Some thoughts around server side browser detection

BrowserInfo.cs

public class BrowserInfo
{
    private readonly HttpContextBase _context;

    public BrowserInfo(HttpContextBase context)
    {
        _context = context;
    }

    public HttpBrowserCapabilitiesBase HttpBrowserCapabilities
    {
        get { return _context.Request.Browser; }
    }
    public string UserAgent { get { if (_context.Request == null) return ""; return _context.Request.UserAgent ?? ""; } }
    public bool IsUnknown { get { return !IsFirefox && !IsGoogleChrome && !IsOpera && !IsInternetExplorer; } }
    public bool IsInternetExplorer { get { return UserAgent.Contains("MSIE"); } }
    public bool IsGoogleChrome { get { return UserAgent.Contains("Chrome"); } }
    public bool IsFirefox { get { return UserAgent.Contains("Firefox"); } }
    public bool IsOpera { get { return UserAgent.Contains("Opera"); } }
    public bool IsSafari { get { return UserAgent.Contains("Opera"); } }
    public bool IsMobile { get { return UserAgent.Contains("Mobile") || UserAgent.Contains("Android"); } }
    public int MajorVersion { get { return HttpBrowserCapabilities.MajorVersion; } }
    public string Version { get { return HttpBrowserCapabilities.Version; } }
}