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Setting and Retrieving Custom Application Settings
The final configuration element is a special one because it allows you to configure your own custom application settings, which can then be easily retrieved from within your ASP.NET applications.
<appSettings>
The <appSettings> element allows you to create your own configuration settings as key/value pairs. You can use this configuration element to store configuration information such as DSNs for data access, and then retrieve them in your application using the following syntax:
DimDSNAsString
DSN=ConfigurationSettings.AppSettings("dsn")
This is assuming that you’ve stored the DSN using “dsn” as the key.The <appSettings> element has the following syntax:
<appSettings>
<add
key="string"
value="string"/>
<clear/>
<remove
key="string"/>
</appSettings>
Table B-20 describes the <appSettings> element attributes in more detail.
Element | Attribute | Description |
|---|---|---|
<appSettings> | Creates key/value pairs that can be retrieved using ConfigurationSettings.AppSettings(key). | |
<add> | Adds a key/value pair. | |
key | Specifies the name of the key to use to retrieve the value. | |
value | Specifies the value to be returned. | |
<clear> | Removes all key/value pairs added (or inherited) by the current Web.config file. | |
<remove> | key | Removes the specified name/value pair added (or inherited) by the current Web.config file. |
