Removed OldToolsVersion

src/Samples/CSharp/APISampleUnitTests/APISampleUnitTestsCS.csproj

@@ -4,7 +4,6 @@
   <PropertyGroup>
     <DeployToSamplesSubfolder>false</DeployToSamplesSubfolder>
     <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
-    <OldToolsVersion>4.0</OldToolsVersion>
     <RoslynProjectType>UnitTest</RoslynProjectType>
   </PropertyGroup>
   <ItemGroup Label="Project References">

src/Samples/CSharp/ConvertToAutoProperty/ConvertToAutoPropertyCS.csproj

@@ -2,7 +2,6 @@
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\build\Targets\VSL.Settings.targets" />
   <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
     <ImportVSSDKTargets>true</ImportVSSDKTargets>
     <ScrubbedSamplePath>CSharp\ConvertToAutoProperty</ScrubbedSamplePath>
   </PropertyGroup>

src/Samples/CSharp/ConvertToConditional/Impl/ConvertToConditionalCS.csproj

@@ -2,7 +2,6 @@
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
   <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
     <ImportVSSDKTargets>true</ImportVSSDKTargets>
   </PropertyGroup>
   <ItemGroup Label="Project References">

src/Samples/CSharp/CopyPasteWithUsing/CopyPasteWithUsing.csproj

@@ -2,7 +2,6 @@
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\build\Targets\VSL.Settings.targets" />
   <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
     <ImportVSSDKTargets>true</ImportVSSDKTargets>
   </PropertyGroup>
   <ItemGroup Label="Project References">

src/Samples/CSharp/ImplementNotifyPropertyChanged/Impl/ImplementNotifyPropertyChangedCS.csproj

@@ -2,7 +2,6 @@
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
   <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
     <ImportVSSDKTargets>true</ImportVSSDKTargets>
   </PropertyGroup>
   <ItemGroup Label="Project References">

src/Samples/CSharp/MakeConst/Impl/MakeConstCS.csproj

@@ -4,9 +4,6 @@
     <UseRoslynAnalyzers>false</UseRoslynAnalyzers>
   </PropertyGroup>
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
-  <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
-  </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\..\..\src\Compilers\Core\Portable\CodeAnalysis.csproj">
       <Project>{1EE8CAD3-55F9-4D91-96B2-084641DA9A6C}</Project>

src/Samples/CSharp/RefOutModifier/AddOrRemoveRefOutModifier.csproj

 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\build\Targets\VSL.Settings.targets" />
-  <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
-  </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\..\src\Workspaces\CSharp\Portable\CSharpWorkspace.csproj">
       <Project>{21B239D0-D144-430F-A394-C066D58EE267}</Project>

src/Samples/VisualBasic/APISampleUnitTests/APISampleUnitTestsVB.vbproj

@@ -3,7 +3,6 @@
   <Import Project="..\..\..\..\build\Targets\VSL.Settings.targets" />
   <PropertyGroup>
     <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
-    <OldToolsVersion>4.0</OldToolsVersion>
     <RoslynProjectType>UnitTest</RoslynProjectType>
   </PropertyGroup>
   <ItemGroup Label="Project References">

src/Samples/VisualBasic/ConvertToAutoProperty/Impl/ConvertToAutoPropertyVB.vbproj

 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
-  <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
-  </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\..\..\src\Compilers\Core\Portable\CodeAnalysis.csproj">
       <Project>{1EE8CAD3-55F9-4D91-96B2-084641DA9A6C}</Project>

src/Samples/VisualBasic/ImplementNotifyPropertyChanged/Impl/ImplementNotifyPropertyChangedVB.vbproj

 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
-  <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
-  </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\..\..\src\Compilers\Core\Portable\CodeAnalysis.csproj">
       <Project>{1EE8CAD3-55F9-4D91-96B2-084641DA9A6C}</Project>

src/Samples/VisualBasic/MakeConst/Impl/MakeConstVB.vbproj

@@ -4,9 +4,6 @@
     <UseRoslynAnalyzers>false</UseRoslynAnalyzers>
   </PropertyGroup>
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
-  <PropertyGroup>
-    <OldToolsVersion>4.0</OldToolsVersion>
-  </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\..\..\src\Compilers\Core\Portable\CodeAnalysis.csproj">
       <Project>{1EE8CAD3-55F9-4D91-96B2-084641DA9A6C}</Project>

src/Samples/VisualBasic/RemoveByVal/Impl/RemoveByValVB.vbproj

@@ -3,7 +3,6 @@
   <Import Project="..\..\..\..\..\build\Targets\VSL.Settings.targets" />
   <PropertyGroup>
     <DeployToSamplesSubfolder>true</DeployToSamplesSubfolder>
-    <OldToolsVersion>4.0</OldToolsVersion>
   </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\..\..\src\Compilers\Core\Portable\CodeAnalysis.csproj">

src/Tools/BuildBoss/ProjectUtil.cs

@@ -37,6 +37,7 @@ internal bool CheckAll(TextWriter textWriter)
                 allGood &= CheckForProperty(textWriter, "FileAlignment");
                 allGood &= CheckForProperty(textWriter, "FileUpgradeFlags");
                 allGood &= CheckForProperty(textWriter, "UpgradeBackupLocation");
+                allGood &= CheckForProperty(textWriter, "OldToolsVersion");
             }
 
             return allGood;