All server controls always appear within a <form>
and tag the <form> tag must contain the runat="server"
attribute.
A D V E R T I S E M E N T
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 and 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 and 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,they are automatically assigned by ASP.NET,if you do not specify the name and id attributes.
Note: An .aspx page can only contain ONE <form runat="server">control!
You will see that ASP.NET has added these attributes to the form,if you select view source in an .aspx page containing a form with no name, method, action, or id attribute specified. It looks something like this:
The id attribute defines a unique name for the button and the text attribute assigns a label to the button and the onClick event handler specifies a named subroutine to execute.
In an .aspx file,in the following example we declare a Button control. A button click runs a subroutine which can change the text on the button:
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