Null if this is a ProjectRootElement.
Null if this has not been attached to a parent yet.
MSBuild is now included in Visual Studio instead of the .NET Framework. You can use MSBuild 12.0 side-by-side with versions previously deployed with the .NET Framework.For more information, see What's New in MSBuild 12.0.
Assembly: Microsoft.Build (in Microsoft.Build.dll)
Parent should only be set by ProjectElementContainer.