PhoneNumbers.NumberFormat.Builder.AddLeadingDigitsPattern C# (CSharp) Method

            public Builder AddLeadingDigitsPattern(string value)
            {
                if(value == null) throw new global::System.ArgumentNullException("value");
                result.leadingDigitsPattern_.Add(value);
                return this;
            }

 public static void SetLeadingDigitsPatterns(XElement numberFormatElement, NumberFormat.Builder format)
 {
     foreach (XElement e in numberFormatElement.GetElementsByTagName(LEADING_DIGITS))
     {
         format.AddLeadingDigitsPattern(ValidateRE(e.Value, true));
     }
 }