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    private static readonly BitVector32.Section fDtrControl;

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        fDtrControl = BitVector32.CreateSection(2, previousSection);

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        previousSection = BitVector32.CreateSection(1, fDtrControl);

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    public DtrControl DtrControl

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        get { return (DtrControl)Flags[fDtrControl]; }

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        set { Flags[fDtrControl] = (int)value; }

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See also DtrControl and RtsControl

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fDtrControl = BitVector32.CreateSection(2, previousSection);

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You will notice that fDtrControl expects 2 and fRtsControl expect 3. Why?

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The reason is that the highest value within enum DtrControl is 2, and highest valye within enum RtsControl is 3.

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myDcb.DtrControl = DtrControl.Disable; // DtrControl is an enum

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public enum DtrControl : int

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Public Enum DtrControl As Integer

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End Enum ' DtrControl

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Documentation

[DtrControl] on MSDN