title: TwainDotNet specific area scan
body: <p>In my application I am using TwainDotNet library and I am scanning a specific area from flatbed. </p>
  
  <pre><code>public Prasymas scanForm(Prasymas prasymas, bool isItFirstScan)
      {
  
          Enabled = false;
  
          _settings = new ScanSettings();
          _settings.UseDocumentFeeder = false;
          _settings.ShowTwainUI = false;
          _settings.ShowProgressIndicatorUI = true;
          _settings.UseDuplex = false;
          _settings.Resolution =
              false
              ? ResolutionSettings.Fax : ResolutionSettings.ColourPhotocopier;
          _settings.Page = PageSettings.Default;
  
          if (!isItFirstScan) 
          {
              _prasymas = prasymas;
              AreaSettings = new AreaSettings(Units.Centimeters, 0.0f, 0.0f, (float)(_prasymas.maxScanAukstis), 0.0f);                
          }
          else
          {
              _settings.Area = !false ? null : AreaSettings;
          }
          _settings.ShouldTransferAllPages = true;
  
  
          _settings.Rotation = new RotationSettings()
          {
              AutomaticRotate = false,
              AutomaticBorderDetection = false
          };
  
          try
          {
              _twain.SelectSource();
              _twain.StartScanning(_settings);
          }
          catch (TwainException ex)
          {
              if (ex.Message == "Error opening data source")
              {
                  _twain.SelectSource();
                  scanForm(_prasymas, isItFirstScan);
                  Enabled = true;
              }
              else
                  throw ex;
  
          }
          catch (Exception exc)
          {
              if (exc.Message == "Pasiuto skeneris")
              {
                  scanForm(_prasymas, true);                    
              }
              else
                  throw exc;
  
          }
  
          Enabled = true;
          return prasymas;
      }
  </code></pre>
  
  <p>but in result when scanning starts and a scan source is Twain driver it scans full page, but if I choose WIA driver I get specifically selected area.
  Main Idea is then App starts for the first time it scans full page, next time it scans only specific height of the page. </p>