Problem modifying the value of a boxed value

I want to show how to change the value of a member variable in a boxed item.
The C# code works (from a course given by U2U).
My 'translation' in VB.NET doesn't work! I don't get an error, but the value of the
point remains the same!
What am I doing wrong?

Thank you

Pierre Schavey

using System;
using System.Drawing;

namespace BoxingStruct
{ class Class1
{ static void Main()
{
Point p = new Point(10, 20);
object op1 = p;
Console.WriteLine(p);
op1.GetType().GetProperty("X").SetValue(op1, 777, null);
Console.WriteLine(p);
Console.ReadLine();
}
}
}


Imports System.Text
Imports System.Drawing

Module BoxingTest
Sub Go5()
Dim p As Point = New Point(10, 20)
Dim op1 As Object
op1 = p
Console.WriteLine(p)
op1.GetType().GetProperty("X").SetValue(op1, 777, Nothing)
Console.WriteLine(p)
Console.ReadLine()
End Sub

Sub Main()
Go5()
End Sub
End Module

What error are you getting and what line is it on?

What error are you getting and what line is it on?

I don't get an error. But with the C# code I can change the value of the X property. This doesn't work in VB.NET, the code does nothing at all.
When I use GetValue("X", Nothing), I can 'read' the value of the property, the same way as in C#.
My question is: why is SetValue working in C# and not in VB.NET?