Sunday, 25 August 2013

Fragment Caching in ASP.NET or How To Perform Fragment Caching in ASP.NET by Using VB.NET/C# or Fragment Caching Example, Page Fragment Caching in ASP.NET

                               Hi friends, in this article I will explain about Fragment Caching in ASP.NET or How To Perform Fragment Caching in ASP.NET by Using VB.NET/C# or Fragment Caching Example, Page Fragment Caching in ASP.NET.
What is Fragment Caching in ASP.NET?
  • Fragment Caching is used to the caching of individual user controls within a Web Form.
  • Each user control can have independent cache durations and implementations of how the caching behavior is to be applied.
  • Fragment caching is useful when you need to cache the some part of a page like user control.
  • Navigation bars, header, and footers are good examples for fragment caching.
  • Fragment caching allows to cache specific portions of the page rather than the whole page. It is done by implementing the page in different parts by creating everything in form of user controls and caching each user control individually.
I will explain the Fragment Caching by simple example.
Create website (File ---- New website ----give name to website).
Take one Web User Control (how to create webuser control) and name it as fragment.aspx.
And right the following code in source.
<%@ Control Language="VB" AutoEventWireup="false" CodeFile="fragment.ascx.vb" Inherits="fragment" %>
<%@ OutputCache Duration="5" VaryByParam="None" %>
<p><asp:Label ID="lblTime" runat="server" EnableViewState="false" ForeColor="green" /></p>
In Code behind write following code.
In VB.NET code
Partial Class fragment
    Inherits System.Web.UI.UserControl
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        lblTime.Text = DateTime.Now.ToString()
    End Sub
End Class

In C#:
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
partial class fragment : System.Web.UI.UserControl
{
                protected void Page_Load(object sender, System.EventArgs e)
                {
                                lblTime.Text = DateTime.Now.ToString();
                }
    Public fragment()
                {
                                Load += Page_Load;
                }
}
Take one web form and name it as FragmentCaching.aspx
In Source code write the following code.
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="FragmentCaching.aspx.vb" Inherits="FragmentCaching" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Src="~/fragment.ascx" TagPrefix="usrcntl" TagName="changetime" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
     <title>Aspdotnet-Roja:Fragment caching Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h1 style="color:Red">Fragment caching Example</h1>
    <h5> Refresh the Page,the time doesn't change. Keep refreshing and after 5 seconds you should see the change in time.</h5>  
        <usrcntl:changetime runat="server" ID="uc11" />
    </div>
    </form>
</body>
</html>

The output of the page is as follows.

In this way, we are just caching the fragment of the page. The whole page executes on the server but the user control data comes from the cache as due to OutputCache directive it doesn't executes every time.
Hope this article would be of use in understanding the partial/fragment caching in ASP.NET.
Thanks for reading my Aspdotnet-Roja blog, please give me your comment or feedback. Keep reading and sharing your knowledge!

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