How to use Session.Abandon() method in asp.net

Session Abandon() method to cancel current session
HttpSessionState.Abandon() method allow us to cancel the current session. we can call this method in asp.net application as Session.Abandon() method. this method has no parameter and it has no return value. Abandon() method is exists under System.Web.SessionState namespace.

this Session.Abandon() method destroy all the objects stored in a session object and release their resources. when a session time out, the server also destroy 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if we call the Session.Abandon() method, the current session is no longer valid.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 next http request. Start event occurs when a session is created. SessionStateModule.End event is supported only when session state mode is InProc.

by default, session identifiers for abandoned or expired sessions are recycled. we can disable this by setting regenerateExpiredSessionId attribute of the sessionState configuration element to true.

the following asp.net c# example code demonstrate 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>



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