Best Practice logging pattern for Silverlight application

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProductVersion>10.0.30729</ProductVersion>
    <SchemaVersion>2.0</SchemaVersion>
    <ProjectGuid>{BFF79AD6-68F7-46CA-8AFD-5F0DF83717B8}</ProjectGuid>
    <ProjectTypeGuids>{A1591282-1198-4647-A2B1-27E5FF5F6F3B};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}</ProjectTypeGuids>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>BusinessAppMVVM</RootNamespace>
    <AssemblyName>BusinessAppMVVM</AssemblyName>
    <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
    <SilverlightVersion>$(TargetFrameworkVersion)</SilverlightVersion>
    <SilverlightApplication>true</SilverlightApplication>
    <SupportedCultures>
    </SupportedCultures>
    <XapOutputs>true</XapOutputs>
    <GenerateSilverlightManifest>true</GenerateSilverlightManifest>
    <XapFilename>BusinessAppMVVM.xap</XapFilename>
    <SilverlightManifestTemplate>Properties\AppManifest.xml</SilverlightManifestTemplate>
    <SilverlightAppEntry>BusinessAppMVVM.App</SilverlightAppEntry>
    <TestPageFileName>TestPage.html</TestPageFileName>
    <CreateTestPage>true</CreateTestPage>
    <ValidateXaml>true</ValidateXaml>
    <EnableOutOfBrowser>false</EnableOutOfBrowser>
    <OutOfBrowserSettingsFile>Properties\OutOfBrowserSettings.xml</OutOfBrowserSettingsFile>
    <UsePlatformExtensions>false</UsePlatformExtensions>
    <ThrowErrorsInValidation>true</ThrowErrorsInValidation>
    <LinkedServerProject>..\BusinessAppMVVM.Web\BusinessAppMVVM.Web.csproj</LinkedServerProject>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>Bin\Debug</OutputPath>
    <DefineConstants>DEBUG;TRACE;SILVERLIGHT</DefineConstants>
    <NoStdLib>true</NoStdLib>
    <NoConfig>true</NoConfig>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>Bin\Release</OutputPath>
    <DefineConstants>TRACE;SILVERLIGHT</DefineConstants>
    <NoStdLib>true</NoStdLib>
    <NoConfig>true</NoConfig>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="System.ComponentModel.DataAnnotations" />
    <Reference Include="System.Runtime.Serialization" />
    <Reference Include="System.Windows" />
    <Reference Include="mscorlib" />
    <Reference Include="system" />
    <Reference Include="System.Core" />
    <Reference Include="System.Net" />
    <Reference Include="System.ServiceModel" />
    <Reference Include="System.Windows.Controls.Data.DataForm.Toolkit, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>Libs\System.Windows.Controls.Data.DataForm.Toolkit.dll</HintPath>
    </Reference>
    <Reference Include="System.Windows.Controls.Data.Input" />
    <Reference Include="System.ServiceModel.DomainServices.Client" />
    <Reference Include="System.ServiceModel.DomainServices.Client.Web" />
    <Reference Include="System.ServiceModel.Web.Extensions" />
    <Reference Include="System.Xml" />
    <Reference Include="System.Windows.Browser" />
    <Reference Include="System.Windows.Controls" />
    <Reference Include="System.Windows.Controls.Navigation" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="..\BusinessAppMVVM.Web\Resources\RegistrationDataResources.Designer.cs">
      <Link>Web\Resources\RegistrationDataResources.Designer.cs</Link>
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
      <DependentUpon>RegistrationDataResources.resx</DependentUpon>
    </Compile>
    <Compile Include="..\BusinessAppMVVM.Web\Resources\ValidationErrorResources.Designer.cs">
      <Link>Web\Resources\ValidationErrorResources.Designer.cs</Link>
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
      <DependentUpon>ValidationErrorResources.resx</DependentUpon>
    </Compile>
    <Compile Include="App.xaml.cs">
      <DependentUpon>App.xaml</DependentUpon>
    </Compile>
    <Compile Include="Assets\Resources\ApplicationStrings.Designer.cs">
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
      <DependentUpon>ApplicationStrings.resx</DependentUpon>
    </Compile>
    <Compile Include="Assets\Resources\ErrorResources.Designer.cs">
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
      <DependentUpon>ErrorResources.resx</DependentUpon>
    </Compile>
    <Compile Include="BaseClasses\ViewModelBase.cs" />
    <Compile Include="GlobalSuppressions.cs" />
    <Compile Include="Helpers\LoggerManager.cs" />
    <Compile Include="Models\LoginInfo.cs" />
    <Compile Include="Models\User.partial.cs" />
    <Compile Include="Models\RegistrationData.partial.cs" />
    <Compile Include="Controls\BusyIndicator.cs" />
    <Compile Include="Controls\VisualStates.cs" />
    <Compile Include="Helpers\DataFieldExtensions.cs" />
    <Compile Include="Helpers\NotOperatorValueConverter.cs" />
    <Compile Include="Helpers\TargetNullValueConverter.cs" />
    <Compile Include="Assets\Resources\ApplicationResources.cs" />
    <Compile Include="Assets\Resources\SecurityQuestions.Designer.cs">
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
      <DependentUpon>SecurityQuestions.resx</DependentUpon>
    </Compile>
    <Compile Include="Service References\BusinessAppServiceModel\Reference.cs">
      <AutoGen>True</AutoGen>
      <DesignTime>True</DesignTime>
      <DependentUpon>Reference.svcmap</DependentUpon>
    </Compile>
    <Compile Include="Views\ErrorWindow.xaml.cs">
      <DependentUpon>ErrorWindow.xaml</DependentUpon>
    </Compile>
    <Compile Include="Views\About.xaml.cs">
      <DependentUpon>About.xaml</DependentUpon>
    </Compile>
    <Compile Include="Views\Home.xaml.cs">
      <DependentUpon>Home.xaml</DependentUpon>
    </Compile>
    <Compile Include="MainPage.xaml.cs">
      <DependentUpon>MainPage.xaml</DependentUpon>
    </Compile>
    <Compile Include="Properties\AssemblyInfo.cs" />
    <Compile Include="Views\Login\LoginStatus.xaml.cs">
      <DependentUpon>LoginStatus.xaml</DependentUpon>
    </Compile>
    <Compile Include="Views\Login\LoginForm.xaml.cs">
      <DependentUpon>LoginForm.xaml</DependentUpon>
    </Compile>
    <Compile Include="Views\Login\LoginRegistrationWindow.xaml.cs">
      <DependentUpon>LoginRegistrationWindow.xaml</DependentUpon>
    </Compile>
    <Compile Include="Views\Login\RegistrationForm.xaml.cs">
      <DependentUpon>RegistrationForm.xaml</DependentUpon>
    </Compile>
  </ItemGroup>
  <ItemGroup>
    <ApplicationDefinition Include="App.xaml">
      <Generator>MSBuild:MarkupCompilePass1</Generator>
      <SubType>Designer</SubType>
    </ApplicationDefinition>
    <Page Include="Assets\Styles.xaml">
      <Generator>MSBuild:MarkupCompilePass1</Generator>
      <SubType>Designer</SubType>
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </Page>
    <Page Include="Controls\BusyIndicator.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Views\ErrorWindow.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </Page>
    <Page Include="Views\About.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </Page>
    <Page Include="Views\Home.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </Page>
    <Page Include="MainPage.xaml">
      <Generator>MSBuild:MarkupCompilePass1</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Views\Login\LoginStatus.xaml">
      <Generator>MSBuild:MarkupCompilePass1</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Views\Login\LoginForm.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </Page>
    <Page Include="Views\Login\LoginRegistrationWindow.xaml">
      <Generator>MSBuild:MarkupCompilePass1</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Views\Login\RegistrationForm.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:MarkupCompilePass1</Generator>
    </Page>
  </ItemGroup>
  <ItemGroup>
    <None Include="Properties\AppManifest.xml" />
    <None Include="Service References\BusinessAppServiceModel\BusinessAppMVVM.BusinessAppServiceModel.CompositeType.datasource">
      <DependentUpon>Reference.svcmap</DependentUpon>
    </None>
    <None Include="Service References\BusinessAppServiceModel\Service1.wsdl" />
    <None Include="Service References\BusinessAppServiceModel\Service1.xsd">
      <SubType>Designer</SubType>
    </None>
    <None Include="Service References\BusinessAppServiceModel\Service11.xsd">
      <SubType>Designer</SubType>
    </None>
    <None Include="Service References\BusinessAppServiceModel\Service12.xsd">
      <SubType>Designer</SubType>
    </None>
    <Content Include="ServiceReferences.ClientConfig" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Libs\System.Windows.Controls.Data.DataForm.Toolkit.dll" />
  </ItemGroup>
  <ItemGroup>
    <EmbeddedResource Include="..\BusinessAppMVVM.Web\Resources\RegistrationDataResources.resx">
      <Link>Web\Resources\RegistrationDataResources.resx</Link>
      <Generator>PublicResXFileCodeGenerator</Generator>
      <LastGenOutput>RegistrationDataResources.Designer.cs</LastGenOutput>
    </EmbeddedResource>
    <EmbeddedResource Include="..\BusinessAppMVVM.Web\Resources\ValidationErrorResources.resx">
      <Link>Web\Resources\ValidationErrorResources.resx</Link>
      <Generator>PublicResXFileCodeGenerator</Generator>
      <LastGenOutput>ValidationErrorResources.Designer.cs</LastGenOutput>
    </EmbeddedResource>
    <EmbeddedResource Include="Assets\Resources\ApplicationStrings.resx">
      <Generator>PublicResXFileCodeGenerator</Generator>
      <LastGenOutput>ApplicationStrings.Designer.cs</LastGenOutput>
      <CustomToolNamespace>BusinessAppMVVM</CustomToolNamespace>
    </EmbeddedResource>
    <EmbeddedResource Include="Assets\Resources\ErrorResources.resx">
      <Generator>PublicResXFileCodeGenerator</Generator>
      <LastGenOutput>ErrorResources.Designer.cs</LastGenOutput>
      <CustomToolNamespace>BusinessAppMVVM</CustomToolNamespace>
    </EmbeddedResource>
    <EmbeddedResource Include="Assets\Resources\SecurityQuestions.resx">
      <Generator>PublicResXFileCodeGenerator</Generator>
      <LastGenOutput>SecurityQuestions.Designer.cs</LastGenOutput>
      <CustomToolNamespace>BusinessAppMVVM</CustomToolNamespace>
    </EmbeddedResource>
  </ItemGroup>
  <ItemGroup>
    <None Include="Properties\OutOfBrowserSettings.xml" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="ViewModel\" />
  </ItemGroup>
  <ItemGroup>
    <WCFMetadata Include="Service References\" />
  </ItemGroup>
  <ItemGroup>
    <WCFMetadataStorage Include="Service References\BusinessAppServiceModel\" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Service References\BusinessAppServiceModel\Service1.disco" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Service References\BusinessAppServiceModel\configuration91.svcinfo" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Service References\BusinessAppServiceModel\configuration.svcinfo" />
  </ItemGroup>
  <ItemGroup>
    <None Include="Service References\BusinessAppServiceModel\Reference.svcmap">
      <Generator>WCF Proxy Generator</Generator>
      <LastGenOutput>Reference.cs</LastGenOutput>
    </None>
  </ItemGroup>
  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Silverlight\$(SilverlightVersion)\Microsoft.Silverlight.CSharp.targets" />
  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
       Other similar extension points exist, see Microsoft.Common.targets.
  <Target Name="BeforeBuild">
  </Target>
  <Target Name="AfterBuild">
  </Target>
  -->
  <ProjectExtensions>
    <VisualStudio>
      <FlavorProperties GUID="{A1591282-1198-4647-A2B1-27E5FF5F6F3B}">
        <SilverlightProjectProperties />
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>
</Project>