Geocortex Workflow was designed to be a flexible tool for implementing business logic for mapping applications, and tightly integrates with ArcGIS Runtime SDK for .NET. You may want to use the ArcGIS Runtime SDK in your own custom activities; this article will explain how to reference ArcGIS Runtime SDK types in your custom activity or custom form elements for .NET applications.
The Geocortex Mobile Quickstart already references the ArcGIS Runtime SDK for .NET, so integrating the ArcGIS API is as easy as adding a
using statement to the top of your custom activity or form element.
Geocortex Workflow Server
It is not possible to reference the ArcGIS Runtime SDK for .NET in Geocortex Workflow Server, as the licensing does not allow for this usage.