Simple Service Error Handler – A Demo of a WCF Self-Hosted Service & Client "Tester" Windows Form Application Exchanging Error Messages : This project presents a simple Math Service and Client Application demonstration that implements error handling on the service and communications of its errors to the client. The Math Service is a self-hosted (service host) WCF application launched and managed with a simple console interface. The client “tester” has a simplified GUI user interface to quickly demo and test the service (Windows Form Application). The GUI has features to add, subtract, multiply, and divide two numbers (integers). The GUI does basic data validation then sends a request to the math service. After it receives the results from the math service, it displays the calculation result or any received error messages (faults) to the user. The objective of this project was not to demo a calculator application but the handling of errors on a service.