Index

H

handles

accessing objects, 113

collections of, 220

returning from methods, 97

Hashtable class, 556, 573, 733

instantiating, 483

iterating through keys and values of, 494

methods, 485

Add method, 485

Clear method, 485

ContainsKey method, 485

ContainsValue method, 485

GetEnumerator method, 485, 492, 735

Remove method, 578

properties

Count property, 484

indexer property, 483-484

Keys property, 484

Values property, 484

System.Collections namespace, 474, 483

using IDictionaryEnumerator interface, 492

HasPrerequisites method

Course class, 569

Height property

Button class, 708

Form class, 688

ListBox class, 705, 707

Helm, Richard, 297

helper classes, 426

hierarchies, 58

classes, 178

subtrees, 58

housekeeping methods

MainForm class, 757