ASP.NET Tutorial/ASP.Net Instroduction/Code behind

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code-behind model allows for code separation of the page"s business logic from its presentation logic

presentation logic for the page is stored in an .aspx page, whereas the logic piece is stored in a separate class file: .aspx.vb or .aspx.cs.
File Options Using Code-Behind                File Created
Web Form                                      .aspx file
                                              .aspx.vb or .aspx.cs file 
Master Page                                    .master file
                                              .master.vb or .master.cs file 
Web User Control                            .ascx file
                                              .ascx.vb or .ascx.cs file 
Web Service                                    .asmx file
                                              .asmx.vb or .asmx.cs file 
An .aspx page that uses the ASP.NET 2.0 code-behind model (VB version)
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb"
   Inherits="_Default" %>
    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
   <title>Simple Page</title>
</head>
<body>
   <form runat="server">
      What is your name?<br />
      <asp:Textbox ID="Textbox1" Runat="server"></asp:Textbox><br />
      <asp:Button ID="Button1" Runat="server" Text="Submit"
       OnClick="Button1_Click" />
      <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>
</body>
</html>
A code-behind page  (VB version)
Partial Class _Default
   Inherits System.Web.UI.Page
    
   Protected Sub Button1_Click(ByVal sender As Object, _
      ByVal e As System.EventArgs) Handles Button1.Click
    
       Label1.Text = "Hello " & TextBox1.Text
   End Sub
End Class

An .aspx page that uses the ASP.NET 2.0 code-behind model (C# version)
 
<%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_aspx" %>
 
    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
   <title>Simple Page</title>
</head>
<body>
   <form runat="server">
      What is your name?<br />
      <asp:Textbox ID="Textbox1" Runat="server"></asp:Textbox><br />
      <asp:Button ID="Button1" Runat="server" Text="Submit"
       OnClick="Button1_Click" />
      <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>
</body>
</html>

A code-behind page (C# version)
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
    
public partial class _Default : System.Web.UI.Page
{
   protected void Button1_Click(object sender, EventArgs e)
   {
      Label1.Text = "Hello " + Textbox1.Text;
   }
}


Code behind (VB.net)

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="FirstPageCodeBehind" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>First Page Code-Behind</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Button
        id="Button1"
        Text="Click Here"
        Runat="server" />
    
    <br /><br />
        
    <asp:Label
        id="Label1"
        Runat="server" />    
    
    </div>
    </form>
</body>
</html>

File: Default.aspx.vb

Partial Class FirstPageCodeBehind
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Label1.Text = "Click the Button"
    End Sub

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Label1.Text = "Thanks!"
    End Sub
End Class


code-inline model: all the code is contained within a single .aspx page

File Options Using Inline Coding          File Created
Web Form                                  .aspx file 
Master Page                               .master file 
Web User Control                          .ascx file 
Web Service                               .asmx file 

 
File: Default.aspx (VB)
<%@ Page Language="VB" %>
    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    
<script runat="server">
   Protected Sub Button1_Click(ByVal sender As Object, _
      ByVal e As System.EventArgs)
    
      Label1.Text = "Hello " & Textbox1.Text
   End Sub
</script>
    
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
   <title>Simple Page</title>
</head>
<body>
   <form runat="server">
      What is your name?<br />
      <asp:Textbox ID="Textbox1" Runat="server"></asp:Textbox><br />
      <asp:Button ID="Button1" Runat="server" Text="Submit"
       OnClick="Button1_Click" />
      <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>
</body>
</html>

File: Default.aspx (C#)
<%@ Page Language="C#" %>
    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    
<script runat="server">
   protected void Button1_Click(object sender, System.EventArgs e)
   {
      Label1.Text = "Hello " + Textbox1.Text;
   }
</script>
    
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
   <title>Simple Page</title>
</head>
<body>
   <form runat="server">
      What is your name?<br />
      <asp:Textbox ID="Textbox1" Runat="server"></asp:Textbox><br />
      <asp:Button ID="Button1" Runat="server" Text="Submit"
       OnClick="Button1_Click" />
      <asp:Label ID="Label1" Runat="server"></asp:Label>
   </form>
</body>
</html>


Use Code behind

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="FirstPageCodeBehind" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>First Page Code-Behind</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button
        id="Button1"
        Text="Click Here"
        OnClick="Button1_Click"
        Runat="server" />
    <br /><br />
    <asp:Label
        id="Label1"
        Runat="server" />
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class FirstPageCodeBehind : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Click the Button";
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = "Thanks!";
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ASP.Net_Instroduction/Code_behind&oldid=3082»