The Configuration API in .NET 2.0

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.NET 2.0 allows us to read, write, and encrypt sections in configuration files. In this article we will look into the configuration API to prepare for issues regarding permissions, key management, and application restarts.

The configuration API in .NET 2.0 gives us the ability to read and update configuration files, including web.config and machine.config files. You can read and write configuration files for your application, for another application on the same machine, or even an application on a different server. In this article, we will take a look at some of the highlights of the configuration API from the perspective of an ASP.NET developer, including how to use encryption and alternate configuration files.

AppSettings and Connection Strings

Two common tasks in ASP.NET development are reading application setting strings and connection strings from the configuration file. In .NET 2.0 these settings reside in the <appSettings> and <connectionStrings> respectively. A sample web.config file for an ASP.NET site might look like the following.


<?xml version="1.0"?>

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">

<appSettings>
<add key="message" value="Hello World!" />
</appSettings>

<connectionStrings>
<add name="AdventureWorks" connectionString="..."/>
<add name="pubs" connectionString="..."/>
</connectionStrings>

<system.web>
<compilation debug="true" />
<authentication mode="Windows"/>
<identity impersonate="true"/>
</system.web>

</configuration>


The configuration API for ASP.NET developers begins with the WebConfigurationManager class in the System.Web.Configuration namespace. The WebConfigurationManager includes static (shared) properties to fetch application settings and connection string. For example, to read the “message” appSetting from the web.config we could use . .......

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