You can set the ServiceUri property in your application code, but you will typically set the value in your application configuration file. This enables you to change the service location without recompiling your code.
When you set the service location programmatically, you must specify the complete service URI, which will always end with "Profile_JSON_AppService.axd".
This class contains a link demand at the class level that applies to all members. A SecurityException is thrown when the immediate caller does not have full-trust permission. For details about security demands, see Link Demands.