introductory-examples/program-organization/4/compilation - Compilation of the namespaces and client.

Lecture 4 - slide 19 : 29 Program 10

In Windows SDK
csc /target:library ex.cs
csc /target:library /reference:ex.dll client.cs

csc /t:library ex-equiv.cs
csc /t:library /r:ex-equiv.dll /out:client-equiv.dll client.cs