Delphi for .NET Developer’s Guide

Units and Namespaces

Units are the individual source code modules that make up a Delphi program. A unit is a place for you to group functions and procedures that can be called from your main program. To be a unit, a source module must consist of at least three parts:

• A unit statement— Every unit must have as its first noncomment, nonwhitespace line a statement saying that it’s a unit and identifying the unit name. The name of the unit must always match the filename, excluding the file extension. For example, if you have a file named FooBar.pas, the statement would be

  unit FooBar;

• The interface part— After the unit statement, a unit’s next functional line of code should be the interface statement. Everything following this statement, up to the ...