How can I display the Build number and/or DateTime of last build in my app?

I know that I can do this to get the app's official (release/publish) version number:

string version = Assembly.GetExecutingAssembly().GetName().Version.ToString();  
this.Text = String.Format("Platypi R Us - version {0}", version);

...but this only shows a "Publish version" of my app* ("1.0.0.0"). I want to show the build number.

• From the Project | Properties | Publish tab.

Barring that, or in addition to that, I'd like to show the date and time of the last build, so that it says "Platypi R Us - version 3.14 (7/17/2012 16:22)"