XML Serialization

cant find a solution for:

Have some xml

  <address>ADDRESS</address> 
  <cc_cvc /> 
  <cc_expiration_date>01/2022</cc_expiration_date>

And try to deserialize some of this

public int creditCardCVC;

[XmlElement("cc_cvc")]
public int CreditCardCVC { get { return creditCardCVC; } set { creditCardCVC = (int)value; } }

or some of this

    [XmlElement("cc_cvc", IsNullable=true)]
    public int CreditCardCVC { get; set; }

And take some error in deserialize method "There is an error in XML document (8, 2)"

if this property declare like a string all is working, but int create error. Please tell me how to save Int but may be set not required this field or some thing else

Thank you