System.Xml.Serialization.CodeIdentifier.MakeValid C# (CSharp) Method

        public static string MakeValid(string identifier)
        {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < identifier.Length && builder.Length < MaxIdentifierLength; i++)
            {
                char c = identifier[i];
                if (IsValid(c))
                {
                    if (builder.Length == 0 && !IsValidStart(c))
                    {
                        builder.Append("Item");
                    }
                    builder.Append(c);
                }
            }
            if (builder.Length == 0) return "Item";
            return builder.ToString();
        }

        private void ImportElementMember(XmlSchemaElement element, CodeIdentifiers members, string ns)
        {
            ElementAccessor accessor;

            if ((accessor = ImportArray(element, ns)) == null)
            {
                accessor = ImportElement(element, ns);
            }

            MemberMapping member = new MemberMapping();

            member.Name = CodeIdentifier.MakeValid(Accessor.UnescapeName(accessor.Name));
            member.Name = members.AddUnique(member.Name, member);
            if (member.Name.EndsWith("Specified", StringComparison.Ordinal))
            {
                string name = member.Name;
                member.Name = members.AddUnique(member.Name, member);
                members.Remove(name);
            }
            member.TypeDesc = ((TypeMapping)accessor.Mapping).TypeDesc;
            member.Elements = new ElementAccessor[] { accessor };
            if (element.IsMultipleOccurrence)
            {
                member.TypeDesc = member.TypeDesc.CreateArrayTypeDesc();
            }

            if (element.MinOccurs == 0 && member.TypeDesc.IsValueType && !member.TypeDesc.HasIsEmpty)
            {
                member.CheckSpecified = SpecifiedAccessor.ReadWrite;
            }
        }