If you have a Web Part and want to make it safe anyway, you can add this information to the solution package, as shown in the following code.
<Solution SolutionId="{2E9DDE85-8822–42EC-3a92–E85537810BAA}"
xmlns="http://schemas.microsoft.com/sharepoint/">
<FeatureManifests />
<ApplicationResourceFiles />
<CodeAccessSecurity />
<DwpFiles />
<Resources />
<RootFiles />
<SiteDefinitionManifests />
<TemplateFiles />
<Assemblies>
<Assembly DeploymentTarget="WebApplication" Location="Apress.WebParts.dll">
<SafeControls>
<SafeControl Assembly="Apress.WebPart, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=a05eff78260564"
Namespace="Apress" TypeName="*" Safe="True"/>
</SafeControls>
</Assembly>
</Assemblies>
</Solution>
This technique is limited to your own Web Parts, where you have control over the packaging process. But it’s the safest way to add controls to web.config.
