U

uint value type, 36, 37, 38

literal, 47

UInt16 .NET structure, 392, 393, 569, 570

UInt32 .NET structure, 392, 393, 569, 570

UInt64 .NET structure, 392, 393, 569, 570

ulong value type, 36, 37

literal, 47

Unboxing, 300–302

unchecked statement, 357–359

#undef directive, 439, 443–444

Unicode, 42, 361, 375

UTF-16 and UTF-32, 583

UnicodeCategory enumeration, 584

Uniform Resource Identifier (URI), 779–780

constructing, 789

dissecting, 790

Uniform Resource Locator (URL), 779

Unmanaged code, 9, 533, 534

UnmanagedMemoryStream class, 363

/unsafe compiler option, 534

unsafe keyword, using, 536

UploadData( ), 801

UploadFile( ), 801

UploadString( ), 801–802

UploadValues( ), 802

Uri class, 780, 789–348

UriFormatException, 781, 787

UseDefaultCredentials property, 782, 799

ushort value type, 36, 37, 38

using

directive, 19, 22, 429–432, 559

statement, 550, 554–555, 819–820