InvalidCastException Exception

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using System;
   
class MainClass
{
    public static void Main()
    {
        try
        {
            MainClass       MyObject = new MainClass();
            IFormattable    Formattable;
   
            Formattable = (IFormattable)MyObject;
   
            // wait for user to acknowledge the results
            Console.WriteLine("Hit Enter to terminate...");
            Console.Read();
        }
        catch(InvalidCastException)
        {
            Console.WriteLine("MyObject does not implement the IFormattable interface.");
        }
    }
}