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GdPictureImaging.TwainGetDuplexMode Method
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Returns the duplex scanning support.

C#
public int TwainGetDuplexMode();
Visual Basic
Public Function TwainGetDuplexMode() As Integer
Returns

Can be: 

0 = no support (or error) -> Use TwainGetLastResultCode() and TwainGetLastConditionCode() functions for diagnosing the error. 

1 = 1-pass duplex 

2 = 2-pass duplex

Remarks

Before using this function check that the TWAIN state is >= 4 (TWAIN_SOURCE_OPEN) 

To get the TWAIN state, use the TwainGetState() function.

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