Zip file in msbuild build event

SomeProject.csproj

<Target Name="Build">
  <ZipDir
    ZipFileName="MyZipFileName.zip"
    DirectoryName="MyDirectory"
  />
</Target>

<UsingTask TaskName="ZipDir" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v12.0.dll">
  <ParameterGroup>
    <ZipFileName ParameterType="System.String" Required="true" />
    <DirectoryName ParameterType="System.String" Required="true" />
  </ParameterGroup>
  <Task>
    <Reference Include="System.IO.Compression.FileSystem" />
    <Using Namespace="System.IO.Compression" />
    <Code Type="Fragment" Language="cs"><![CDATA[
      try
      {
        Log.LogMessage(string.Format("Zipping Directory {0} to {1}", DirectoryName, ZipFileName));
        ZipFile.CreateFromDirectory( DirectoryName, ZipFileName );
        return true;
      }
      catch(Exception ex)
      {
        Log.LogErrorFromException(ex);
        return false;
      }
    ]]></Code>
  </Task>
</UsingTask>