Built-in helper to parse User.Identity.Name into Domain\Username

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This is better (easier to use, no opportunity of NullReferenceExcpetion and conforms MS coding guidelines about treating empty and null string equally):

public static class Extensions
{
    public static string GetDomain(this IIdentity identity)
    {
        string s = identity.Name;
        int stop = s.IndexOf("\\");
        return (stop > -1) ?  s.Substring(0, stop) : string.Empty;
    }

    public static string GetLogin(this IIdentity identity)
    {
        string s = identity.Name;
        int stop = s.IndexOf("\\");
        return (stop > -1) ? s.Substring(stop + 1, s.Length - stop - 1) : string.Empty;
    }
}

Usage:

IIdentity id = HttpContext.Current.User.Identity;
id.GetLogin();
id.GetDomain();

This requires C# 3.0 compiler (or newer) and doesn’t require 3.0 .Net for working after compilation.

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