C#的类，构造函数以及Array阵列的数据填充与绑定

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Insus.NET.Models
{
  public  class Customer
    {
        public int CustomerID { get; set; }

        public string CustomerName { get; set; }

        public string PID { get; set; }

        public Customer()
        {

        }

        public Customer(int customerId, string customerName, string pID)
        {
            CustomerID = customerId;
            CustomerName = customerName;
            PID = pID;
        }  
    }
}

public Customer[] ArrayCustoners()
        {
            Customer c1 = new Customer();
            c1.CustomerID = 9;
            c1.CustomerName = "张三";
            c1.PID = "123456789012";

            Customer c2 = new Customer(10, "李四", "321245677812");
            Customer c3 = new Customer() { CustomerID = 30, CustomerName = "吴广", PID = "213445678912" };

            return new Customer[]
            {
               c1,c2,c3
            };
        }

 public Customer[] ArrayCustoners1 = {
            new Customer(9,"张三", "123456789012"),
            new Customer(10,"李四","321245677812"),
            new Customer() { CustomerID = 30, CustomerName = "吴广", PID = "213445678912" }
        };

public Customer[] ArrayCustoners2()
        {
            Customer c1 = new Customer();
            c1.CustomerID = 9;
            c1.CustomerName = "张三";
            c1.PID = "123456789012";

            Customer[] array = new Customer[3];

            array[0] = c1;
            array[1] = new Customer(10, "李四", "321245677812");
            array[2] = new Customer() { CustomerID = 30, CustomerName = "吴广", PID = "213445678912" };
            return array;
        }

public Customer[] ArrayCustoners3()
        {
            Customer c1 = new Customer();
            c1.CustomerID = 9;
            c1.CustomerName = "张三";
            c1.PID = "123456789012";

            return new Customer[]
            {
                c1,
                new Customer(10, "李四", "321245677812"),
                new Customer() { CustomerID = 30, CustomerName = "吴广", PID = "213445678912" }
            };
        }