Serializtion problem in C#

[Falcon Eyes]

Hi Every Body
I tried to write phone index Application,but i got a problem with the serialization of my object,and i don't know why can some body help please and below is my code in detail and i attached the error message

main form code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;


namespace PHIndex
{
public partial class MainFrm : Form
{

CTeleRecord phoneRecord;

public MainFrm()
{
InitializeComponent();

phoneRecord = new CTeleRecord();

phoneRecord.errorEvnt += new errorEventHandler(ErrorHnd);

}

private void button1_Click(object sender, EventArgs e)
{
phoneRecord.GSName = textBox1.Text;
phoneRecord.GShomeNumber = textBox2.Text;
FileStream outPutSt = new FileStream("test.bin", FileMode.Create, FileAccess.Write);
BinaryFormatter outBinFormater = new BinaryFormatter();
outBinFormater.Serialize(outPutSt, phoneRecord);
}

private void button2_Click(object sender, EventArgs e)
{
BinaryFormatter inpuBinFormater = new BinaryFormatter();
FileStream inPutSt = new FileStream("test.bin", FileMode.Open, FileAccess.Read);
phoneRecord = (CTeleRecord)inpuBinFormater.Deserialize(inPutSt);
textBox1.Text= phoneRecord.GSName;
textBox2.Text= phoneRecord.GShomeNumber;
}
void ErrorHnd(object sender, myEventsArg e)
{
MessageBox.Show(e.GetErrorMessage,"Error Code"+e.GetErrorCode);
}

}
}

and the telephone Record Class code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using PhoneIndex;

namespace PHIndex
{
///class for holding telephone index object
public delegate void errorEventHandler(object sender, myEventsArg e);

[Serializable]
class CTeleRecord

{


string name;
string homeNumber;
string mobileNumber;
string workNumber;
string emailAddress;
bool errorFlag;
public event errorEventHandler errorEvnt;

/// <summary>
/// This Fn will fire the error event
/// </summary>
/// <param name="e"></param>
void fireError(myEventsArg e)
{
if (errorEvnt != null)
{
///invoke the delegate object
errorEvnt(this,e);
}
}


/// <summary>
/// reset error flag
/// </summary>
public void ResetErrorFlag()
{ errorFlag = false; }

public int getRecordLength()
{


return (name.Length + homeNumber.Length + mobileNumber.Length + workNumber.Length
+ emailAddress.Length);

}

public void resetTelRecordObj()
{
name = "";
homeNumber = "";
mobileNumber = "";
workNumber = "";
emailAddress = "";
}

/// <summary>
/// Property for Get or Set home phone number
/// </summary>
public string GShomeNumber
{
get
{
return homeNumber;
}
set
{
if (value.Length > 0)
try
{
//This property for checking validation of number;
Convert.ToInt64(value);
}

catch (FormatException)
{

//errorFlag = true;

myEventsArg e1 = new myEventsArg(1, "Numbers can't be a string");
fireError(e1);
}

try
{
if (value.Length == 0 || value.Length == 8 || value.Length == 10 || value.Length == 13)
homeNumber = value;
else
throw new Exception("Invalid Home Telephone Number Length (8 or 10 or 13 number)");
}
catch (Exception)
{
myEventsArg e11 = new myEventsArg(1, "Invalid Home Telephone Number Length");
fireError(e11);
}

}
}

/// <summary>
/// Property for Get or Set work telephone number
/// </summary>
public string GSWorkNumber
{
get{return workNumber;}

set
{
if (value.Length > 0)
try
{
//This property for checking validation of number;
Convert.ToInt64(value)
;
}

catch (FormatException)
{

myEventsArg e3 = new myEventsArg(3, "Numbers can't be a string");
fireError(e3);
}

try
{
if (value.Length == 0 || value.Length == 8 || value.Length == 10 || value.Length == 13)
workNumber = value;
else
throw new Exception("Invalid Work Telephone Number Length (8 or 10 or 13 number)");
}
catch (Exception error)
{

myEventsArg e33 = new myEventsArg(3, "Invalid Work Telephone Number Length");
fireError(e33);

}

}
}

/// <summary>
/// Property for Get or Set mobile phone number
/// </summary>
public string GSmobileNumber
{
get
{
return mobileNumber;
}
set
{
if (value.Length > 0)
try
{
//This property for checking validation of number;
Convert.ToInt64(value)
;
}

catch (FormatException)
{

myEventsArg e2 = new myEventsArg(2, "Numbers can't be a string");
fireError(e2);
}

try
{
if (value.Length == 0 || value.Length == 10 || value.Length == 13)
mobileNumber = value;
else
throw new Exception("Invalid Home Telephone Number Length (8 or 10 or 13 number)");
}
catch (Exception)
{

myEventsArg e22 = new myEventsArg(2, "Invalid Home Telephone Number Length");
fireError(e22);
}
}
}
/// <summary>
/// Property for Get or Set user name
/// </summary>
public string GSName
{
get
{
return name;
}

set
{
try
{
if (value.Length == 0 || value.Length <= 50)
name = value;
else
throw new Exception("Invalid Name Length (Max 50 Character)");
}
catch (Exception)
{

myEventsArg e0 = new myEventsArg(0, "You Wrote " + value.Length + "char" + " (Max 30 Character)");
fireError(e0);
}
}
}
/// <summary>
/// Property for Get or Set user email
/// </summary>

public string GSEmail
{
get
{
return emailAddress;
}
set
{
try
{
if (value.Contains('@') && value.Contains('.') || value.Contains(""))
emailAddress = value;

else
throw new Exception("Invalid Email format");
}

catch (Exception)
{

myEventsArg e4 = new myEventsArg(4, "Invalid Email format");
fireError(e4);
}
}
}
/// <summary>
/// get error flag status
/// </summary>
public bool ErrorFlag
{ get { return errorFlag; } }

/// <summary>
/// Return the Record Length
/// </summary>
public int GetRecordLength
{get{ return getRecordLength(); }}


}
}

and event argument class code is

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PHIndex
{
public class myEventsArg : EventArgs
{
public myEventsArg(int ercode,string erCodeMesage)
{
errorCode = ercode;
errorMessage = erCodeMesage;
}
private int errorCode;
private string errorMessage;

public int GetErrorCode
{get { return errorCode; }}

public string GetErrorMessage
{get{return errorMessage;}}
}
}

the error in detail

System.Runtime.Serialization.SerializationException was unhandled
  Message="Type 'PhoneIndex.Form1' in Assembly 'PhoneIndex, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable."
  Source="mscorlib"
  StackTrace:
       at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type)
       at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context)
       at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo()
       at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
       at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter)
       at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
       at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck)
       at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck)
       at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph)
       at PhoneIndex.Form1.Save() in E:\VC++  & VC# Projects\PhoneIndex\PhoneIndex\Form1.cs:line 264
       at PhoneIndex.Form1.saveToolStripMenuItem_Click(Object sender, EventArgs e) in E:\VC++  & VC# Projects\PhoneIndex\PhoneIndex\Form1.cs:line 225
       at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
       at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
       at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
       at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
       at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
       at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
       at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
       at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.ToolStrip.WndProc(Message& m)
       at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at PhoneIndex.Program.Main() in E:\VC++  & VC# Projects\PhoneIndex\PhoneIndex\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: