You can set the expiration time for ASP.NET Identity cookies by configuring the CookieAuthenticationOptions in your Startup class. Here's an example:
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using System;
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
// Add ASP.NET Identity services
services.AddIdentity<IdentityUser, IdentityRole>()
.AddDefaultTokenProviders();
// Configure cookie authentication options
services.Configure<CookieAuthenticationOptions>(options =>
{
options.ExpireTimeSpan = TimeSpan.FromMinutes(30); // set the expiration time to 30 minutes
});
}
public void Configure(IApplicationBuilder app)
{
// Use cookie authentication
app.UseAuthentication();
// Your middleware and routing configuration here
}
}
In this example, we're using the services.Configure method to configure the CookieAuthenticationOptions. We're setting the ExpireTimeSpan property to TimeSpan.FromMinutes(30) to set the expiration time for the cookie to 30 minutes. You can adjust the value of ExpireTimeSpan to any value that makes sense for your application.
Note that the ExpireTimeSpan property sets the maximum duration of the cookie. If the user's browser is closed or the user logs out before the expiration time, the cookie will be deleted. If you want to set an absolute expiration time for the cookie, you can use the ExpireTime property instead. For example, options.ExpiresTime = DateTimeOffset.UtcNow.AddMinutes(30) would set an absolute expiration time of 30 minutes from the current time.
You can destroy all sessions at once in ASP.NET by calling the Session.Abandon() method in your code. This method destroys the current session and releases its resources.
To destroy all sessions, you can loop through all active sessions in the SessionState object and call the Abandon() method on each session. Here's an example:
foreach (string key in Session.Keys)
{
Session[key] = null;
}
Session.Abandon();
In this example, the foreach loop iterates through all the keys in the Session object and sets their values to null to release any resources they may be holding. Finally, the Abandon() method is called to destroy the session.
Note that destroying all sessions may affect the behavior of your application, depending on how it is designed. It is usually better to destroy sessions on a per-user basis, as needed.
To set the href attribute of an asp:HyperLink control to "mailto:[email protected]" in .NET C#, you can use the NavigateUrl property of the HyperLink control. Here's how you can do it:
ASPX page:
<asp:HyperLink ID="emailLink" runat="server" Text="Send Email" />
Code-behind (C#):
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Set the href attribute to "mailto:[email protected]"
emailLink.NavigateUrl = "mailto:[email protected]";
}
}
In the code-behind, during the Page_Load event (or any other appropriate event), you can set the NavigateUrl property of the emailLink control to "mailto:[email protected]". This will make the hyperlink open the default email client with a new email addressed to "[email protected]" when clicked.
The mailto: URI scheme is used to create email links and is recognized by most web browsers and email clients. It allows users to click on the link and open their default email application with the specified email address pre-filled in the "To" field.
After setting the NavigateUrl, the rendered HTML for the hyperlink will look like this:
<a id="emailLink" href="mailto:[email protected]">Send Email</a>
When users click on the link, their default email client will open, ready to compose a new email to "[email protected]".