Hi Paul,

I've never used the OpenNetCF.Barcode class but I used to use the Socket
SDK for barcoding. What I used to do was have a class visible boolean to
indicate when the button had been press and then cleared this down in
the scan result event. i.e.

void btnScan_OnClick(object sender, EventArgs e){
  // Check to see if the scanner is active
  if(!ScanningInProgress){
    // If not set the flag to prevent a double trigger & GPF
    ScanningInProgress = true;
    // Trigger barcode scanner
  }
}

private void socketScanner_Event(ScannerEventArgs args) {
  // Process scanner event (Remove, Insert, Valid Data etc.)
  // Clear ScanningInProgress
  ScanningInProgress = false;
}

I hope this is of some help.
Ryan