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• Why can't I use resources as ErrorMessage with DataAnnotations? C# ASP.NET MVC2

  - by Jova

  Why can't I do like this? [Required(ErrorMessage = "*")] [RegularExpression("^[a-zA-Z0-9_]*$", ErrorMessage = Resources.RegistrationModel.UsernameError)] public string Username { get; set; } What is the error message telling me? An attribute argument must be a constant expression , typeof expression or array creation expression of an attribute parameter type.

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• C: Why some string.h algorithms work slower than simple hand-made ones?

  - by MInner

  For example, strlen() takes about 3*O(n). Why 3? I've wrote a really simple strlen-like function - it works much faster. int string_len(char s[],int &l) { for(l=0;s[l];l++); return l; } Well, some of my friends says, nearly all of string.h algorithms are slower than they should be.

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• Why do I need to commit ignores under TortoiseSVN?

  - by James McMahon

  When I select ignore on a files under version control it marks the parent directory as changes, then when I then do a commit, it checks in svn:ignore property to the repository, resulting in another revision. Why do I need to commit the svn:ignore property? Is this a TortoiseSVN issue or just the way SVN works?

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• Why writing writing to unconnected socket sends SIGPIPE first?

  - by Lukasz Lew

  There are so many possible errors in POSIX environement. Why some of them (write to unconnected socket in particular) get special treatment in form of signals?

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• Why does the definition of MyAnnotation need Documented, Inherited, Retention & RetentionPolicy?

  - by cafe

  What is the purpose of these java.lang.annotation imports in this code? Why are they needed to define MyAnnotation? import java.lang.annotation.Documented; import java.lang.annotation.Inherited; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; @Documented @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface MyAnnotation { String value() default ""; }

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• Why does Linq to Entities generate Left Outer Joins?

  - by DJCasey

  I was wondering if anyone knew why linq to entities always seems to generate left outer joins. I would understand it on an optional relationship but it doesn't make good sense when the relationship is mandatory. Does anyone have any idea how to make it generate inner joins instead?

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• Why do so many wpf controls implement CLR properties instead of dependency properties ?

  - by msfanboy

  Hello, is it because the controls programmers are lazy, too hard to implement or not knowledgeable? Wether they are custom controls from 3rd party vendors or Microsoft itself, very much controls have often clr properties instead of DP. Result is I can not bind to them and is wpf not all about binding? :/ My next side question would be, why do so many wpf controls offer visual parts but they are not member of the visual tree ? see wpf datagrid columns, headers... What do you think?

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• Buttons IBAction doesn't work inside MKAnnotation view, why ??? Any Idea ??

  - by user128647

  I am having MKAnnotationView and i have added UIButton to it, by addSubView method with IBAction assigned to it using addTarget method. But when i tabbed on that button IBAction doesn't called ....! I am not getting, Why it is not working? How can i add button to MKannotationView so that its IBAction called ??? Plz. help me. Thanks

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• Why firefox shows <object> and internet explorer shows <iframe> ?

  - by metal-gear-solid

  Why if i use <object> in place for <iframe>, but IE shows <iframe> in rendered source.

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• If the size of the (accessible) RAM is limited, why isn't the hard disk?

  - by sub

  When the number of possible RAM adresses is limited by the computer architecture (32/64 bit), why isn't the size of the hard disk limited? Or is it limited? If yes, what would be the highest possible size of a hard-disk for a 32-bit computer? How are the adresses of hard-disks handled then?

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• why don't STL ifstream and ofstream classes take std::string as filenames?

  - by vy32

  This is a complaint about STL. Why do they take filename arguments as (char *) and not as std::string? This seems to make no sense. There are two other questions on this topic: How to open unicode filenames with STL Windows Codepage interactions with C++ But seriously, this makes no sense. Are there any plans to upgrade STL?

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• Why didn't C have a boolean data type prior to C99?

  - by frou

  I realise you can just #define some integers, but why didn't C have a dedicated boolean data type before C99? It's such a common occurence in programming and logic, I don't understand the absense of an explicit type and notation.

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• Why doesn't Oracle SQL allow us to use column aliases in GROUP BY clauses?

  - by Mehper C. Palavuzlar

  This is a situation I'm generally facing while writing SQL queries. I think that writing the whole column (e.g. long case expressions, sum functions with long parameters) instead of aliases in GROUP BY expressions makes the query longer and less readable. Why doesn't Oracle SQL allow us to use the column aliases in GROUP BY clause? There must be an important reason behind it.

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• What is the best programming language for web development and why?

  - by Logan Serman

  I've always used PHP, but recently I've been reading about why it's bad. I love Python, but I don't know how it works with the web. I've never even seen Ruby... what is worth learning? Should I stick to PHP?

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• mixing OpenGL and Interface Builder/ UI Controls - bad idea? Why? (iPhone)

  - by Adam

  I've heard that OpenGL ES and standard iPhone UI controls don't play well together, but I'm wondering if anyone knows why, and what the effects are? I'm writing an OpenGL based game, and the view is loaded from a nib file with ui controls, and it seems to work ok, but the game is really simple at this point... does using ui controls cause some kind of performance hit?

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• If Visual Studio 2010 based on WPF, why I cannot open it with reflector?

  - by Mendy

  If Visual Studio 2010 based on WPF, why I cannot open it with reflector? In other words, devenv.exe seems to be native assembly, so where is the WPF UI code?

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• why null pointer exception is not declared as checked exception?

  - by giri

  Hi This was the question asked in interview, null pointer exception is very common why it is not declared as checked exception.I googled but did not get proper answer. Thanks

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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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• Visual Studio C#: Why is a "using" directive insufficient for some libraries?

  - by JYelton

  Scenario: I needed to add HttpUtility to my project, and I started by adding "using System.Web" to my collection of using directives. However the HttpUtility class would still not resolve, and I discovered (via this question) that I needed to add a reference to my project. Question: Why do I need to add a reference to this library when for most other classes a "using" directive will suffice?

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• In jquery 1.4 and 1.3, loading just the framework definition causes an error, why?

  - by codeninja

  Whenever I load ONLY the 1.3 or 1.4 library on an html page im developing on my desktop I get an error that says "setting a property that only has a getter" I dont have any additonal code, this is coming straight from the jquery.min.js file I also get a bazillion warnings in Firebug. Can someone help me resolve this issue? I can't determine why this is happening

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• Why is a c++ reference considered safer than a pointer?

  - by anand.arumug

  When the c++ compiler generates very similar assembler code for a reference and pointer, why is using references preferred (and considered safer) compared to pointers? I did see Difference between pointer variable and reference variable in C++ which discusses the differences between them. EDIT-1: I was looking at the assembler code generated by g++ for this small program: int main(int argc, char* argv[]) { int a; int &ra = a; int *pa = &a; }

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• Why is there no way to do introspection in Objective C with Objects?

  - by user346741

  I have seen examples (on here especially) of calling hideous C functions and getting structures back that have to be iterated, replete with reams of underbars. Why can't I do this (pseudo to follow): Money *cost = [[Money alloc] init]; for (Property *property in [[cost class] properties]){ .. } for (Method *method in [[cost class] methods]){ .. } ?

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• Why is there a "Conversion Errors" tables in an MDB?

  - by Craig Johnston

  Why would there be a "Conversion Errors" table in an MDB? Does this mean there was an attempt to convert the MDB to a different (newer) version of Access?

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• What is an MQ and why do I want to use it?

  - by daveslab

  Hi folks, On my team at work, we use the IBM MQ technology a lot for cross-application communication. I've seen lately on Hacker News and other places about other MQ technologies like RabbitMQ. I have a basic understanding of what it is (a commonly checked area to put and get messages), but what I want to know what exactly is it good at? How will I know where I want to use it and when? Why not just stick with more rudimentary forms of interprocess messaging?

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• Why does checking a wrong password takes longer than checking the right one on Linux?

  - by Flávio Amieiro

  This question has always troubled me. On Linux, when asked for a password, if your input is the correct one, it checks right away, with almost no delay. But, on the other hand, if you type the wrong password, it takes longer to check. Why is that? I observed this in all Linux distributions I've ever tried.

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