This control can hold any control generated at run time. Example:

<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=“PlaceHolder.aspx.cs” Inherits=”PlaceHolder” %>

<script runat=”server”>

runat=”server”

The form tag includes a name and the code runat=”server” This little code line means that everything will be taken care of by the server.

@ Page Language=”C#”

This first segment lets the page know that the language in use is C# and not VB or some other language. It’s pretty self-explanatory.

AutoEventWireup=”true”

The AutoEventWireup Boolean indicates whether the ASP.NET pages are automatically connected to event-handling functions. With C#, the default is set to true, so the pages are connected to event-handling functions.

CodeFile=”Default.aspx.cs”

The final section indicates the name of the C# file and what it inherits.  Since the name of the ASP.NET design file is Default.aspx the CodeFile is Default.aspx.cs.

Inherits=”_Default” 

The Inherits attribute refers to the name of the class that the code inherits.