script language = "JavaScript">

Function AA ()

{

// Document. All. label1.innerhtml = "OK ";

// Alert ("AA ");

Document. getelementbyid ('button2'). Click ();

}

</SCRIPT>

</Head>

<Body ms_positioning = "gridlayout">

<Form ID = "form1" method = "Post" runat = "server">

<Font face ="">

<Asp: Label id = "label1" style = "Z-INDEX: 101; left: 304px; position: absolute; top: 64px" runat = "server"> </ASP: Label>

<Asp: button id = "button1" style = "Z-INDEX: 102; left: 360px; position: absolute; top: 136px" runat = "server"

TEXT = "button1"> </ASP: button>

<Asp: button id = "button2" style = "Z-INDEX: 103; left: 320px; position: absolute; top: 208px" runat = "server"

TEXT = "button2"> </ASP: button> </font>

</Form>

</Body>

</Html>

2.Webform1.aspx. CS

InPage_load

Private VoidPage_load (ObjectSender, system. eventargs E)

{

If(! Ispostback)

{

This. Button1.attributes. Add ("onclick", "AA ()");

}

}

 

Add eventButton2

Private VoidButton2_click (ObjectSender, system. eventargs E)

{

This. Label1.text = "OK ";

}

Code is very simple
Running result

Click "Button1" Button , In Button2 Add a breakpoint to the event as follows:


YesButton2Event (it should be said thatLabel1The value is"OK")

But the result is

I don't know why label1 is empty. Can someone explain it ??
Source code:

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