c# - Use factory pattern when using different properties based on a property value -

in web api 2 project have model orderline (nested object of order model). client can post data , via ivalidatableobject validate model. simplyfied, models looks this:

public class order {     public int id { get; set; }     public string description { get; set; }     public icollection<orderline> orderlines { get; set; } }  public class orderline : ivalidatableobject {     public int id { get; set; }      public string type { get; set; }      [required]     public string itemcode { get; set; }      [required]     public string description { get; set; }      [requiredif("type == 'a'")]     public string deliverytype { get; set; }      public ienumerable<validationresult> validate(validationcontext      validationcontext)     {         if(type.toupper() == "a")         {             var item = itemcode + deliverytype;              using(mydbcontext db = new mydbcontext))             {                 var items = db.items.where(q => q.itemcode == item.tostring()).singleordefault();                 if(items == null)                 {                     yield return new validationresult("the conbination of itemcode , confactiontype not allowed");                 }             }         }          if(type.toupper() == "b")         {             using(mydbcontext db = new mydbcontext))             {                 var items = db.items.where(q => q.itemcode == item.tostring()).singleordefault();                 if(items == null)                 {                     yield return new validationresult("the field itemcode not contain valid code");                 }             }         }     } } 

based on value of orderline.type property know kind of orderline type i'm going write database. in above class, have few properties, imagine that, depending on type, have multiple different properties , validation rules. based on this post wondering if should use factory this:

public class orderlinea : orderline {     // properties     // validation rules }  public class orderlineb : orderline {     // (other) properties     // (other) validation rules }