Code model

Writing Code
 Writing code in an ASP.NET Web form is done in three
ways:
 Mixed code method
 The code is in the same file as the web content, mixed with the
HTML code
 This method is not recommended as the source code is hard
to read and maintain
 Inline code method
 Code-behind method
2

Writing Code (2)
 Writing code in an ASP.NET web form is done in three
ways:
 The code is separated in a SCRIPT section in the same file
3

Writing Code (3)
 Writing code in an ASP.NET web form is done in three
ways:
 The code is in the code-behind page – a separate file from the
HTML content
 When using Visual Studio .NET this is the default method
4

Example: Inline Code Method
5
<html>
<asp:Button id="btn" runat="server"/>
...
</html>
<script Language="c#" runat="server">
private void btn_Click(object sender,
System.EventArgs e)
{
...
}
</script>

Code-behind Model
 A separate compiled file containing the program logic of
the page
 Each web page has its own code-behind page
 Has the same name as the web page to which it is attached
 The file extension is .aspx.cs
 The two files are built into one when the application is
started
7

How Does Code-behind Work?
 To associate an .aspx page to its code-behind class the
@Page directive is used
 VS.NET adds three attributes to the @Page directive:
 Inherits – allows the .aspx page to derive from the
code-behind class
 Codebehind – used internally by Visual Studio .NET to
associate the files
 Src – contains the name of the code-behind page
 Used if the application is not precompiled
8

JIT Compilation
 The Code-behind page can be either precompiled or just-
in-time (JIT) Compiled
 JIT compilation
 A compilation at first request
 Set by the Src attribute of the @Page directive
 VS.NET doesn’t add it by default
9

Precompilation
 Precompilation
 Avoids the delay at first request
 Simplifies the deployment of the web application
 The source code of the code-behind class is not
necessary
10

Code model

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