New Code-Behind Model in ASP.NET 2.0
ASP.NET 1.x supports two coding models: the inline model, in which markup and
code coexist in the same ASPX file, and the code-behind model, which places
markup in ASPX files and code in source code files. ASP.NET 2.0 introduces a
third model: a new form of code-behind that relies on the new partial classes
support in the Visual C# and Visual Basic compilers. Code-behind in ASP.NET 2.0
fixes a nagging problem with version 1.x: the requirement that code-behind
classes contain protected fields whose types and names map to controls declared
in the ASPX file.
The following code listing shows the .aspx file named HelloWorld.aspx:
<%@ Page Language=”C#” CodeFile=”HelloWorld.aspx.cs” Inherits=”HelloWorld”
%>
<html>
<body>
<form id=”form1” runat=”server”>
<asp:TextBox ID=”TextBox1” runat=”server”></asp:TextBox>
<asp:Button ID=”Button1” runat=”server” OnClick=”Button1_Click”
Text=”Button”/>
<asp:Label ID=”Label1” runat=”server”>
</form>
</body>
</html>
The code-behind file referenced by HelloWorld.aspx file is HelloWorld.aspx.cs,
which is defined as follows:
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class HelloWorld : System.Web.UI.Page
{
protected void
Button1_Click(object sender, EventArgs e)
{
Label1.Text = TextBox1.Text;
}
}
As you can see, HelloWorld.aspx contains the markup and HelloWorld.aspx.cs
contains the code. The Inherits attribute in the @Page directive identifies the
code-behind class, while the CodeFile attribute identifies the file containing
the class. Note the absence of any fields in the HelloWorld class providing
mappings to controls in the ASPX file. Old-style code-behind is still
supported, but this new model is now the preferred one. Not surprisingly,
Visual Studio 2005 supports the new model natively.
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