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database connection pool example, 127
implementing the pool, 127
DBConnectionSingleton class, 132
ObjectPool class, 128
using the database connection pool, 134
why use a singleton?, 134
DataImport example, 217
classes used, 217
code, 218
logical errors, 223
testing the application, 222
DataSet class, System.Data namespace
ReadXml method, 221
deadlocks, 116
detecting, 116
example, 117
Debug class, System.Diagnostics namespace, 202, 216
Debug statements
stripping from application, 212
debugger
see Visual Studio .NET debugger
debugging, 193, 195
.NET classes, 193
ASP applications, 193
creating application code, 194
Decrement method, Interlocked class, 113
synchronization support, 86
DefaultTraceListener class, System.Diagnostics namespace, 206
delegates
asynchronous calls, 239
designing threaded applications, 143
considerations, 144
tasks requiring separate threads, 144
destroying threads, 65
Destroying example, 65
Disabled option, SynchronizationOption enumeration, 90
Dns class, System.Net namespace, 229, 237
resolving host names into IP address, 237
DoCallBack method, AppDomain class, 27
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