This example shows how to determine if TWAIN Scanning is available before you enable or disable scanning options within the application.
Private Sub Form_Load()
If ImgScan1.ScannerAvailable Then
mnuScanNew.Enabled = True
mnuScanAppendPage.Enabled = True
mnuScanInsertPage.Enabled = True
'If ScannerAvailable returns false, disable scanner-related
'menu options.
Else
mnuScanNew.Enabled = False
mnuScanAppendPage.Enabled = False
mnuScanInsertPage.Enabled = False
End If
End Sub