Hi Every body I have a problem and want help. I have created a phonebook application and it works fine after a awhile i liked to make an upgrade for my application and i started from scratch i didn't inherit it from my old class,and i successes too ,my request "I want to migrate my contacts from the old application to the new one" ,so i made an adapter class for this reason in my new application with the following code

using System;

using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Windows.Forms; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary;

namespace PhoneBook { class Adapter { PhoneRecord PhRecord; //the new application object CTeleRecord TelRecord; //the old application object string fileName;

    public Adapter(string filename)
    {
        fileName = filename;
    }

    public void convert()
    {

        PhRecord = new PhoneRecord(); 
        TelRecord = new CTeleRecord();

        FileStream OpFileSt = new FileStream(fileName, FileMode.Open,FileAccess.Read);


        BinaryFormatter readBin = new BinaryFormatter();



        for (; ; )
        {
            try
            {
                TelRecord.ResetTheObject();

                TelRecord = (CTeleRecord)readBin.Deserialize(OpFileSt);

                PhRecord.SetName = TelRecord.GetName;
                PhRecord.SetHomeNumber = TelRecord.GetHomeNumber;
                PhRecord.SetMobileNumber = TelRecord.GetMobileNumber;
                PhRecord.SetWorkNumber = TelRecord.GetWorkNumber;
                PhRecord.SetSpecialNumber = TelRecord.GetSpecialNumber;
                PhRecord.SetEmail = TelRecord.GetEmail;
                PhRecord.SetNotes = TelRecord.GetNotes;
                PhBookContainer.phBookItems.Add(PhRecord);


            }
            catch (IOException xxx)
            {
                MessageBox.Show(xxx.Message);


            }
            catch (ArgumentException tt)
            {
                MessageBox.Show(tt.Message);
            }
            //if end of file is reached
            catch (SerializationException x)
            {
                MessageBox.Show(x.Message + x.Source);
                break;
            }

        }
        OpFileSt.Close();

        PhBookContainer.Save(@"d:\MyPhBook.pbf");

         }

    }
}

the problem is when i try to read the file ctreated by my old application i receive serialization exception with this message "Unabel to find assembly 'PhoneBook,Version=1.0.0.0,Culture=neutral,PublicK eyToken=null"

and the source of exceptionis mscorlib.

when i read the same file with my old application(Which is the origin of the file)i have no problem and idon't know what to do to make my

adapter class work.so can somebody help please.