I want to create a .bat file so I can just click on it so it can run:
svcutil.exe /language:cs /out:generatedProxy.cs /config:app.config http://localhost:800
As described here, about the Start command, the following would start your application with the parameters you've specified:
start "svcutil" "svcutil.exe" "language:cs" "out:generatedProxy.cs" "config:app.config" "http://localhost:8000/ServiceModelSamples/service"
"svcutil", after the start command, is the name given to the CMD window upon running the application specified. This is a required parameter of the start command.
"svcutil.exe" is the absolute or relative path to the application you want to run. Using quotation marks allows you to have spaces in the path.
After the application to start has been specified, all the following parameters are interpreted as arguments sent to the application.