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<h1>ASP.NET Web Forms</h1>
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<p class="intro">All server controls must appear within a <form> tag, and the <form> tag must
contain the runat="server" attribute.</p>
<hr />
<h2>ASP.NET Web Forms</h2>
<p>All server controls must appear within a <form> tag, and the <form> tag must
contain the runat="server" attribute. The runat="server" attribute
indicates that the form should be processed on the server. It also indicates
that the enclosed controls can be accessed by server scripts:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><form runat="server"></pre>
<pre>...HTML + server controls</pre>
<pre></form></pre></td></tr>
</table>
<p>
<b>Note:</b> The form is always submitted to the page itself. If you specify an
action attribute, it is ignored. If you omit the method attribute, it will be
set to method="post" by default. Also, if you do not specify the name and id
attributes, they are automatically assigned by ASP.NET.</p>
<p>
<b>Note:</b> An .aspx page can only contain ONE <form runat="server"> control!</p>
<p>
If you select view source in an .aspx page containing a form with no name,
method, action, or id attribute specified, you will see that ASP.NET has added
these attributes to the form. It looks something like this:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><form name="_ctl0" method="post" action="page.aspx" id="_ctl0"></pre>
<pre>...some code</pre>
<pre></form></pre></td></tr>
</table>
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<hr />
<h2>Submitting a Form</h2>
<p>
A form is most often submitted by clicking on a button. The Button server control
in ASP.NET has the
following format:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><asp:Button id="id" text="label" OnClick="sub" runat="server" /></pre>
</td></tr>
</table>
<p>
The id attribute defines a unique name for the button and the text attribute assigns a label
to the button. The onClick
event handler specifies a named subroutine to execute.</p>
<p>In the following example we declare a Button control in an .aspx file. A
button click runs a subroutine which changes the text on the button:</p>
<p><a target="_blank" href="showasp.asp@filename=demo_button">Example</a></p>
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