build.targets file for injecting version from a text-file to the AssemblyInfo.cs file: http://wp.me/p3Uuaw-Hj

build.targets

<?xml version="1.0" encoding="utf-8" ?>
<Project ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

    <!-- Inject a version from a text-file into AssemblyVersion.cs . We do this 
         so that it's easier for the application to know its own version [by 
         reading the text file].
    -->
    <Import Project="$(ProjectDir)..\packages\MSBuildTasks.1.5.0.196\tools\MSBuild.Community.Tasks.Targets" /> 
    <Target Name="InjectVersion" BeforeTargets="BeforeBuild">
        <!-- Read the version from our text file. This appears to automatically 
				     trim (probably per line). This is located in the project root so 
						 that we copy the file to the output-path rather than establishing 
						 a whole Properties/ directory in the output path.
				-->
        <ReadLinesFromFile File="$(ProjectDir)Properties\executable.version">
            <Output TaskParameter="Lines" PropertyName="ExecutableVersion" />
        </ReadLinesFromFile>

        <!-- Print it to the build output whether we're in debug-mode or not. -->
        <Message Importance="High" Text="Executable version is [$(ExecutableVersion)]"/>

        <!-- Copy our template file to the output file. -->
        <Copy SourceFiles="$(ProjectDir)Properties/AssemblyInfo.cs.use_this" DestinationFiles="$(ProjectDir)Properties/AssemblyInfo.cs"/>

        <!-- Do an RX replace of the version on to the token. -->

        <ItemGroup>
           <WriteFiles Include='$(ProjectDir)Properties/AssemblyInfo.cs' />
        </ItemGroup>

        <FileUpdate  
           Files="@(WriteFiles)"
           Regex="__EXECUTABLE_VERSION__"
           ReplacementText="$(ExecutableVersion)"
        />

        <!-- Replace the cautionary note about how to use the file with one 
             saying that any changes will be lost (if made to the output file). 
        -->
        <FileUpdate  
           Files="@(WriteFiles)"
           Regex="// TEMPLATE:.+"
           ReplacementText="// THIS FILE IS GENERATED! Apply any changes to 'AssemblyInfo.cs.use_this', instead."
        />
    </Target>
</Project>