Use reflection to modify private members outside the class

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Reflection;using System.ComponentModel;namespace AttributeTest{    public class Program    {             static void Main(string[] args)        {          AttributeTest aT=new AttributeTest();          aT.FunAttributeTest();          FunAttributeTest(aT);          Console.ReadLine();        }        public static void FunAttributeTest(AttributeTest aT)        {            FieldInfo[] objFields = aT.GetType().GetFields(AttributeTest.bindingFlags);            foreach (FieldInfo fi in objFields)            {                // Get the custom attributes                if (fi.FieldType == typeof(string))                {                    fi.SetValue(aT, fi.GetValue(aT)+" and I'm modified out of my class.");                    Console.WriteLine("" + fi.GetValue(aT));                }                Attribute[] attributes = System.Attribute.GetCustomAttributes(fi);                foreach (Attribute attribute in attributes)                {                    if (attribute is DescriptionAttribute)                    {                        DescriptionAttribute attributeT = attribute as DescriptionAttribute;                        Console.WriteLine("" + attributeT.Description);                    }                }            }        }    }

public  class AttributeTest    {        public static BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;        private string mPrivate = "I'm a private member.";        public string mPublic = "I'm a private member.";        [Description("Publisher of a given software inventory record")]        private string publisher = "publisher";        [Description("Title of a given software inventory record")]        private string title = "title";        [System.Xml.Serialization.XmlAttributeAttribute()]        public string Publisher        {           get            {                return this.publisher;            }            set            {                this.publisher = value;            }        }        public string Title        {            get            {                return this.title;            }            set            {                this.title = value;            }        }                public void FunAttributeTest()        {            FieldInfo[] objFields = this.GetType().GetFields(bindingFlags);            foreach (FieldInfo fi in objFields)            {                // Get the custom attributes                if (fi.FieldType==typeof(string))                {                    Console.WriteLine(""+fi.GetValue(this));                }                Attribute[] attributes = System.Attribute.GetCustomAttributes(fi);                foreach (Attribute attribute in attributes)                {                    if (attribute is DescriptionAttribute)                    {                        DescriptionAttribute attributeT = attribute as DescriptionAttribute;                        Console.WriteLine(""+attributeT.Description);                    }                }            }        }    }}