c#实体类实例 为什么是引用关系啊？
namespace BureauNews.Entity {
  public class Ips {
  private int id;
  private string ip = String.Empty;
  private string depict = String.Empty;
  private int is_audit = 0;

  public Ips() { }
  public int Id {
  get { return this.id; }
  set { this.id = value; }
  }
  public string IP {
  get { return this.ip; }
  set { this.ip = value; }
  }
  public string Depict {
  get { return this.depict; }
  set { this.depict = value; }
  }
  public int IsAudit {
  get { return this.is_audit; }
  set { this.is_audit = value; }
  }
  }
}
Ips i = new Ips();
i.id=5;
Ips i2 = i;
i2.id=6;
这时i.id=6 
为什么i2是引用i的关系，我是实例啊。

------解决方案--------------------
类是引用类型，不是值类型