Set Values for Nested Class

I have two classes:

    public class Task {
       public int TaskId {get;set;}
       public string Desc {get;set;}
       public Client taskClient {get;set;}
   }

   public class Client {
      public string Firstname {get;set;}
      public string Lastname {get;set;}
  }

I have lists of values (about 100) with the following structure: TaskId = 1, Desc = "Task 1", Firstname = "Mark", Lastname ="Smith".

How can I create new tasks using reflection in this case?