logout auto when client close the browser

Mohamed,

In order to ensure that the authentication cookie in your ASP.NET MVC application expires when the user closes their browser, you need to configure the cookie authentication to use a session-based cookie rather than a persistent cookie. A session cookie is deleted when the browser session ends (i.e., when the browser is closed).

Here’s how you can configure this in an ASP.NET MVC application using the .NET Framework.

In your Startup.Auth.cs file, which is typically found in the App_Start folder of your ASP.NET MVC project, you need to modify the settings in the CookieAuthenticationOptions when configuring the UseCookieAuthentication middleware.

Here's an example of how you can configure it

public void ConfigureAuth(IAppBuilder app)
{
    app.UseCookieAuthentication(new CookieAuthenticationOptions
    {
        AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
        LoginPath = new PathString("/Account/Login"),
        Provider = new CookieAuthenticationProvider
        {
            // Enables the application to validate the security stamp when the user logs in.
            // This is a security feature which is used when you change a password or add an external login to your account.  
            OnValidateIdentity = SecurityStampValidator.OnValidateIdentity(
                validateInterval: TimeSpan.FromMinutes(30),
                regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
        },
        SlidingExpiration = true,
        ExpireTimeSpan = TimeSpan.FromMinutes(30),
        CookieHttpOnly = true,

        // Setting the CookieExpiration to null makes it a session cookie
        CookieExpiration = null
    });            
}

Important points:

• CookieExpiration: Set this to null to make the cookie a session cookie, which means it will expire automatically when the browser is closed.
• ExpireTimeSpan: Controls the life span of the cookie when the browser remains open. Adjust it according to your security requirements.