Wednesday, May 18, 2005

Generics Part I - Introduction

Generics or parametric polymorphism allow classes, structs, interfaces, delegates and methods to be parameterized by the type of data they utilize.  It has the following advantages over dynamic approaches:

  • stability

stronger compile time type checking

  • expressivity

invariants expressed in type signatures

  • clarity

fewer explicit conversions between data types

  • efficiency

reduce the need for run-time type checks and boxing operations

Object-based generic design pattern

Without generics, programmers often use the Object-based generic design pattern.  This is a complicated term for something as simple as storing data of any type as an instance of the type Object.  The following List class stores its data in an Object array and the methods Add and the indexer use the Object type to accept and return data:

public class List


      private object[] _items;


      public object this [int index] {...}

      public void Add(object value) {...}


The Object-based generic design applied in the above sample provides the List class with parameter type flexibility.  It is possible to add a value of any type to the List but this solution still has following drawbacks:

  • When the value passed to the Add method is a value type, it is automatically boxed. 
  • When the value returned by the indexer is a value type it must be unboxed with an explicit type cast.  Boxing and unboxing operations add a performance overhead because they involve memory allocations and runtime type checks.
  • When the value returned by the indexer is a reference type, an explicit cast to the appropriate type has to be performed.  This has a performance penalty for the required runtime checking and is quite tedious to write.
  • There is no compile time type checking.  This may cause that problems do not become apparent until the code is executed and an InvalidCastException is thrown.

As you may or may not suspect by now, generics allow us to overcome the abovementioned drawbacks.


What are Generics?

Generics provide class creators the tools to create types that have type parameters.  Rather than forcing conversions to and from Object, instances of generic types accept the types for which they were created and allow us to store the data without any conversions.  The passed type parameter is a placeholder until an actual type is specified during utilization.  The following example uses the parameter TypeOfList as the type for:

  • the internal _items array
  • the parameter type for the Add method
  • the return type for the indexer.

public class List <TypeOfList>


      private TypeOfList[] _items;


      public TypeOfList this [int index] {...}

      public void Add(TypeOfList value){...}



When you want use the generic class List, you must specify the actual type for the type substitute TypeOfList:

List<int> list = new List<int>();


In the constructed type List<int>, every occurrence of the type substitute TypeOfList is replaced with the type argument int.  A constructed type is a generic type that is named with its type parameters.  When an instance of the type List<int> is used in code, the following applies:

  • The native storage for the _items array is int[], this provides an improved storage efficiency compared to the non-generic List. 
  • Generics provide strong typing. This means that at compile time and at runtime it will be verified that only int values or values that can be implicitly cast to an int are used as parameter. 
  • The indexer will return an int value, this eliminates the explicit cast to an int when it is retrieved and thus eliminates the unbox operation.

Generic type declarations may have any number of type parameters.  The following example illustrates its use:

public class Dictionary <TypeOfKey, TypeOfValue>


      public void Add(TypeOfKey key, TypeOfValue value){...}

public TypeOfValue this [TypeOfKey key] {...}




So far the benefits of generics only apply to constructed types.  But when you are coding a generic class, you will find that the type of the parameters is still no more specific than the Object type.  It’s currently impossible to call any type specific method on the parameter values.  To provide us with this information C# permits an optional list of constraints to be supplied for each type parameter.  A type parameter constraint allows you to specify a requirement that a type must fulfill.  Constraints are declared using the word where, followed by:

  • The name of the parameter;
  • a class type (optionally);
  • interface types (optionally);
  • the new() constraint, that allows you to specify the requirement for a public parameterless constructor (optionally).

public class Dictionary <TypeOfKey, TypeOfValue>

where TypeOfKey: IComparable<TypeOfKey>

      where TypeOfValue: IPersistable, new ()


public void Add(TypeOfKey key, TypeOfValue value) {…}



Given the abovementioned declaration, where the type argument for TypeOfKey is constrained to implement IComparable the following applies:

  • the compiler guarantees that any type argument supplied for TypeOfKey implements IComparable;
  • All members of IComparable are directly available on values of the type parameter TypeOfKey.

public void Add (TypeOfKey key, TypeOfValue value)


if (key.CompareTo(value) < 0 {…}



Generic Methods

When you only need a type parameter in a particular method, you will probably want to use a generic method.  A generic method has one or more type parameters specified between < and > delimiters after the method name.  The type parameters can be used within the:

  • parameter list
  • return type
  • body of the method. 

A generic AddDictionary will probably look like this:

public void AddDictionary (Dictionary<TypeOfKey, TypeOfValue> dictionary) {…}


Good news?

Yes, there are least 4 more posts to come on generics: 

  • Generics Part II – Generic Declarations
  • Generics Part III - Advanced Generics;
  • Generics Part IV - Generic Performance and Guidelines;
  • Generics Part V - Generic Implementation or what I make of it.

.NET 2.0
5/18/2005 9:37:04 PM UTC  #  Comments [2] 
Tracked by:
"Party Poker Bonus Codes" (Party Poker Bonus Codes) [Trackback]
"Holdem Tips" (Holdem Tips) [Trackback]
"Blackjack" (Blackjack) [Trackback]
"Free Craps Strategy" (Free Craps Strategy) [Trackback]
"Caribbean Stud" (Caribbean Stud) [Trackback]
"Video Slot Machines Slotto" (Video Slot Machines Slotto) [Trackback]
"How To Win At Casino Roulette" (How To Win At Casino Roulette) [Trackback]
"Best Weight Loss Pill" (Best Weight Loss Pill) [Trackback]
"Debt Consolidation Durham" (Debt Consolidation Durham) [Trackback]
"Hold Em" (Hold Em) [Trackback]
"Online Poker Room" (Online Poker Room) [Trackback]
"Beverly Beach Maryland Slot Machines" (Beverly Beach Maryland Slot Machines) [Trackback]
"colorado refinance home mortgage" (Colorado refinance home mortgage) [Trackback]
"id-1255230-a" (id-1255230-a) [Trackback]
"alcohol amoxicillin can drink taking while" (alcohol amoxicillin can drink taki... [Trackback]
"tramadol quick" (tramadol quick) [Trackback]
"phentermine 37 5mg" (phentermine 37 5mg) [Trackback]
"produits de remplacement de viagra" (produits de remplacement de viagra) [Trackback]
"adderall bladder" (adderall bladder) [Trackback]
"phentermine hcl" (phentermine hcl) [Trackback]
"phentermine 37 5mg" (phentermine 37 5mg) [Trackback]
"buy xanax online" (buy xanax online) [Trackback]
"adderall prescription" (adderall prescription) [Trackback]
"xanax dosage" (xanax dosage) [Trackback]
"neurotin" (neurotin) [Trackback]
"diazepam" (diazepam) [Trackback]
"find cheap phentermine diet pills" (find cheap phentermine diet pills) [Trackback]
"order phentermine" (order phentermine) [Trackback]
"tramadol prescription pharmacy online prices" (tramadol prescription pharmacy o... [Trackback]
"order lortab 10 online no prescription" (order lortab 10 online no prescription... [Trackback]
"oxycontin" (oxycontin) [Trackback] [Trackback]
"oxycontin 40 mg generic" (oxycontin 40 mg generic) [Trackback]
"online xanax" (online xanax) [Trackback]
"buy norco" (buy norco) [Trackback]
"cheap tramadol prescriptions online" (cheap tramadol prescriptions online) [Trackback]
"buy lortab" (buy lortab) [Trackback]
"side effects of seroquel klonopin" (side effects of seroquel klonopin) [Trackback]
"militaires de ritalin" (militaires de ritalin) [Trackback]
"\seroquel and mood stabilization" (\seroquel and mood stabilization) [Trackback]
"cbghkwyzu" (nyibwlufao) [Trackback]
"oxycotin" (oxycotin) [Trackback]
"buy cheap ritalin" (buy cheap ritalin) [Trackback]
"provigil" (provigil) [Trackback]
"buy phentermine" (buy phentermine) [Trackback]
"lipitor side effects" (lipitor side effects) [Trackback]
"Free Blackjack" (Free Blackjack) [Trackback]
"tramadol 100 mg no prescription" (tramadol 100 mg no prescription) [Trackback]
"recommended dosage for amoxicillin" (recommended dosage for amoxicillin) [Trackback]
"side affects of zocor" (side affects of zocor) [Trackback]
"Christian Singles" (Christian Singles) [Trackback]
"Federal Grants" (Federal Grants) [Trackback]
"Grants" (Grants) [Trackback]
"buy cheap phentermine" (buy cheap phentermine) [Trackback]
"Government Grants" (Government Grants) [Trackback]
"Free Money" (Free Money) [Trackback]
"College Grants" (College Grants) [Trackback]
"Credit Counseling Services" (Credit Counseling Services) [Trackback]
"Goverment Grants" (Goverment Grants) [Trackback]
"Free Grants" (Free Grants) [Trackback]
"Pell Grants" (Pell Grants) [Trackback]
"what is the generic name for zovirax" (what is the generic name for zovirax) [Trackback]
"ibuprofen spray" (ibuprofen spray) [Trackback]
"Business Grants" (Business Grants) [Trackback]
"School Grants" (School Grants) [Trackback]
"Educational Grants" (Educational Grants) [Trackback]
"cheap tramadol" (cheap tramadol) [Trackback]
"Education Grants" (Education Grants) [Trackback]
"Student Grants" (Student Grants) [Trackback]
"Foundation Grants" (Foundation Grants) [Trackback]
"Government Loans" (Government Loans) [Trackback]
"Free Government Money" (Free Government Money) [Trackback]
"zocor information" (zocor information) [Trackback]
"cheap phentermine free shipping" (cheap phentermine free shipping) [Trackback]
"phentermine and next day or order by 3" (phentermine and next day or order by 3... [Trackback]
"Web Hosting" (Web Hosting) [Trackback]
"percocet" (percocet) [Trackback] [Trackback]
"lipitor online" (lipitor online) [Trackback]
"extra cheap phentermine" (extra cheap phentermine) [Trackback]
"famvir drug" (famvir drug) [Trackback]
"buy oxycontin oxycodone no r/x" (buy oxycontin oxycodone no r/x) [Trackback]
"tramadol hcl" (tramadol hcl) [Trackback]
"titeaa2b7f1a2" (bn676efe6055) [Trackback]
"Texas Hold'em" (Texas Hold'em) [Trackback]
"video sesso gratis" (video sesso gratis) [Trackback]
"phentermine 37.5 diet pills" (phentermine 37.5 diet pills) [Trackback]
"Free Downloadable Slot Machines" (Free Downloadable Slot Machines) [Trackback]
"Ringtones" (Ringtones) [Trackback]
"Free Ringtones" (Free Ringtones) [Trackback]
"Mp3 Ringtones" (Mp3 Ringtones) [Trackback]
"Free Ringtones" (Free Ringtones) [Trackback]
"Motorola Ringtones" (Motorola Ringtones) [Trackback]
"Norwich Union Travel Insurance" (Norwich Union Travel Insurance) [Trackback]
"phentermine prescription no doctor approval" (phentermine prescription no docto... [Trackback]
"2007 Wsop" (2007 Wsop) [Trackback]
"Rolex Watch" (Rolex Watch) [Trackback]
"Arizona Lottery Numbers" (Arizona Lottery Numbers) [Trackback]
"Rolex Replica" (Rolex Replica) [Trackback]
"Fake Rolex" (Fake Rolex) [Trackback]
"Replica Watches" (Replica Watches) [Trackback]
"racconto sesso" (racconto sesso) [Trackback]
"Kyocera Ringtones" (Kyocera Ringtones ) [Trackback]
gay butt fucking [Trackback]
"Ringtone" (Ringtone ) [Trackback]
blacksonblondes [Trackback]
"Bollywood Ringtones" (Bollywood Ringtones ) [Trackback]
"Razr Ringtones" (Razr Ringtones ) [Trackback]
"Sony Ringtone" (Sony Ringtone ) [Trackback]
interracial mom [Trackback]
"Free Ringtone" (Free Ringtone ) [Trackback]
"Sony Music Box Ringtones" (Sony Music Box Ringtones ) [Trackback]
"home loans" (home loans) [Trackback]
"Cheap Ringtones" (Cheap Ringtones ) [Trackback]
"Free Video Game Ringtones" (Free Video Game Ringtones ) [Trackback]
"Free Crazy Frog Ringtones" (Free Crazy Frog Ringtones ) [Trackback]
"Download Ringtones" (Download Ringtones ) [Trackback]
"Grits And Eggs Ringtones" (Grits And Eggs Ringtones ) [Trackback]
"Free Wwe Ringtones" (Free Wwe Ringtones ) [Trackback]
"Music Ringtones" (Music Ringtones ) [Trackback]
"Free Christian Ringtones" (Free Christian Ringtones ) [Trackback]
"Free Motorola Razr V3 Ringtones" (Free Motorola Razr V3 Ringtones ) [Trackback]
"Arabic Ringtones" (Arabic Ringtones ) [Trackback]
"Download Wav Ringtones" (Download Wav Ringtones ) [Trackback]
"Free South Park Ringtones" (Free South Park Ringtones ) [Trackback]
"Sony Ringtones" (Sony Ringtones ) [Trackback]
"Jamster Ringtones" (Jamster Ringtones ) [Trackback]
milf jackie [Trackback]
"College Fight Song Ringtones" (College Fight Song Ringtones ) [Trackback]
"Free Cellular South Ringtones" (Free Cellular South Ringtones ) [Trackback]
"Free Wav Ringtones" (Free Wav Ringtones ) [Trackback]
"Cricket Ringtones" (Cricket Ringtones ) [Trackback]
post-op transsexuals [Trackback]
"Samsung Ringtones" (Samsung Ringtones ) [Trackback]
"Unicel Ringtones" (Unicel Ringtones ) [Trackback]
rape comix [Trackback]
"Treo 650 Ringtones" (Treo 650 Ringtones ) [Trackback]
"Mobile 17 Ringtones" (Mobile 17 Ringtones ) [Trackback]
"Funny Ringtones" (Funny Ringtones ) [Trackback]
skinny brunette [Trackback]
mardi gras lesson plans [Trackback]
"Verizon Ringtone" (Verizon Ringtone ) [Trackback]
"Crazy Frog Ringtones" (Crazy Frog Ringtones ) [Trackback]
"Free Family Guy Ringtones" (Free Family Guy Ringtones ) [Trackback]
"Free Boost Mobile Ringtones" (Free Boost Mobile Ringtones ) [Trackback]
"Airtel Ringtones" (Airtel Ringtones ) [Trackback]
"Tracfone Ringtone" (Tracfone Ringtone ) [Trackback]
"Anime Ringtones" (Anime Ringtones ) [Trackback]
"Tracfone Ringtones" (Tracfone Ringtones ) [Trackback]
"Buy Ringtones" (Buy Ringtones ) [Trackback]
"free emoticons" (free emoticons) [Trackback]
"Family Guy Ringtones" (Family Guy Ringtones ) [Trackback]
"Free Mp3 Ringtones" (Free Mp3 Ringtones ) [Trackback]
"Wwe Ringtone" (Wwe Ringtone ) [Trackback]
"Vzw Ringtones" (Vzw Ringtones ) [Trackback]
free hairy pics [Trackback]
"Final Fantasy 7 Ringtones" (Final Fantasy 7 Ringtones ) [Trackback]
"Nextel Ringtone" (Nextel Ringtone ) [Trackback]
"Polyphonic Ringtones" (Polyphonic Ringtones ) [Trackback]
"Free Ringtones 3gforfree" (Free Ringtones 3gforfree ) [Trackback]
little girl rape [Trackback]
latina pornstars [Trackback]
pictures of bald eagles [Trackback]
belly pregnant [Trackback]
gangbang rape [Trackback]
teen group sex [Trackback]
"wife rape stories" (wife rape stories) [Trackback]
milf hunter galleries [Trackback]
extreme throat gaggers [Trackback]
faye valentine hentai [Trackback]
toilet bowl cam [Trackback]
free6 chat [Trackback]
amateur teen sex [Trackback]
teen cumshots [Trackback]
big tit lesbians [Trackback]
"tramadol" (tramadol) [Trackback]
cums [Trackback]
animal vagina [Trackback]
free amateur sex video [Trackback]
non-nude, upskirt [Trackback]
sex impotence [Trackback]
adult sheer lingerie [Trackback]
breast implants before after [Trackback]
pleasantly plump lingerie [Trackback]
armpit hair galleries [Trackback]
amatuer straight guys [Trackback]
password southern charms [Trackback]
jenna jameson anal [Trackback]
facials blowjob [Trackback]
gay male bondage [Trackback]
sexy crotchless lingerie [Trackback]
asian wife [Trackback]
animal puppets [Trackback]
grandma incest [Trackback]
phat azz gallery [Trackback]
suck tits [Trackback]
japanese shemale [Trackback]
women squirting orgasms [Trackback]
"gang rape stories" (gang rape stories) [Trackback]
latina cum [Trackback]
dailybasis porn [Trackback]
huge cunt [Trackback]
brutal breast torture [Trackback]
lesbian clit [Trackback]
personal vibrators [Trackback]
crossdressers transvestites [Trackback]
tight pussy huge cock [Trackback]
free shemale movie clips [Trackback]
son fucking mother [Trackback]
hot teenage school girls in thong [Trackback]
exhibitionism dare stories [Trackback]
pictures of bald eagles [Trackback]
shaved beavers [Trackback]
redhead interracial [Trackback]
voyeur photo [Trackback]
brazil booty [Trackback]
massive real breasts [Trackback]
tiava voyeur [Trackback]
pregnant facial [Trackback]
underwater voyeur [Trackback]
forced toilet slave [Trackback]
voyeur websites [Trackback]
"tramadol hcl effects" (tramadol hcl effects) [Trackback]
young teen panties [Trackback]
mardi gras flash [Trackback]
huge dildos in pussies [Trackback]
breast pump [Trackback]
young asian [Trackback]
naked secretary amateur [Trackback]
amateurhomevids [Trackback]
mother sucking son [Trackback]
teen gay [Trackback]
gangbang squad [Trackback]
hairy pussies [Trackback]
teen masturbation [Trackback]
milfhunter [Trackback]
public upskirt [Trackback]
inzest [Trackback]
mature phone sex [Trackback]
male armpit hair [Trackback]
blonde babes in lingerie [Trackback]
swedish milf [Trackback]
gigantic dildos [Trackback]
pregnant hentai [Trackback]
raw teen lesbos action [Trackback]
asian women in thongs [Trackback]
"vacanza mare sardegna" (vacanza mare sardegna) [Trackback]
"Sony Music Box Ringtones" (Sony Music Box Ringtones ) [Trackback]
brunette thumbs [Trackback]
virgins first time [Trackback]
"Free Mp3 Ringtones" (Free Mp3 Ringtones ) [Trackback]
bondage fiction [Trackback]
dorm hunks [Trackback]
feet licking [Trackback]
naruto manga thienz [Trackback]
"Cingular Ringtones" (Cingular Ringtones ) [Trackback]
"Create Ringtones" (Create Ringtones ) [Trackback]
"Download Free Motorola Ringtones" (Download Free Motorola Ringtones ) [Trackback]
"Motorola Ringtones" (Motorola Ringtones ) [Trackback]
"Caller Ringtones" (Caller Ringtones ) [Trackback]
"Us Cellular Ringtones" (Us Cellular Ringtones ) [Trackback]
"Download Free Verizon Ringtones" (Download Free Verizon Ringtones ) [Trackback]
female orgy [Trackback]
girl peeing [Trackback]
"difference between viagra and cialis" (difference between viagra and cialis) [Trackback]
massive boobs breasts tits jugs [Trackback]
"handjobs" (handjobs) [Trackback]
"Verizon Ringtones" (Verizon Ringtones ) [Trackback]
"/cheap_car_insurance/index.html" (/cheap_car_insurance/index.html) [Trackback]
carisoprodol 350mg pill [Trackback]
"Free Ringtones" (Free Ringtones ) [Trackback]
"Ringtones" (Ringtones ) [Trackback]
buy uprima [Trackback]
generic cialis [Trackback]
interracial cuckold humiliation [Trackback]
office fuck [Trackback]
teenage breast implants [Trackback]
propecia testimonials [Trackback]
"cialis soft tabs" (cialis soft tabs) [Trackback]
horny mature women [Trackback]
j lo showing her pussy and ass [Trackback]
highschool voyuer [Trackback]
throat yogurt [Trackback]
desperate house wifes [Trackback]
forced fucked [Trackback]
lipator [Trackback]
huge natural tits [Trackback]
trampled [Trackback]
teen japan posing [Trackback]
office sex pictures [Trackback]
hairy porn [Trackback]
toy dog breeds [Trackback]
lesbians fingering each other [Trackback]
singles group travel [Trackback]
buy cipro [Trackback]
twolips teens [Trackback]
rape in high school [Trackback]
oops galleries [Trackback]
asian wives [Trackback]
pregnant with twins [Trackback]
"axpress" (axpress) [Trackback]
interacial porn [Trackback]
street blowjobs [Trackback]
squirting women [Trackback]
violent comix [Trackback]
executive restrooms [Trackback]
young shemales [Trackback]
jessie hentai [Trackback]
average ejaculation times [Trackback]
hairbrush spanking [Trackback]
huge cock shemales [Trackback]
tips on fingering a girl [Trackback]
"immagine natale" (immagine natale) [Trackback]
nude teen boys [Trackback]
flash your breasts [Trackback]
mature incest [Trackback]
bidet toilet [Trackback]
cum gushing pussies [Trackback]
sexy booty [Trackback]
my first lesbian sex [Trackback]
gay wrestle [Trackback]
first time auditions [Trackback]
cute teen girls [Trackback]
lesbion [Trackback]
pee squatting [Trackback]
"insurance" (insurance) [Trackback]
pregnant morph [Trackback]
jock hunks [Trackback]
black bros white hoes [Trackback]
curly brunette [Trackback]
toto toilet [Trackback]
hot anime [Trackback]
chubby bears [Trackback]
"tramadol without a prescription" (tramadol without a prescription) [Trackback]
throat poking [Trackback]
"Ringtones" (Ringtones ) [Trackback]
"Free Ringtones" (Free Ringtones ) [Trackback]
fisting mpeg [Trackback]
upskirt panties [Trackback]
levitra [Trackback]
female nipple torture [Trackback]
"Unicel Ringtones" (Unicel Ringtones ) [Trackback]
"Hindi Ringtones" (Hindi Ringtones ) [Trackback]
"Hifi Ringtones" (Hifi Ringtones ) [Trackback]
"Blackberry Ringtones" (Blackberry Ringtones ) [Trackback]
"Buy Ringtones" (Buy Ringtones ) [Trackback]
"Centennial Wireless Ringtones" (Centennial Wireless Ringtones ) [Trackback]
"Composer Ringtones" (Composer Ringtones ) [Trackback]
"Napster Ringtones" (Napster Ringtones ) [Trackback]
"Bet Ringtones" (Bet Ringtones ) [Trackback]
"South Park Ringtones" (South Park Ringtones ) [Trackback]
"Disney Ringtones" (Disney Ringtones ) [Trackback]
"Airtel Ringtones" (Airtel Ringtones ) [Trackback]
"Ringtones Gratis" (Ringtones Gratis ) [Trackback]
"Real Tones Ringtones" (Real Tones Ringtones ) [Trackback]
"prenotazione albergo" (prenotazione albergo) [Trackback]
"case vacanza affitto" (case vacanza affitto) [Trackback]
"Grits And Eggs Ringtones" (Grits And Eggs Ringtones ) [Trackback]
"Family Guy Ringtones" (Family Guy Ringtones ) [Trackback]
"Ringtones Graphics" (Ringtones Graphics ) [Trackback]
"Bollywood Ringtones" (Bollywood Ringtones ) [Trackback]
"Hip Hop Ringtones" (Hip Hop Ringtones ) [Trackback]
"Country Ringtones" (Country Ringtones ) [Trackback]
"Treo 650 Ringtones" (Treo 650 Ringtones ) [Trackback]
"Verizon Wireless Ringtones" (Verizon Wireless Ringtones ) [Trackback]
"Motorola Ringtones" (Motorola Ringtones ) [Trackback]
"American Idol Ringtones" (American Idol Ringtones ) [Trackback]
"Nokia Ringtones" (Nokia Ringtones ) [Trackback]
"Final Fantasy Ringtones" (Final Fantasy Ringtones ) [Trackback]
"Yahoo Ringtones" (Yahoo Ringtones ) [Trackback]
"Alltel Ringtones" (Alltel Ringtones ) [Trackback]
"Free Polyphonic Ringtones" (Free Polyphonic Ringtones ) [Trackback]
"Cricket Ringtones" (Cricket Ringtones ) [Trackback]
"Free Sprint Phone Ringtones" (Free Sprint Phone Ringtones ) [Trackback]
"Crazy Frog Ringtones" (Crazy Frog Ringtones ) [Trackback]
"Verizon Ringtones" (Verizon Ringtones ) [Trackback]
"Free Nextel Real Music Ringtones" (Free Nextel Real Music Ringtones ) [Trackback]
"Final Fantasy 7 Ringtones" (Final Fantasy 7 Ringtones ) [Trackback]
"Nextel Ringtones" (Nextel Ringtones ) [Trackback]
"Boost Mobile Ringtones" (Boost Mobile Ringtones ) [Trackback]
"Mp3 Ringtones" (Mp3 Ringtones ) [Trackback]
"Caller Ringtones" (Caller Ringtones ) [Trackback]
"Free Downloadable Ringtones" (Free Downloadable Ringtones ) [Trackback]
"Christian Ringtones" (Christian Ringtones ) [Trackback]
animals mating [Trackback]
"Cingular Ringtones" (Cingular Ringtones ) [Trackback]
"Free Cingular Cell Phone Ringtones" (Free Cingular Cell Phone Ringtones ) [Trackback]
"Indian Ringtones" (Indian Ringtones ) [Trackback]
"Download Free Verizon Ringtones" (Download Free Verizon Ringtones ) [Trackback]
"Funny Ringtones" (Funny Ringtones ) [Trackback]
"Cellular One Ringtones" (Cellular One Ringtones ) [Trackback]
"Jamster Ringtones" (Jamster Ringtones ) [Trackback]
"Free Verizon Wireless Lg Ringtones" (Free Verizon Wireless Lg Ringtones ) [Trackback]
"Midi Ringtones" (Midi Ringtones ) [Trackback]
"Vzw Ringtones" (Vzw Ringtones ) [Trackback]
free girls squirting [Trackback]
"3g For Free Ringtones" (3g For Free Ringtones ) [Trackback]
"Free Sprint Pcs Ringtones" (Free Sprint Pcs Ringtones ) [Trackback]
"3g4free Ringtones" (3g4free Ringtones ) [Trackback]
"Us Cellular Ringtones" (Us Cellular Ringtones ) [Trackback]
"Create Ringtones" (Create Ringtones ) [Trackback]
"Kyocera Ringtones" (Kyocera Ringtones ) [Trackback]
"Tracfone Ringtones" (Tracfone Ringtones ) [Trackback]
"Arabic Ringtones" (Arabic Ringtones ) [Trackback]
round azz [Trackback]
"Cheap Ringtones" (Cheap Ringtones ) [Trackback]
"T-mobile Ringtones" (T-mobile Ringtones ) [Trackback]
"Polyphonic Ringtones" (Polyphonic Ringtones ) [Trackback]
hot cowboy hunks [Trackback]
teen bbs [Trackback]
"cheap phentermine" (cheap phentermine) [Trackback]
medieval torture devices [Trackback]
shitters [Trackback]
atk hairy galleries [Trackback]
the free voyeurweb [Trackback]
ah-me [Trackback]
drunk bikini [Trackback]
unshaven natural girls [Trackback]
english to japanese translator [Trackback]
teen gallery [Trackback]
homemade porn [Trackback]
project voyeur uk [Trackback]
fat cartoons [Trackback]
bobco handjob [Trackback]
"phases of hydrocodone withdrawal" (phases of hydrocodone withdrawal) [Trackback]
webcam voyuer [Trackback]
artwork interracial couples [Trackback]
pregnant men [Trackback]
spandex camel toe [Trackback]
tug jobs [Trackback]
teen rape [Trackback]
interracialxxx [Trackback]
oral copulation [Trackback]
card captor hentai [Trackback]
hairy hunks [Trackback]
mardi gras galveston [Trackback]
interracial gay [Trackback]
gay boys in boxers [Trackback]
busty dusty [Trackback]
gorgeous legs [Trackback]
shemalestrokers [Trackback]
amateur gay sex [Trackback]
statin drugs [Trackback]
asslick [Trackback]
homemade ice cream [Trackback]
famous transsexuals [Trackback]
pantyhose secretaries [Trackback]
fisting movie galleries [Trackback]
pregnant women having sex [Trackback]
8th street latinos [Trackback]
buy levitra online [Trackback]
bobco handjob hetero gallery [Trackback]
first interracial [Trackback]
levitra [Trackback]
cum lovers [Trackback]
weeing [Trackback]
"strip webcam" (strip webcam) [Trackback]
big breasted ladies [Trackback]
women flashing truckers [Trackback]
"cheap tramadol" (cheapest tramadol online) [Trackback]
techniques for fingering a girl [Trackback]
is hoodia safe [Trackback]
girl squirting [Trackback]
amateur sluts [Trackback]
hot nude brunettes [Trackback]
bondage stories [Trackback]
spanking clips [Trackback]
teen mpeg [Trackback]
japanese teen sex [Trackback]
trumpet fingering chart [Trackback]
anal squirting [Trackback]
nice breasts [Trackback]
gallons of cum [Trackback]
"Escort incontri." (Annunci sesso incontri inserimento gratuito.)&nbs