FileSystem.FilePutObject Alternative

Question

Hi

I converted vb6 code into C# but facing an error.

Suppose we have Person 

--------------------------------------------

 

public class Person

{

private int intID;

private string strName;

private string strSurname;

public Person()

{

intID = -1;

strName = "";

strSurname = "";

}

public int ID

{

get

{

return intID;

}

set

{

intID = value;

}

}

public string Name

{

get

{

return strName;

}

set

{

strName = value;

}

}

public string Surname

{

get

{

return strSurname;

}

set

{

strSurname = value;

}

}

}

 --------------------------------------------------------------------

I want to write this class into file. I was using 

Person entP = new Person();

entP.ID = 1;

entP.Name= "john";

entP.Surname ="doe";

FileSystem.FileOpen(1, "test_file", OpenMode.Binary);

FileSystem.FilePutObject(1, entP,-1);

FileSystem.FileClose(1);

But it throws an error

Unhandled Exception: System.ArgumentException: File I/O with type 'Person' is not valid.

It seems FilePutObject does not support classes. Is there alternative way to do same task?

Please guide

thanks