Sometimes it is required to change the contents of ‘App.config’ file. Assume if we are allowing user to override things like taxrates, which we keep on the ‘App.config’.
On the App.config, we have a key ‘TaxRate’ which has the value ‘15’.
And we have to change it to ‘20’. We can use the following syntax:
**Please note : The changes are temporary, when running on debug mode. But will be permanent when run using the built application (Executable)