How to fix the argument exception of binary formatter in c#

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C#

Hi,

I have serialized the student object and have created the abc.dat file.
The file is

[Serializable]
public class Student
{
public string Name { get; set; }

public int ID { get; set; }

public string Address { get; set; }


}


Now i have modified he datatype of ID to string then when i am trying
to de-serailize the abc.dat file then i am getting the arguement exception.

Error found:

A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll

[Serializable]
    public class Student
    {
        public string Name { get; set; }

        public <b><u></u>string</b> ID { get; set; }

        public string Address { get; set; }


    }

Thanks in advance