如何最好地检测ASP.NET过期的会话？

protected void Session_End(object sender, EventArgs e)
{
    // 处理会话过期的情况
}

public class CustomSessionStateStore : SessionStateStoreProviderBase
{
    public override void InitializeRequest(HttpContext context)
    {
        // 初始化请求
    }

    public override void EndRequest(HttpContext context)
    {
        // 处理会话过期的情况
    }

    // 其他方法的实现
}

protected void Application_Error(object sender, EventArgs e)
{
    var exception = Server.GetLastError();
    if (exception is HttpException httpException && httpException.GetHttpCode() == 500)
    {
        // 处理会话过期的情况
    }
}