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• How to : required validator based on user role ASP.Net MVC 3

  - by user70909

  Hi, i have a form where i have the field "Real Cost" i want to customize its appearance and wither it should be validated based on user role. to be more clear is say the client want to show his field in the form or details page and also make it editable for users in Roles "Senior Sales, Manager" but not other roles, so can anyone please guide me of the best way ? should i write custom required validation based on user in role, and if so can you please provide the right implementation of it? some may tell me create custom model for this, but i think it would be hassle plus the Roles will be dynamic so it is not predefined set of roles. i hope i was clear enough

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• Open source and salary

  - by darko petreski

  Hi, We are facing a lot of open source software. But someone needs to write that software. How are they payed? Do you know a good article about the open source politics and economy? Sometimes the big companies themselves release open source because they have some benefits. Then they sell support, advices ... My question is what is the real economy about open software? No professional will work for nothing. This software are couple of classes but thousand or may be millions of classes. If you are really a pro you will write software for money, because you have life, wife, kids, taxes, you must earn. Please do not tell me that they are doing this for pleasure or hobby. Regards, Darko Peterski Regards

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• Starting point for learning CAD/CAE file formats?

  - by Escader

  We are developing some stress and strain analysis software at university. Now it's time to move from rectangles and boxes and spheres to some real models. But I still have little idea where to start. In our software we are going to build mesh and then make calculations, but how do I import solid bodies from CAD/CAE software? 1) How CAD/CAE models are organised? How solid bodies are represented? What are the possibilities of DWG, DXF, IGES, STEP formats? There is e.g. a complete DXF reference, but it's too difficult for me to understand without knowing basic concepts. 2) Are there C++ libraries to import solid bodies from CAD/CAE file formats? Won't it be too difficult to build a complete model to be able to import comprehensive file?

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• How to create playable FLV video from part of FLV file using FFMPEG?

  - by Ole Jak

  So we had real FLV video file. we had devided it into 3 parts (more or less equal, not looking into structure orcontext). We have taken second part and forgot about first 2. Video contained audio and video track. mp3 and on vp6. Is it any how possible to play thsat second part after sending to ffmpeg some command? So how to (using any FFMPEG API (in general in any programming language) or using command line) turn bytearray into playable video? (knowing what format video was created in and some other data like used codecs )

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• substitution of someaddress.com on local desktop computer

  - by dev

  Here is VDS server with ip(for example 105.123.123.123) with working apache service. And there is a desktop computer with linux on board(but really I presume there is no difference). I need to type on web browser address like someaddress.com and to see website situated at my server. My /etc/hosts: 127.0.0.1 localhost 105.123.123.123 someaddress.com 105.123.123.123 www.someaddress.com But it doesn't work. I see real someaddress.com website. What can be wrong. It will be great if you help me with that. P.S. Why I need this. There is one project with fixed links(like someaddress.com/inf). And I need to test it.

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• Unit Testing & Fake Repository implementation with cascading CRUD operations

  - by Erik Ashepa

  Hi, i'm having trouble writing integration tests which use a fake repository, For example : Suppose I have a classroom entity, which aggregates students... var classroom = new Classroom(); classroom.Students.Add(new Student("Adam")); _fakeRepository.Save(classroom); _fakeRepostiory.GetAll<Student>().Where((student) => student.Name == "Adam")); // This query will return null... When using my real implementation for repository (NHibernate based), the above code works (because the save operation would cascade to the student added at the previous line), Do you know of any fake repository implementation which support this behaviour? Ideas on how to implement one myself? Or do you have any other suggestions which could help me avoid this issue? Thanks in advance, Erik.

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• EMBED vs. OBJECT

  - by JayhawksFan93

  Which is the right/best tag to use in my HTML file when I want to display the Adobe PDF viewer? Right now I'm using the code below, but there are weird side effects (e.g. it seems to steal the starting focus that I've set to another INPUT text box; it doesn't seem to play real well with the jQueryUI Resizeable class; etc.) <embed src="abc.pdf" type="application/pdf" /> Could I even do the same thing with the OBJECT tag? Are there advantages/disadvantages to using one tag vs. the other?

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• ASP.NET MVC View Engine Comparison

  - by McKAMEY

  EDIT: added a community wiki to begin capturing people's experience with various View Engines. Please respectfully add any experiences you've had. I've been searching on SO & Google for a breakdown of the various View Engines available for ASP.NET MVC, but haven't found much more than simple high-level descriptions of what a view engine is. I'm not necessarily looking for "best" or "fastest" but rather some real world comparisons of advantages / disadvantages of the major players (e.g. the default WebFormViewEngine, MvcContrib View Engines, etc.) for various situations. I think this would be really helpful in determining if switching from the default engine would be advantageous for a given project or development group. Has anyone encountered such a comparison?

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• I'm going to write 'Unit of Work', please help me find out all gimmicks

  - by o..o

  Hi everybody, I'm going to write my own DAL in C#. I decided to use 'Unit of Work' pattern (next mentioned as uow) with request as a scope and Identity map stored in HttpContext.Items. I have right now question about implementing of CRUD methods. How/where are they implemented? Are they implemented in every single business class (as in active records pattern) or are implemented somehow in uow class (if so, how)? I also suppose that I need to use as the scope not just the request, but also the db connection. But how? Should I open the connection a the start of the request and close it on uow disposing? Every advice is strongly appreciated, especially Your "real world" experiences. Thank you all :)

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• EJB3 Business Delegates

  - by mykola

  Is there any reason for making delegate when using EJB3? Because the only real benefit i see from delegate is that it allows to hide lookup and access details of EJB architecture. Well it also provides some decoupling but it's mostly unused, imho. With EJB3 we have injection so now i can just create a variable with @EJB annotation and use it as is. Do i still need delegates? Is this injection resource consuming? I mean if i use it in JSF's request managed beans may be it's still better to use delegates just to lessen these injection calls? Thank you!

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• NetBeans and Eclipse-like "run configurations"

  - by auramo

  Is it possible to create anything similar to Eclipse's "run configurations" in NetBeans? I am working on a huge project which is currently not divided into any subprojects in Eclipse. There are in fact many applications in the project which have their own main-methods and separate classpaths. I know, it's a mess. I'm considering about migrating the project to NetBeans. In the long run it would be sensible to create many projects but for now it would be a real life-saver if I could do similar stuff in NetBeans than in Eclipse: create "launchers" which have their own classpaths. Is this possible? If it's easy to emulate this behaviour with "external" projects, hints about that are welcome as well.

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• PyPy -- How can it possible beat CPython?

  - by Vulcan Eager

  From the Google Open Source Blog: PyPy is a reimplementation of Python in Python, using advanced techniques to try to attain better performance than CPython. Many years of hard work have finally paid off. Our speed results often beat CPython, ranging from being slightly slower, to speedups of up to 2x on real application code, to speedups of up to 10x on small benchmarks. How is this possible? Which Python implementation was used to implement PyPy? CPython? And what are the chances of a PyPyPy or PyPyPyPy beating their score? (On a related note... why would anyone try something like this?)

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• Is there a JS diff library against htmlstring just like google-diff-match-patch on plain text?

  - by Steve

  Currently I am using google-diff-match-patch to implement a real-time editing tool, which can synchronize texts between multiple users. Everything works great when operations are only plain texts, each user's operation(add/delete texts) could be diff-ed out by comparing to old text snapshot with the helper of google-diff. But when rich format texts(like bold/italic) are involved, google-diff not working well when comparing the htmlstring. The occurrence of character of < and > messed up the diff results, especially when bold/italic format are embedded within each other. Could anyone suggest a similar library like google-diff to diff htmlstrings? Or any suggestions can get my problem fixed with google-diff? I understood google-diff is designed for plain text, but really didn't find a better library than it so far, so it also works if a doable enhancement to google-diff can help. Thanks for any comments. Regards, Steve

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• How to implement a Digg-like algorithm?

  - by Niklas

  Hi, How to implement a website with a recommendation system similar to stackoverflow/digg/reddit? I.e., users submit content and the website needs to calculate some sort of "hotness" according to how popular the item is. The flow is as follows: Users submit content Other users view and vote on the content (assume 90% of the users only views content and 10% actively votes up or down on content) New content is continuously submitted How do I implement an algorithm that calculates the "hotness" of a submitted item, preferably in real-time? Are there any best-practices or design patterns? I would assume that the algorithm takes the following into consideration: When an item was submitted When each vote was cast When the item was viewed E.g. an item that gets a constant trickle of votes would stay somewhat "hot" constantly while an item that receives a burst of votes when it is first submitted will jump to the top of the "hotness"-list but then fall down as the votes stop coming in. (I am using a MySQL+PHP but I am interested in general design patterns).

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• In Javascript event handling, why "return false" or "event.preventDefault()" and "stopping the event

  - by Jian Lin

  It is said that when we handle a "click event", returning false or calling event.preventDefault() makes a difference, in which the difference is that preventDefault will only prevent the default event action to occur, i.e. a page redirect on a link click, a form submission, etc. and return false will also stop the event flow. Does that mean, if the click event is registered several times for several actions, using $('#clickme').click(function() { … }) returning false will stop the other handlers from running? I am on a Mac now and so can only use Firefox and Chrome but not IE, which has a different event model, and tested it on FF and Chrome and all 3 handlers ran without any stopping…. so what is the real difference, or, is there a situation where "stopping the event flow" is not desirable? this is related to http://stackoverflow.com/questions/3042036/using-jquerys-animate-if-the-clicked-on-element-is-a-href-a and http://stackoverflow.com/questions/2017755/whats-the-difference-between-e-preventdefault-and-return-false

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• SVN project folder tree structure vs production folder tree structure

  - by Marco Demaio

  While developing a PHP+JS web application we always try to separate big blocks of code into small modules/components, in order to make these last ones as much reusable as possible in other applications. Let's say we now have: the EcommerceApp (an ecommerce main application) a Server-file-mgr component (a component to view/manage file on server) a Mylib (a library of useful functions) a MailistApp (another main application to handle mail lists) ... EcommerceApp needs both Server-file-mgr component and Mylib to work Server-file-mgr needs Mylib to work MaillistApp needs both Server-file-mgr component and Mylib to work too. My idea is to simply structure the SVN project folder tree putting everything at the same level: trunk/EcommerceApp trunk/Server-file-mgr trunk/Mylib trunk/MaillistApp But in real life to make these apps to work the folder tree structure must be the following: EcommerceApp |_ Mylib |_ Server-file-mgr MaillistApp |_ Mylib |_ Server-file-mgr I mean Mylib and Server-file-mgr needs to be inside the EcommerceApp/MaillistApp folder. How would you then structure the SVN folder, as I did or in a different/better/smarter way???

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• SQlite: Column format for unix timestamp; Integer types

  - by SF.

  Original problem: What is the right column format for a unix timestamp? The net is full of confusion: some posts claim SQLite has no unsigned types - either whatsoever, or with exception of the 64bit int type (but there are (counter-)examples that invoke UNSIGNED INTEGER). The data types page mentions it only in a bigint example. It also claims there is a 6-byte integer but doesn't give a name for it. Of course standard INTEGER being 4-byte signed signed stores unix timestamps as negative numbers. I've heard that some systems return 64-bit timestamps too. OTOH I'm not too fond of wasting 4 bytes to store 1 extra bit (top bit of timestamp), and even if I have to pick a bigger data format, I'd rather go for the 6-byte one. I've even seen a post that claims SQLite unix timestamp is of type REAL... Complete problem: Could someone please clarify that mess?

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• Is it worth learning Perl 6?

  - by Andres

  I have the opportunity to take a two day class on Perl 6 with the Rakudo Compiler. I don't want to start a religious war, but is it worth my time? Is there any reason to believe that Perl 6 will be practical in the real world within the next two years? Does anyone currently use it effectively? Update I took the class and learned a lot. However, after day 1, my mind was a bit overwhelmed. There are tons of cool ideas in perl 6, and it will be neat to see what filters up to other languages. Overall the experience was a positive use of my time, though I wasn't able to absorb as much on the second day. If it were a three day class it would have been unproductive just because there is a limit to how much you can process in a short amount of time.

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• Generic Data Structure Description Language

  - by Jon Purdy

  I am wondering whether there exists any declarative language for arbitrarily describing the format and semantics of a data structure, that can be compiled to a specific implementation of that structure in any of a set of target languages. That is, something like a generic data definition language but geared toward describing arbitrary data structures such as vectors, lists, trees, etc., and the semantics of operations on those structures. I ask because I had an idea for a feasible implementation of this concept, and I'm just wondering whether it's worth it, and, consequently, whether it's been done before. Another, slightly more abstract question: is there any real difference between the normative specification of a data structure (what it does) and its implementation (how it does it)?

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• Wrong line number on stack trace

  - by Claudio Redi

  Hi! I have this code try { //AN EXCEPTION IS GENERATED HERE!!! } catch { SqlService.RollbackTransaction(); throw; } Code above is called in this code try { //HERE IS CALLED THE METHOD THAT CONTAINS THE CODE ABOVE } catch (Exception ex) { HandleException(ex); } The exception passed as parameter to the method "HandleException" contains the line number of the "throw" line in the stack trace instead of the real line where the exception was generated. Anyone knows why this could be happening?

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• Loading dynamic content and rewrite URL on Hashchange event with Jquery Mobile

  - by user3611500

  I'm building a mobile version for my website using Jquery Mobile API. The framework provides automate AJAX navigation processing. But as far as i know it require "real" pages for loading purpose. What i want to do is override the automate navigation process of it and process the hashchange on my own. But i can't not rewrite the url using window.hashChange, which is running well on my non-mobile website version : $(function () { $(window).off().hashchange(function () { if (location.hash.length > 1) { PageSelect(); } }); $(window).hashchange(); }); I just only want to take advantage on jquery mobile interfaces, i don't want anything with its automate ajax navigation stuff ! I tried to disable it using ajaxEnabled() but got no luck.

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• EnvDTE: ArgumentException when accessing the ActiveConfiguration

  - by Smith

  Hello, I'm writing an addin for Visual Studio 2008. At some point in my code, I'm attempting to access the current active configuration for a project: var configName = _Project.ConfigurationManager.ActiveConfiguration.ConfigurationName; Sometimes, in some very obscure cases, the getter for ActiveConfiguration throws an ArgumentException. Nothing in the documentation says anything about this (but given the very poor quality of the documentation, it was to be expected), and the exception's message is not helping at all. Also, ConfigurationManager is an interface, and I don't know what's the real implementation behind it, so I can't simply disassemble it in Reflector to know the cause. Any help would be greatly appreciated.

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• Appserver runs out of memory

  - by sarego

  We have been facing Out of Memory errors in our App server for sometime. We see the used heap size increasing gradually until finally it reaches the available heap in size. This happens every 3 weeks after which a server restart is needed to fix this. Upon analysis of the heap dumps we find the problem to be objects used in JSPs. Can JSP objects be the real cause of Appserver memory issues? How do we free up JSP objects (Objects which are being instantiated using usebean or other tags)? We have a clustered Websphere appserver with 2 nodes and an IHS.

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• .NET Code Access Security: Useful or just overcomplicated?

  - by routeNpingme

  see also Is “Code Access Security” of any real world use? I want to get some other opinions on this... I like the idea of Code Access Security for desktop applications. But in the lifetime of .NET I have to admit I've never actually had a situation where CAS has actually blocked something to my benefit. I have, however, had many times where something as simple as sharing a quick .NET application across a mapped drive becomes an enterprise code access nightmare. Having to break out caspol.exe to create trusted path rules and having no clear way of knowing why something failed makes it seem like CAS adds way more frustration to the development and deployment process than it offers in security. I'd like to hear either some situations where CAS has actually helped more than hurt, or if there are other people out there frustrated with its current implementation and defaults.

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• ASP.Net 4.0 on IIS6 vs IIS7

  - by JBeckton

  I am trying to convince my boss to upgrade a couple web app servers from Win 2003 to Win 2008 so I can utilize ASP.Net 4.0 on IIS7. I am also trying to get our SQL Server 2000 upgraded to 2008 so I can use Linq2SQL in VS2010 plus a bunch of other reasons. But the boss is experiencing sticker shock now that I have told him what it all costs. So I guess I have to possibly cut back some where. My question is what are the benefits of ASP.Net 4.0 on IIS7 over ASP.Net 4.0 on IIS6 or are there any real benefits?

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