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• Why does NSFetchedResultsController not conform to the UITableViewDataSource protocol?

  - by mystify

  First I thought I've grocked that thing: It's the data source for a UITableView. But then: It does not conform to that data source protocol. Strange! Why? How can it not?

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• (Database Design) why in the database tables most of the times primery key name is: <tablename_id> a

  - by meyosef

  Hi, why in the database tables most of the times primery key name is: tablename_id and not id? example: user_id and not just id. Thanks

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• Why does Firefox allow images to be dragged but not dropped?

  - by LittleBoy

  If you browse a web page through Firefox, any image on the page can be dragged anywhere on the screen—but you can't drop it. Other browsers such as IE or Chrome do not allow dragging images. Is this a issue? Why does Firefox allow dragging?

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• Why use the INCLUDE clause when creating an index?

  - by Cory

  While studying for the 70-433 exam I noticed you can create a covering index in one of the following two ways. CREATE INDEX idx1 ON MyTable (Col1, Col2, Col3) -- OR -- CREATE INDEX idx1 ON MyTable (Col1) INCLUDE (Col2, Col3) The INCLUDE clause is new to me. Why would you use it and what guidelines would you suggest in determining whether to create a covering index with or without the INCLUDE clause?

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• Why @font-face font not looks smooth in FF 3.6 but in IE7?

  - by metal-gear-solid

  Why @font-face font not looks smooth in FF 3.6 but in IE7? see this in IE7 , it will look smooth but in FF 3.6 font will look jaaaged. http://nettuts.s3.amazonaws.com/569_fontface/fontface/index.html

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• Why some websites are not centered but left hand side oriented?

  - by user183089

  I know this may be a stupid question.............. why some website are completely floating on the left hand side of the screen? like http://www.itv.com/ and not centered? thanks

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• Why do some .NET Framework classes not use Generics when they could?

  - by Chris Dwyer

  Example: System.Web.Security.MembershipCollection implements IEnumerable and not IEnumberable<T>. Why doesn't it implement the latter, when it seems that it would be better (e.g. use LINQ)? Or, is it not necessarily better?

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• Why does the destructor of the class called twice ?

  - by dicaprio

  Apologies if the question sounds silly, I was following experts in SO and trying some examples myself, and this is one of them. I did try the search option but didn't find an answer for this kind. class A { public: A(){cout t; t.push_back(A()); // After this line , when the scope of the object is lost. } Why does the destructor of the class called twice ?

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• Can C++ be compiled into platform independent code? Why Not?

  - by rjoshi

  Is it possible to compile C++ program into some intermediate stage (similar to bytecode in java) where the output is platform independent and than later compile/link at runtime to run in native (platform dependent) code? If answer is no, why?

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• Why SelectedIndexChanged fires for a dropdownlist when a button is clicked?

  - by Tony_Henrich

  I have an ASP.NET DropDownList with autopostback=true and enableviewstate = false. I have a button on the page that does nothing. If I change the selection in the ddl, it posts back , which is expected. If I click the button, the page posts back and the ddl's SelectedIndexChanged fires. Why does it get fired?

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• Why is $ undefined when I try to use jQuery in GreaseMonkey?

  - by Natrium

  I'm totally new to GreaseMonkey, but I'm trying to make a little script. // ==UserScript== // @require http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js // ==/UserScript== (function() { $ = unsafeWindow.jQuery; alert($); // this gives 'undefined' }()); Why does the alert give undefined and how to fix this?

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• jQuery - Why is "live" inefficient? And how can we measure that?

  - by ming yeow

  why do programmers say that "live" is inefficient? So what are the alternative methods to replicating that function that are more efficient? How do we measure the impact of how much it slows things down?

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• Why doesn't HashTable.Contains() just simply return false if it is passed a null?

  - by Nate Pinchot

  I understand why passing a null to HashTable.Contains() doesn't work, but I don't understand what the point of it throwing an ArgumentNullException is - instead of just simply returning false? What is the benefit of throwing the exception (other than to make me do null checks before calling .Contains())? Caused By [System.ArgumentNullException] Key cannot be null. Parameter name: key at System.Collections.Hashtable.ContainsKey(Object key) at System.Collections.Hashtable.Contains(Object key)

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• Why is ++i considered an l-value, but i++ is not?

  - by yesraaj

  Why is ++i is l-value? and i++ not Initially there were 2 questions one was removed since that was exact duplicate. So don't down vote the answers that were answering difference between pre- and post-increment.

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• Why can we have static final members but cant have static method in an inner class ?

  - by user275131

  Why can we have static final members but cant have static method in an inner class ? Can we access static final member variables of inner class outside the outer class without instantiating inner class ?

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• How and why are languages formed / Are there any developing languages showing promise?

  - by TheDarkIn1978

  Question 1: How exactly do modern computer language come into being and why? How do they get their start and who is behind them? Question 2: If any, what languages currently in their infancy are showing promise?

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• Why does 'url' not work as a variable here?

  - by kryptobs2000

  I originally had the variable cpanel named url and the code would not return anything. Any idea why? It doesn't seem to be used by anything else, but there's gotta be something I'm overlooking. import urllib2 cpanel = 'http://www.tas-tech.com/cpanel' req = urllib2.Request(cpanel) try: handle = urllib2.urlopen(req) except IOError, e: if hasattr(e, 'code'): if e.code != 401: print 'We got another error' print e.code else: print e.headers print e.headers['www-authenticate']

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• why don't string object refs behave like other object refs?

  - by DayOne

  string a = "a"; string b = a; string a = "c" Why does string b still have the value "a" and not "c"? As string is an object and not a stack value type, what's with this behaviour? Thanks

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• Why does visual studio think js file is a cs file?

  - by divitiae

  I have a ASP.NET solution in Visual Studio 2008 and I added a file identical to http://plugins.jquery.com/files/jquery.cookie.js.txt named jquery.cookie.js in a subfolder of my project containing other javascript files and Visual Studio is treating it as a C# file, giving me errors like CS1012: Too many characters in character literal and Semicolon after method or accesssor block is not valid. Why?

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• Why must I use local path rather than 'svn://' with SVN bindings?

  - by Chad Johnson

  I'm using the Ruby SVN bindings built with SWIG. Here's a little tutorial. When I do this @repository = Svn::Repos.open('/path/to/repository') I can access the repository fine. But when I do this @repository = Svn::Repos.open('svn://localhost/some/path') It fails with /SourceCache/subversion/subversion-35/subversion/subversion/libsvn_subr/io.c:2710: 2: Can't open file 'svn://localhost/format': No such file or directory When I do this from the command line, I do get output svn ls svn://localhost/some/path Any ideas why I can't use the svn:// protocol?

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• why in Windows 7 i see the Data & Time inverse and in Windows XP it fine ?

  - by Gold

  hi why in Windows 7 i see the Data & Time in DataTimePicker inverse and in Windows XP it fine ? (the region and language are same) ex. Win7: 2010/12/31 - 51:09 XP : 31/12/2010 - 09:51 thank's in advance

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• Why is Visual Studio appending "_1" to my website virtual directory?

  - by JC

  I open a solution containing a website project named "Student" in Visual Studio. It adds a virtual directory to IIS named "Student_1" even though there is no virtual directory named "Student". Any idea why Visual Studio is doing this?

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• Why do you need this method inside a Django model ?

  - by alex

  Class mytable(models.Model): abc = ... xyz = ... def __unicode__(self): Why is the "def Unicode" necessary?

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• Why doesn't this simple Ruby program print what I expect it to?

  - by Michael Braxton

  I have this: require 'tempfile' t = Tempfile.new('test-data') t.open t.sync = true t << "apples" t.puts "bananas" puts "contents are [#{t.read}] (#{t.size} bytes)" t.close This prints: contents are [] (14 bytes) Why aren't the contents actually shown? I'm on Ruby 1.9.2.

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• why not a lua implementation of google's protocol buffers? is there already any better solution exis

  - by gray

  why not a lua implementation of google's protocol buffers? is there already any better solution exist for lua?

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