Add to <Project> in.csproj

  <Import Project="Neko2k.RandomBuildString.targets"/>

AssemblyInfo.cs

using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

// General Information about an assembly is controlled through the following 
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("Neko2k.RandomBuildString")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("Neko2k.RandomBuildString")]
[assembly: AssemblyCopyright("Copyright ©  2014")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]

// Setting ComVisible to false makes the types in this assembly not visible 
// to COM components.  If you need to access a type in this assembly from 
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]

// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("5ec5790b-f451-4b20-95b4-89a72ca64a7e")]

// Version information for an assembly consists of the following four values:
//
//      Major Version
//      Minor Version 
//      Build Number
//      Revision
//
// You can specify all the values or you can default the Build and Revision Numbers 
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0."+Neko2k.BuildStrings.RandomBuildString)]

Neko2k.RandomBuildString.targets

<?xml version="1.0" encoding="utf-8" ?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Neko2kRandomBuildStringFile>.neko2k.RandomBuildString.cs</Neko2kRandomBuildStringFile>
    <Neko2kRandomBuildString>$([System.Guid]::NewGuid())</Neko2kRandomBuildString>
  </PropertyGroup>
  <ItemGroup>
    <Compile Include="$(Neko2kRandomBuildStringFile)">
      <Visible>false</Visible>
    </Compile>
  </ItemGroup>
  <Target BeforeTargets="BeforeCompile" Name="WriteNeko2kRandomBuildString">
    <Delete Files="$(Neko2kRandomBuildStringFile).new"/>
    <WriteLinesToFile File="$(Neko2kRandomBuildStringFile).new" Lines="namespace Neko2k { internal static partial class BuildStrings { public const string RandomBuildString = &quot;$(Neko2kRandomBuildString.Replace('\', '\\').Replace('&quot;', '\&quot;'))&quot;%3b; } }"/>
    <Move DestinationFiles="$(Neko2kRandomBuildStringFile)" SourceFiles="$(Neko2kRandomBuildStringFile).new"/>
  </Target>
</Project>