Code Injection works in C# too!
52 characters

}static Program(){System.Console.Write(0&lt;1);for(;;);


so the whole thing becomes:

class Program
{
    static void Main()
    {
        System.Console.Write( "False" );
    }
    static Program()
    {
        System.Console.Write( 0 &lt; 1 ); 
        for ( ; ; ) ;
    }
}