Blog : ASP.NET Web Forms
ASP.NET Web Forms
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All server controls must appear within a <form> tag, and
the <form> tag must contain the runat="server" attribute.
ASP.NET Web Forms
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:
<form runat="server">
...HTML + server
controls
</form> |
Note: 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.
Note: An .aspx page can only contain ONE <form runat="server">
control!
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:
<form name="_ctl0" method="post" action="page.aspx"
id="_ctl0">
...some
code
</form> |
Submitting a Form
A form is most often submitted by clicking on a button. The Button server
control in ASP.NET has the following format:
| <asp:Button id="id" text="label" OnClick="sub" runat="server"
/> |
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.
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: