What is state management? Explain Application state and Viewstate with suitable example.
Application State Example <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btn_Click(object sender, System.EventArgs e)
{
int counter = 0;
if(Application["counter"] !=null)
{
counter = (int)Application["counter"];
}
counter++;
Application["counter"] = counter;
label.Text = "Counter : " + counter.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Application state example in ASP.NET</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="label" runat="server" Font-Size="Large" ForeColor="#000000"
Text="Counter : 0"> </asp:Label>
<br />
<asp:Button ID="btn" runat="server" Text="Increment Counter"
OnClick="btn_Click" /> </div> </form> </body> </html>
View State Example <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
if(ViewState["counter"] !=null)
{
counter = (int)ViewState["counter"];
label.Text = "Counter : " + counter.ToString();
}
protected void btn_Click(object sender, System.EventArgs e)
{
if(ViewState["counter"] !=null)
{
counter = (int)ViewState["counter"];
}
else
{
int counter = 0;
}
counter++;
ViewState["counter"] = counter;
label.Text = "Counter : " + counter.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>View state example in ASP.NET</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="label" runat="server" Font-Size="Large" ForeColor="#000000">
</asp:Label>
<br />
<asp:Button ID="btn" runat="server" Text="Increment Counter"
OnClick="btn_Click" /> </div> </form> </body> </html>
