The name ‘Marshal’ does not exist in the current context

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C#3.0

C#

DirectX

directshow

I got the code below from the bitmapmixer sample (DirectShow.NET) and i tried to reimplement it. The original sample works fine. In my version when I try to compile i get errors.

private void AddHandlers()
    {
        // Add handlers for VMR purpose
        this.Paint += new PaintEventHandler(Form1_Paint); // for WM_PAINT
        this.Resize += new EventHandler(Form1_ResizeMove); // for WM_SIZE
        this.Move += new EventHandler(Form1_ResizeMove); // for WM_MOVE
        SystemEvents.DisplaySettingsChanged += new EventHandler(SystemEvents_DisplaySettingsChanged); // for WM_DISPLAYCHANGE
        handlersAdded = true;
    }

    private void RemoveHandlers()
    {
        // remove handlers when they are no more needed
        handlersAdded = false;
        this.Paint -= new PaintEventHandler(Form1_Paint);
        this.Resize -= new EventHandler(Form1_ResizeMove);
        this.Move -= new EventHandler(Form1_ResizeMove);
        SystemEvents.DisplaySettingsChanged -= new EventHandler(SystemEvents_DisplaySettingsChanged);
    }

ERRORs

Error 1 The name 'Marshal' does not exist in the current context Form1.cs
Error 2 The name 'Marshal' does not exist in the current context Form1.cs
Error 3 The name 'Form1_ResizeMove' does not exist in the current context Form1.cs
Error 4 The name 'Form1_Paint' does not exist in the current context Form1.cs
Error 5 The name 'Form1_ResizeMove' does not exist in the current context Form1.cs
Error 6 The name 'Form1_ResizeMove' does not exist in the current context Form1.cs
Error 7 The name 'SystemEvents_DisplaySettingsChanged' does not exist in the current context Form1.cs
Error 10 The name 'Form1_ResizeMove' does not exist in the current context Form1.cs
Error 11 The name 'SystemEvents_DisplaySettingsChanged' does not exist in the current context Form1.cs

Any help is appreciated.

Thanks.