Application Configuration Settings

In app.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appSettings>
        <add key="ServerName" value="rdv10t" />
    </appSettings>
</configuration>

In C# file:

string ServerName = System.Configuration.ConfigurationSettings.AppSettings["ServerName"];

See MSDN Help, <appsettings>.