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Serialize object without null field/member to xml/json
class Program
{
    static void Main(string[] args)
    {
        var m = new Member()
        {
            ID = 3,
            FirstName = "Bruce"
        };
        var dto = new MemberDTO()
        {
            ID = 3,
            FirstName = "Bruce"
        };

        // Serialize to xml format
        var xs = new System.Xml.Serialization.XmlSerializer(typeof(Member));
        var sw = new System.IO.StringWriter();
        xs.Serialize(sw, m);
        Console.WriteLine("Serialize object to xml");
        Console.WriteLine(sw);

        // Serialize to xml format without null value
        xs = new System.Xml.Serialization.XmlSerializer(typeof(MemberDTO));
        sw = new System.IO.StringWriter();
        xs.Serialize(sw, dto);
        Console.WriteLine("Serialize dto-object to xml");
        Console.WriteLine(sw);

        Console.WriteLine("Serialize object to json");
        Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(m));
        Console.WriteLine("Serialize dto-object to json");
        Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(dto));

        Console.Read();
    }
}

public class Member
{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime? Birthday { get; set; }
}

public class MemberDTO
{
    public int ID { get; set; }
    [Newtonsoft.Json.JsonProperty(NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
    public string FirstName { get; set; }
    [Newtonsoft.Json.JsonProperty(NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
    public string LastName { get; set; }
    [Newtonsoft.Json.JsonProperty(NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
    public DateTime? Birthday { get; set; }

    #region
    public bool ShouldSerializeFirstName()
    {
        return !string.IsNullOrWhiteSpace(FirstName);
    }
    public bool ShouldSerializeLastName()
    {
        return !string.IsNullOrWhiteSpace(LastName);
    }
    public bool ShouldSerializeBirthday()
    {
        return Birthday.HasValue;
    }
    #endregion
}
Result:
Serialize object to xml
<?xml version="1.0" encoding="utf-16"?>
<Member xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ID>3</ID>
  <FirstName>Bruce</FirstName>
  <Birthday xsi:nil="true" />
</Member>
Serialize dto-object to xml
<?xml version="1.0" encoding="utf-16"?>
<MemberDTO xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ID>3</ID>
  <FirstName>Bruce</FirstName>
</MemberDTO>
Serialize object to json
{"ID":3,"FirstName":"Bruce","LastName":null,"Birthday":null}
Serialize dto-object to json
{"ID":3,"FirstName":"Bruce"}