System.StringHelper.IsNullOrWhiteSpace C# (CSharp) Method

        public static Boolean IsNullOrWhiteSpace(this String value)
        {
            if (value != null)
            {
                for (var i = 0; i < value.Length; i++)
                {
                    if (!Char.IsWhiteSpace(value[i])) return false;
                }
            }
            return true;
        }