C# HttpClient. URL tester

Microsoft have a C# Code called? HttpClient? that demonstrates how to make HTTP requests and record the time to the last byte (TTLB). The URL's it tests has to be hardcoded into the code before it is compiled into a .Net executable.? The script also currently allows only one URL to be tested I would like the original code changed so more than one URL can be tested, (one after the other in turn), and the list of URL's are stored in a config file instead of in the code.? This would mean adding new URLs would be simple. Id also like it to be ran? as a Windows Service if that is possible.? The original code when compiled and ran as an exec, also displays a window of the TTLB for each URL as its being tested.? This isnt required the program should run silently.? Currently the program writes an error to a text file if the URL does not "reply" to the test.? This function needs to remain and is essential. ## Deliverables Will Require the source code as part of the deliverable.