How to convert C# to VB with Lamba Expressions

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VB

I have coverted the following code from C# using a online converter but can't seem to get it working. I get multiple errors. 'Expression Expected' for the Do, 'C is not declared', Missing Endif, 'Public event Tapped cannot be called directly'. Can anyone provide the proper VB code or any suggestions?

The Original C# code:

public void LoadGraphics(GraphicsDevice device)
     {
         _bg.BeginLoad(c =>
             {
                 _gui = c.Load<Window>(@"Data\GUI\Options");
                 RegisterInput();

                 if (_gui.Controls.ContainsKey("back"))
                     _gui.Controls["back"].Tapped += (s, v) => { if (PrevScreen != null) Manager.TransitionTo(PrevScreen); };

                 _renderer = new RenderEngine();
                 _gui.RegisterVisuals(_renderer);
                 _renderer.LoadGraphics(c, device);

                 _sb = new SpriteBatch(device);

                 IsLoaded = true;
             });
     }

The Coverted VB code:

Public Sub LoadGraphics(device As GraphicsDevice)
    _bg.BeginLoad(Function(c) Do
        _gui = c.Load(Of Window)("Data\GUI\Options")
        RegisterInput()

        If _gui.Controls.ContainsKey("back") Then
            _gui.Controls("back").Tapped += Function(s, v) Do
                If PrevScreen IsNot Nothing Then
                    Manager.TransitionTo(PrevScreen)
                End If
            End Function
        End If

        _renderer = New RenderEngine()
        _gui.RegisterVisuals(_renderer)
        _renderer.LoadGraphics(c, device)

        _sb = New SpriteBatch(device)

        IsLoaded = True
    End Function)
End Sub