How to Pass Array Model as a value?

This is my model:

public class APIEntity

{

public List unitCodes { get; set; }

public DateTime start { get; set; }

public DateTime end { get; set; }

public DataObject[] fields { get; set; }

}

public class DataObject

{

public string unitCode { get; set; }

public string timedate { get; set; }

public string latitude { get; set; }

public string longitude { get; set; }

public string ignition { get; set; }

public string velocity { get; set; }

public string positionerror { get; set; }

public string digitherm5 { get; set; }

public string direction { get; set; }

public string distance { get; set; }

}

I am just trying to pass the values:

var dat = new APIEntity()

{

unitCodes = new List() { 19215 },

start = DateTime.ParseExact("2018-03-12 10:00:00", "yyyy-MM-dd HH:mm:ss", null),

end = DateTime.ParseExact("2018-03-12 11:00:00", "yyyy-MM-dd HH:mm:ss", null),

fields = ?????? // I want to pass the members here...unitcode,timedate,bla bla....

};