Add Object[] in Datamember of Datacontract

public class ArrTestObj
{
   private string _str1 = "0";
   private Object[] ArListResponse;
   public string str1{ get { return _str1; } set { _str1 = value; } }
   public Object[] ArrUpdates { get { return ArListResponse; } set { Object[] val = value; ArListResponse = val; } 
}

[DataContract]
public class ArrTestObj
{
 
    [DataMember]
    public string str1{ get; set; }

    [DataMember]
    public Object[] ArrUpdates { get; set; }
    
}