Explain how to retrieve information from the configuration file at run time. How would you store information in the configuration file at design time?

Explain how to retrieve information from the configuration file at run time. How would you store information in the configuration file at design time?
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Answer :

You must first create an instance of AppSettingsReader to read the configuration file. You can then call the GetValue method to read values represented in the configuration file. To add configuration file entries, you should create elements in the node of the configuration file. In the element, you should specify a value for the entry and a key that can be used to retrieve the entry. The value can be changed between executions of the application.

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