Check if page in episerver is opened in editmode/adminmode

gistfile1.cs

private bool IsOpenedInEditMode()
{
    bool isInEditMode = false;
    If(HttpContext.Current.Request.UrlReferrer != null)
    {
        isInEditMode = Regex.IsMatch(HttpContext.Current.Request.UrlReferrer.LocalPath, "/admin/|/edit/", RegexOptions.IgnoreCase);
    }
    return isInEditMode;
}