C# Class issue

Hi I'm getting Error Message
System.NullReferenceException: Object reference not set to an instance of an object.
See my code

  public partial class Order  {
public OrderShipTo[] ShipTo {
            get {
                return this.shipToField;
            }
            set {
                this.shipToField = value;
                this.RaisePropertyChanged("ShipTo");
            }
        }

}

public partial class OrderShipTo : OrderMailer 
{





}

public partial class OrderMailer 
{

 [System.Xml.Serialization.XmlElementAttribute(Order=5)]
        public string CompanyName {
            get {
                return this.companyNameField;
            }
            set {
                this.companyNameField = value;
                this.RaisePropertyChanged("CompanyName");
            }
        }


}



Calling Class:
Order newOrders = new Order();
OrderShipTo oShipto = new OrderShipTo();
            OrderMailer m1 = new OrderMailer();
            newOrders.ShipTo[1] = oShipto;
            
            newOrders.ShipTo[1].CompanyName = "Testing1";

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Error Message
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 94:             OMS.OrderShipTo oShipto = new OMS.OrderShipTo();
Line 95:             OMS.OrderMailer m1 = new OMS.OrderMailer();
Line 96:             newOrders.ShipTo[1] = oShipto;  <------------------------------------Error (NullReferenceException: Object reference not set to an instance of an object.)