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    <p>Static is equivalent to singleton – common for the entire application thus all users. You need session-based approach to achieve this. However, if you don't have access to session (such as in business libraries), you can use singleton approach (code example to follow.)</p> <p>Edit: code example to achieve this with singleton approach (similar to static but more maintainable). It uses EF code first approach so you should adapt it if you don't use EF:</p> <p>Edit 2: This is how you should use it:</p> <p>To get time in user timezone:</p> <pre><code>var userId = 5; // assuming 5 a valid user. If not found, current local timezone will be used (`DateTime.Now`) var localTime = UserDateTime.Instance.GetTime(userId);` </code></pre> <p>If a new user is added or existing is modified, you can re-load timezones: (you can optimize it further as per your needs.)</p> <pre><code>UserDateTime.Instance.LoadTimezones(); </code></pre> <p>Implementation:</p> <pre><code>namespace YourApp { using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Data.Entity; class UserDateTime { public static readonly UserDateTime Instance = new UserDateTime(); private UserDateTime() // singleton { LoadTimezones(); } private Dictionary&lt;int, string&gt; _userTimezones = new Dictionary&lt;int, string&gt;(); public DateTime GetTime(int userId) { if (_userTimezones.ContainsKey(userId)) return TimeZoneInfo.ConvertTime(DateTime.UtcNow, TimeZoneInfo.FindSystemTimeZoneById(_userTimezones[userId])); else return DateTime.Now; // You could throw an error. } public void LoadTimezones() { using (var db = new YourDbContext()) { _userTimezones = db.UserTimezones.ToDictionary(t =&gt; t.UserId, t =&gt; t.TimezoneId); } } } class UserTimezone { public int UserId { get; set; } public string TimezoneId { get; set; } } class YourDbContext : DbContext { public DbSet&lt;UserTimezone&gt; UserTimezones { get; set; } } } </code></pre> <p>Edit: Derived from <a href="http://ASPSecurityKit.net/features#fLocalization" rel="nofollow">ASP Security Kit</a>. </p>
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    1. POLife of a Static class in ASP.Net
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    1. USVarun K
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    1. COI doubt your comment that Singleton are similar to static classes. Singleton class would have single instance which would prevail for whole App Domain and which would be created on demand but in case of static classes there would not be any instance of the class and static class comes up as soon as application is started. Please correct me if I am wrong
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