O

object activation (.NET Remoting)

Activator class for, 1027

for client-activated objects, 1028–1029

messages, 1030

new operator for, 1027

proxy objects and, 1027, 1029

specifying the application URL, 1027

for well-known objects, 1027–1028

Object Browser window (Visual Studio 2005), 397–398

Object class

all .NET classes derived from, 106

as default base class, 113

Equals() method, 107

Finalize() method, 107, 108

GetHashCode() method, 107

GetType() method, 107, 108

MemberwiseClone() method, 107, 108

ToString() method, 106, 108–109

object type, 44–45

object-oriented programming (OOP), 30

OLE DB provider with ADO.NET, 597–600

OnAction method, 189–190

OnContinue() method (QuoteService assembly), 1286

OnCustomCommand() method (QuoteService assembly), 1286

OnDisplayButtonClick event handler, 1195–1196

OnDoubleClick() event handler, 892–893

OnListBoxFilesSelected event handler, 1196

OnListBoxFoldersSelected event handler, 1196

OnMouseDown() method, 892

OnOrderSelectionChanged() method, 1118–1119

OnPaint() method

CapsEditor example, 887–888

clipping region and, 848–850

DisplayImage project, 872

DisplayText example, 874–875

EnumFontFamilies example, 879, 880

painting shapes using, 847–848

scroll bars and, 859–860, 862

ScrollMoreShapes example, 870

OnPause() method (QuoteService assembly), 1286

OnPowerEvent() method (ServiceBase class), 1314

OnSelectCulture() method, 522

OnShutdown() method (QuoteService assembly), 1286

OnStart() method (QuoteService assembly), 1285, 1286, 1287

OnSubmitCourseOrder() method, 1114

OnUpButtonClick event handler, 1197

OOP (object-oriented programming), 30

Open() method (ColdCallFileReader class), 343–344

opening

database connections with ADO.NET, 583

message queues, 1104–1106

projects from previous versions in Visual Studio 2005, 374–376

OpenRead() method (WebClient class), 1240–1241

OpenSubKey() method (RegistryKey class), 1230

OpenWrite() method (WebClient class), 1241

operating systems supported by .NET, 553

operators. See also specific operators

as, 138

assignment versus comparison, 48, 134–135

checked and unchecked, 137

comparison, 48, 134–135, 147

compiler and, 149–150

defined, 86

is, 138

null coalescing, 139–140

nullable types and, 139

overloading, 148–157

pointer member access operator, 212

for pointers, 207

precedence, 140

for removing method calls from multicast delegates, 183

shortcut assignment operators, 135–136

sizeof, 138

table summarizing, 134

ternary, 136–137

typeof, 139

unsafe, 134

Order class, 1081–1083

OrderControl component, 1080–1081, 1084–1085, 1091–1092

OrderData component, 1081, 1085–1088, 1092–1093

OrderLine class, 1083–1084

OrderLineData component, 1081, 1088–1089

/out option for compiler output file specification, 64

out parameters

anonymous methods and, 177

passing to methods, 91

outsourcing translations, 543–544

OverflowException class, 329

overloading constructors, 95

overloading methods

DrawEllipse() method, 845

DrawRectangle() method, 845

overview, 92

Run() method, 753

Write() method, 1216–1217

overloading operators

arithmetic operators, 148, 151–152, 153–155

comparison operators, 148, 155–157

compiler and, 149–150

for concatenating strings, 224

operators supporting overloading, 157

public and static declaration required for, 152

uses for, 148, 149

Vector struct example, 150–157

override modifier, 125

overriding

Equals method for comparisons, 146–147, 148

Equals method for dictionaries, 264, 266, 267

GetHashCode() method for dictionaries, 263–264, 266–267

OnPaint() method, scrolling windows and, 859–860, 862

Render() method for custom control, 954–955

virtual methods and properties, 114–115