Session Abandon() method to cancel current session
HttpSessionState class’s Abandon() method allows us to cancel the current session. We can call this method in an ASP.NET application like Session.Abandon() method. This method has no parameter and it has no return value. Abandon() method exists under System.Web.SessionState namespace.
This Session Abandon() method destroys all the objects stored in a session object and releases their resources. When a session time out, the server also destroys all objects from this session. In this case, we do not need to call the Session Abandon() method.
If we call the Session Abandon() method, the current session is no longer valid. But a new session can be started. Session Abandon() method causes the SessionStateModule End event to be raised which occurs when a session ends. A new SessionStateModule Start event will be raised in the next HTTP request. The Start event occurs when a session is created. SessionStateModule End event is supported only when the session state mode is InProc.
By default, session identifiers for abandoned or expired sessions are recycled. We can disable this by setting the regenerateExpiredSessionId attribute of the sessionState configuration element to true.
The following ASP.NET C# example code demonstrates to us how can we cancel the current session and release all from memory in an ASP.NET application.
SessionAbandon.aspx
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Page_Load(object sender, System.EventArgs e) {
Session["FavoriteFlower"] = "Rose";
Label1.Text = "Session read...<br />";
Label1.Text += "Favorite Flower:" + Session["FavoriteFlower"];
}
protected void Button1_Click(object sender, System.EventArgs e) {
Session.Abandon();
Label1.Text = "Current session cancel successful!";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>asp.net session Abandon example: how to cancel the current session and release all from memory</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:Navy">asp.net session example: Abandon</h2>
<asp:Label
ID="Label1"
runat="server"
Font-Size="Large"
ForeColor="DeepPink"
>
</asp:Label>
<br />
<asp:Button
ID="Button1"
runat="server"
Text="Cancel the session"
OnClick="Button1_Click"
Font-Bold="true"
ForeColor="DarkGreen"
/>
<br /><br />
<asp:HyperLink
ID="Hyperlink1"
runat="server"
NavigateUrl="~/AbandonTest.aspx"
Text="Go to Abadon test page"
>
</asp:HyperLink>
</div>
</form>
</body>
</html>
AbandonTest.aspx
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Page_Load(object sender, System.EventArgs e) {
Label1.Text = "Session read...<br />";
Label1.Text += "Favorite Flower:" + Session["FavoriteFlower"];
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:Red">asp.net session example: Abandon Test</h2>
<asp:Label
ID="Label1"
runat="server"
Font-Size="Large"
ForeColor="DodgerBlue"
>
</asp:Label>
<br /><br />
<asp:HyperLink
ID="Hyperlink1"
runat="server"
NavigateUrl="~/SessionAbandon.aspx"
Text="Go to Abadon page"
>
</asp:HyperLink>
</div>
</form>
</body>
</html>
