Communicating with IDTech Devices requires the following library to be referenced by the project:

IDTechSDK.dll

Add the reference as you would any .NET managed library reference. The most direct method would be right-click on the "References" in the Solution Explorer for the project, select "Add Reference...", click "Browse..." and locate IDTechSDK.dll.

IDTechSDK.dll has a dependency of Microsoft .NET 4.5 or greater. Please make sure your final application installer checks for this dependency and installs it if it is not on the destination system. IDTechCommDll.dll has a dependency of C++ Redistributable for VS2013 (32-bit). Please make sure your final application installer checks for this dependency and installs it if it is not on the destination system.

In addition, the following libraries need to be added to project folder and included in with the application distribution:

Vendi_config.dll
Vendi_ctls.dll
Vendi_device.dll
Vendi_msr.dll
Vendi_parse.dll

You can add these libraries by right-clicking on your project name in the solution Explorer and select "Add->Existing Item..." or keyboard shortcut Shift-Alt-A.

Once all three items are added, set their properties to "Copy if newer" so they will be included in the final applications destination folder.