Do you avoid using duplicate connection string in web.config?

Since we have many ways to use Connection String in .NET 2.0, it is probably that we are using duplicate connection string in web.config.

<connectionStrings>
    <add
        name="ConnectionString"
        connectionString="Server=(local);
        Database=NorthWind;"
    />
</connectionStrings>

<appSettings>
    <add key="ConnectionString" value="Server=(local);Database=NorthWind;"/>
</appSettings>