Pass the values to Itemchoicetype[]

How can i pass the value to the below ItemsChoiceType[]

public partial class PersonalDetailsType : object, System.ComponentModel.INotifyPropertyChanged
{

private ItemsChoiceType[] itemsElementNameField;

[System.Xml.Serialization.XmlElementAttribute("FamilyName", typeof(string), Order=1)]
[System.Xml.Serialization.XmlElementAttribute("FirstName", typeof(string), Order=1)]
[System.Xml.Serialization.XmlElementAttribute("MiddleName", typeof(string), Order=1)]
[System.Xml.Serialization.XmlElementAttribute("SingleName", typeof(string), Order=1)]
[System.Xml.Serialization.XmlChoiceIdentifierAttribute("ItemsElementName")]

}