C#-使用ListBox组件中的displaymember设置两个属性

我尝试在列表框组件中的同一行显示“FirstName”和“LastName”属性,如“SMITH Robert”,但启动程序时,我有Id属性。问题可能是程序找不到属性“LastName”和“FirstName”。。。

我的客户类别:

public class Customer
{
    private int id;
    private string lastName;
    private string firstName;

    public Customer(int id, string lastName, string firstName)
    {
        this.id = id;
        this.lastName = lastName.ToUpper();
        this.firstName = firstName;
    }

    #region Accessors

    public int GetId() { return id; }
    public string GetLastName() { return lastName; }
    public string GetFirstName() { return firstName; }

    public void SetId(int id) { this.id = id; }
    public void SetLastName(string lastName) { this.lastName = lastName; }
    public void SetFirstName(string firstName) { this.firstName = firstName; }

    #endregion

    #region Properties

    public int Id { get { return id; } set { id = value; } }
    public string LastName { get { return lastName; } set { lastName = value; } }
    public string FirstName { get { return firstName; } set { firstName = value; } }

    #endregion
}

我将用于此操作的函数(customers是从 通道 数据库(此部分工作)):

// Define where is from data.
lbxCustomers.DataSource = customers;
// Value show in listbox.
lbxCustomers.DisplayMember = "LastNameFirstName";
// Value when row is selected in listbox.
lbxCustomers.ValueMember = "Id";