Step 3: Add the barcode library as a reference
Right-click on the Solution Explorer, select Add Reference and use the Browse panel to enter the location of the barcode library called BarcodeLib.Barcode.dll:
Note: By default, the barcode library will be copied
to the right place when deploying on the IIS web server.
In the next step we add the buildImage method, Step 4: Add the buildImage method.