In this article I will explain what application object is and I will explain how we will use application objects in asp.net.
Description:
Today I am writing this post to explain about application object in asp.net. In one of the interview I got question like what application object is and where we will use application object in asp.net.
Today I am writing this post to explain about application object in asp.net. In one of the interview I got question like what application object is and where we will use application object in asp.net.
What is an application object?
Application
object is used to store the information and access variables from any
page in application. Application object is same as session object only
the difference is session object is
used to maintain the session for particular user. If one user enters in
to the application then session id will create for that particular user
if he leaves from the application then the session id will deleted. If
they again enter in to the application they will get different session
id but application object is same for all users once application object
is created that application object is used throughout the application
regardless of user. The information stored in application object
accessed throughout all the pages in application (like database
connection information) and we can change the application object in one
place those changes automatically reflected in all the pages.
You can create application objects in Global.asax file and access those variables throughout the application. To know about how to add Global.asax file check the post here
<%@ Application Language="C#" %>
<script runat="server">
void Application_Start(object sender, EventArgs e)
{
// Code that runs on application startup
Application["UserID"] = "SureshDasari";
}
</script>
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After completion of writing code global.asax file write the following code in aspx page
<html>
<head>
<title>Application Object Sample</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Label id="lblText" runat="server"></asp:Label>
</form>
</body>
</html>
|
After that write the following code in code behind like this
public void Page_Load(object sender, EventArgs e)
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{
this.lblText.Text = "UserName: " + Application["UserID"] + "<br>";
}
| |
Now run your application you will see the application object value in your page. I hope it helps you.
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