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• Why System.Web.UI.WebControls.HyperLink doesn't inherit System.Web.UI.ITextControl?

  - by abatishchev

  Why System.Web.UI.WebControls.HyperLink doesn't inherit System.Web.UI.ITextControl? But System.Web.UI.WebControls.Label, System.Web.UI.WebControls.Literal, System.Web.UI.LiteralControl, etc -- does? How can it be?

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• Why exactly should I not call free() on variables not allocated by malloc()?

  - by ultrajohn

  I read somewhere that it is disastrous to use free to get rid of an object not created by calling malloc, is this true? why?

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• Why do the following two queries fail to find the printer makers?

  - by ovr

  In this schema, why do the following two queries fail to find the printer makers? select distinct maker from product where model in (select model from printer) and this: select distinct maker from product, printer where product.model = printer.model

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• Why do different versions of Silverlight assemblies have the same version number?

  - by Simon

  Why do different versions of Silverlight assemblies have the same version number? Location: ...\Silverlight\v3.0\System.Core.dll Name: System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e Location: ...\Silverlight\v4.0\System.Core.dll Name: System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e Location: ...\Silverlight\v4.0\Profile\WindowsPhone\System.Core.dll Name: System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e While standard .net has different version numbers Location: ...\Framework\v4.0.30319\System.dll Name: System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 Location: ...\Framework\v2.0.50727\System.dll Name: System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

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• Why do exceptions usually have the suffix 'Exception' in the class name?

  - by Pheter

  It seems to me that it is rendundant information as the usage of the class will make it apparent that it is an exception. Furthermore, in PHP, the class must extend the Exception class so it will be apparent that it is an exception when looking at the class on its own. Despite this, developers usually apply the suffix 'Exception'. Why is this?

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• why multipart/x-mixed-replace is needed for Comet?

  - by Morgan Cheng

  I'm reading this article about Comet http://en.wikipedia.org/wiki/Comet_(programming). It mentions that browser should support multipart/x-mixed-replace to make XmlHttpRequest Streaming possible. Why this multipart/x-mixed-replace is necessary? Without this header, HTTP response can still be chunked and sent piece by piece to browser, right?

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• Why is the Objective-C Boolean data type defined as a signed char?

  - by EddieCatflap

  Something that has piqued my interest is Objective-C's BOOL type definition. Why is it defined as a signed char (which could cause unexpected behaviour if a value greater than 1 byte in length is assigned to it) rather than as an int, as C does (much less margin for error: a zero value is false, a non-zero value is true)? The only reason I can think of is the Objective-C designers micro-optimising storage because the char will use less memory than the int. Please can someone enlighten me?

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• Why do most web hosting services support only php as server-side language?

  - by HJ-INCPP

  Hello, I have been working with java and python, so I found a nice web host which has support for these. But my question is, why can you find so hard such hosts? I understand that php is easy, I also understand that oracle host is hard to find ($$$ of course), but what do they have against some good open-source, completely free java spring, jsp, django, python, ror, perl etc etc .... So rare to find hosts ... not to mention freelancer bids Thank you.

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• Why can one null return be tested but another throws an exception?

  - by mickey

  I want to test if an xml attribute is present. Given this: XmlAttributeCollection PG_attrColl = SomeNodeorAnother.Attributes; This first test works: if (null != PG_attrColl["SomeAttribute"]) "GetNamedItem" is supposed to return null, but the following test throws an exception complaining about the null it returns. if (null != PG_attrColl.GetNamedItem("SomeAttribute").Value;) Why the difference? Just curious.

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• Why is the first four bytes of Java class file format is CAFEBABE?

  - by zengr

  Why is the first four bytes of Java class file format is CAFEBABE? Who named it? Your views/guesses? Source: IBM Java Programing Dynamics

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• Inheritance from static classes? why not?

  - by Sorush Rabiee

  Hi Why inheritance is not provided for static classes in C#? I know C# has a good reason for everything he implements or doesn't implement. I just wondered, what’s that “good reason” here? semantically, what would be happened if I was able to write a static class that inheritances from another static one? is this an ODD issue? or just programming?

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• Why can't the server get the client MAC address, like the client IP?

  - by stacker

  I know that all MAC addresses that the pocket goes through are in the pocket. This is because that each pocket that goes, should also be returned. So, if the router of the server know about the mac address of the client (all of them), why the server page (like aspx) cannot have this information? Please, give an explanation. (don't just tell me that I'm wrong).

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• Why do all of these methods of accessing an array work?

  - by bstullkid

  It seems to me that some of these should fail, but they all output what they are supposed to: $, = "\n"; %test = ( "one" => ["one_0", "one_1"], "two" => ["two_0", "two_1"] ); print @{$test{"one"}}[0], @{$test{"one"}}->[0], $test{"two"}->[0], $test{"one"}[1]; Why is this?

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• Why does Eclipse crash with Xmx, XX:MaxPermSize above certain values?

  - by alex

  Running Eclipse 3.5.1, JDK 1.6.0_17 on WinXP SP3 32Bit with 3.5 gigs of RAM. I'm aware of the known Eclipse best practices, still trying to figure out eclipse.ini. This will launch: -Xmx588m and this won't: -Xmx589m. Same with -XX:MaxPermSize. Anything above -XX:MaxPermSize=140m won't launch. The screen of death is simlar to this (taken from here). Any ideas on why might this be happening?

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• Why are my two date fields not identical when I copy them?

  - by Hobhouse

  I use django, and have two models with a models.DateTimeField(). Sometimes I need a copy of a date - but look at this: >>>myobject.date = datetime.datetime.now() >>>print myobject.date >>>2010-04-27 12:10:43.526277 >>>other_object.date_copy = myobject.date >>>print other_object.date_copy >>>2010-04-27 12:10:43 Why are these two dates not identical, and how do I make an excact copy of myobject.date?

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• Why is "This program cannot be run in DOS mode" text present in .dll files?

  - by sharptooth

  Recently I opened a .dll file produced by Visual Studio 9 while compiling a native C++ DLL project and was surprised to see the "This program cannot be run in DOS mode" text near the beginning. Why have this text in .dll files?

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• Why I am not able to see recorded video in app's photogallery?

  - by user291247

  Hello, I have recorded video in kitchensink(phone >> save to gallery from video). After recording video it was give message "Check your photo gallery", but when I have open photo gallery(phone photo gallery) recorded video was not there.I am not getting why this was happened.Can any body help me?

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• Why does my simple hello world console app use so much memory?

  - by CodingThunder

  Looking in Process Explorer it uses; Virtual Size: 550,000k , Working Set: 28000k Why does my simple hello world console app use so much memory? I take it the difference between the Working Set and Virtual Size means that difference will be paged to disk? /I am running 64 bit XP. Thanks class Program { static void Main(string[] args) { Console.WriteLine("Hello world"); Console.ReadLine(); } }

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• Why use a Package Installer with your Macintosh App?

  - by Armentage

  Why is it that some Mac Apps are perfectly happy to be simply copied into the /Applications folder, and others require installation-wizard software? Are there advantages to the wizards?

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• why IEEE floating point number calculate exponent using a biased form?

  - by lenatis

  let's say, for the float type in c, according to the IEEE floating point specification, there are 8-bit used for the fraction filed, and it is calculated as first taken these 8-bit and translated it into an unsigned number, and then minus the BIASE, which is 2^7 - 1 = 127, and the result is an exponent ranges from -127 to 128, inclusive. But why can't we just treat these 8-bit pattern as a signed number, since the resulting range is [-128,127], which is almost the same as the previous one.

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• Performance difference in simulator and device in my game. Why ?

  - by srikanth rongali

  Hi, I am writing a small shooting game using cocos2d. It's working good in simulator. But when testing in the device, the animations of sprites are slow and they are stucking. The images I used are CCSprites. And I used CCAnimation for the animation of the images. Why the game acting different in simulator and device ? Thank you.

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• have to invoke (Thread.__init__) in my overridden constructor, but why?

  - by sia

  i saw this phrase in python 2.6 man: class threading.Thread(group=None, target=None, name=None, args=(), kwargs={}) . . . If the subclass overrides the constructor, it must make sure to invoke the base class constructor (Thread.__init__()) before doing anything else to the thread. i just wanna know why?

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• Why do some asp.net controls keep its state although its EnableViewState property is false?

  - by Ahmet Altun

  Put a textbox, a checkbox and a button on a website. Set the "EnableViewState" property of textbox and checkbox to false. Write something into textbox and check the checkbox. Click the button. Why is the textbox still written and the checkbox checked after response?

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• Why does Rails take 15+ seconds to load on Ruby 1.9?

  - by Logan Koester

  On Ruby 1.8.7 a fresh Rails 2.3.5 environment loads in 4.325 seconds, but on Ruby 1.9.1p378 it takes 15.701s - does anyone have any ideas why? This is on a 32-bit single core laptop running Ubuntu.

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• Why is undefined behavior allowed (as opposed to not compiling/crashing)?

  - by Roman A. Taycher

  I understand the reasons for compiler/interpreter language extensions but why is behaviour that has no valid definition allowed to fail silently/do weird things rather then throwing a compiler error? Is it because of the extra difficulty(impossible or simply time consuming) for the compiler to catch them)?

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