This should now build via

```
  msbuild .\lang\cs\Org.Apache.REEF.sln /p:Configuration="Debug" /p:Platform="x64" /m /tv:12.0

lang/cs/Org.Apache.REEF.Bridge/Org.Apache.REEF.Bridge.vcxproj

@@ -43,15 +43,31 @@ under the License.
     <RootNamespace>Org.Apache.REEF.Bridge</RootNamespace>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <!--
+    Switch the PlatformToolset based on the Visual Studio Version
+  -->
+  <PropertyGroup>
+    <!-- Assume Visual Studio 2015 / 14.0 as the default -->
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+  </PropertyGroup>
+  <!-- Visual Studio 2013 (12.0) -->
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '12.0'">
+    <PlatformToolset>v120</PlatformToolset>
+  </PropertyGroup>
+  <!-- Visual Studio 2015 (14.0) -->
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '14.0'">
+    <PlatformToolset>v140</PlatformToolset>
+  </PropertyGroup>
+  <!--
+    End of: Switch the PlatformToolset based on the Visual Studio Version
+  -->
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v140</PlatformToolset>
     <CLRSupport>true</CLRSupport>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v140</PlatformToolset>
     <CLRSupport>true</CLRSupport>
     <CharacterSet>Unicode</CharacterSet>
     <RestorePackages>true</RestorePackages>