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• Breaking changes in .NET 4.0

  - by Andrei Taptunov

  There is a lot of information about new features and classes in new 4.0 however there are also changes that may affect esixting applications, for example Timespan now implements IFormattable and old string.Format() with invalid options will throw exception instead of calling simple ToString(). However, CLR team provides a nice feature to enable behaviour from previous version with configuration setting - TimeSpan_LegacyFormatMode . CLR Inside Out Access to events inside the class where they are declared using += or -= will lead to call add/remove generated accessors that return void. Some code wan't even compile in 4.0. Chris Burrows Blog CAS is deprecated and to enable it one still need to use special setting in configuration - NetFx40_LegacySecurityPolicy So I wonder what are other changes and is it possible to find at least preliminary list of changes that will or may break existing functionality with release of .NET 4.0 ?

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• How is GroupOn website programmed?

  - by Maxi Garcia

  Hello world! This is my first time on Stackoverflow.com and it's great to be here! I need some expert programmer out there to tell me how the GroupOn's platform operates, from the programming point of view. Which are the most complex features it has and what technology do they use? If I were about to start learning programming languages, what should I learn to create a site like GroupOn.com? Is there any website where I can learn the basic principles for free? I appreciate your advices. Thanks in advance!

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• Most user-friendly issue tracker?

  - by Kugel

  Sorry if this has been asked before, couldn't find anything specific. I'm looking for the most user-friendly issue tracker. Currently I'm using Trac. I'm looking for these 2 features: Very easy to create new ticket Email to ticket conversion (with attachements). The customers should be glad to use it (not avoid it like Trac). More often than not I get e-mails as bug reports and putting them into Trac wastes my time. I would really love to just hit forward and the ticket would appear in the issue tracker.

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• image analysis question for matlab

  - by raekwon

  Hi, I asked a similar question but wasn't quite clear before. I am trying to put a blue or an orange or some other colored circle (more like a donut) around a feature in an image so that I can track it. It should be more like a donut so that I can still view the image... Anyway, I have a multidimensional array and then extract 2D submatrices out of it and plot each one using imagesc(subarray). For all the subarrays there are multiple features that I've located and want to track. Is it possible in Matlab to put a donut/circle around them to do that? How would you do that?

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• Bind list from FormView to model in ASP.net webforms

  - by Monty

  For a large fillin form I use the asp.net FormView for the magic databinding to my model. In this model I've a property called Rides (shown below), which exposes a list, which I obviously not want to be replaced entirely. So I made it readonly. However, this way I can't use the databinding features anymore. Is there a common solution for this problem? public IList<Ride> Rides { get { if (this._rides == null) { this._rides = new List<Ride>(); } return this._rides; } }

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• Simpler Linq to XML queries with the DLR

  - by Xavier

  Hi folks, I have a question regarding Linq to XML queries and how we could possibly make them more readable using the new dynamic keyword. At the moment I am writing things like: var result = from p in xdoc.Elements("product") where p.Attribute("type").Value == "Services" select new { ... } What I would like to write is something like: var result = from p in xdoc.Products where p.Type == "Services" select new { ... } I know I can do this with Linq to XSD which is pretty good already, but obviously this requires an XSD schema and I don't always have one. I am sure there should be a way to achieve this using the new dynamic features of .NET 4.0 but I'm not sure how or if anyone already had a go at this. Obviously I would loose some of the advantages of Linq to XSD (typed members and compile time checks) but it wouldn't be worse than the original solution and would certainly be more readable. Anyone has an idea? Thanks

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• F# performance in scientific computing

  - by aaa

  hello. I am curious as to how F# performance compares to C++ performance? I asked a similar question with regards to Java, and the impression I got was that Java is not suitable for heavy numbercrunching. I have read that F# is supposed to be more scalable and more performant, but how is this real-world performance compares to C++? specific questions about current implementation are: How well does it do floating-point? Does it allow vector instructions how friendly is it towards optimizing compilers? How big a memory foot print does it have? Does it allow fine-grained control over memory locality? does it have capacity for distributed memory processors, for example Cray? what features does it have that may be of interest to computational science where heavy number processing is involved? Are there actual scientific computing implementations that use it? Thanks

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• Django and App Engine

  - by notnoop

  I wanted to check the status of running Django on the Google App Engine currently and what the benefits of running django on GAE over simply using Webapp. Django main killer feature, IMHO, is the reuseable apps and middleware. Unfortunately, most current Django apps use models or model forms (django-tags, django-reviews, django-profiles, Pinax apps). So what are the remaining features or benefits that django has that can still run in Google App Engine (other than what's disabled: the popular django apps, session and authentication middleware, users and admin, models, etc). Also, is there a list of the Django apps that work in App Engine as well?

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• Prevent Character Escape When Calling XmlWriter.WriteElementString

  - by Ibrar Afzal

  I have a string <entry key="Provider">Comcast Cable Communications, Inc.</entry> <entry key="Challenged">No</entry> I need to call the using xmlwriter.WriteElementString I need to what the string mentioned earlier. Problem here is the xwriter.WriteElementString will escape all "<" and "" symbols with &lt and &gt. I have checked MSDN to see if there is a way to disable it, but have not found an answer. Is there a way to disable the auto-escape features?

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• silverlight 3.0 communication with winforms

  - by abusemind

  I would like to create a winform on the client side for interaction with Silverlight 3.0. The basic idea is using the winform browser. I definitely need both the directions of communication. Would it be impossible by using JavaScript as a midware for the interaction or some better ways? Or is there any new features of Silverlight 3.0 supported for this kind of winform application communication? The original one is one the client's browser to run but now I would like to migrate it to the winform application. For the sake of time-saving, please don't mention about the WPF because of the gap between WPF and the Silverlight.

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• Customize VisualStudio syntax highlighting even more

  - by Alex K

  Hi everybody, I am wondering if it is possible to set VisualStudio IDE so it highlights private/protected/public variables of the class differently as well as change formatting on locals (i.e. variables that are either passed in or declared inside a function, like this). I did not find any such options in the normal Fonts and Colors menu of VS. Also a search on SO reveals that (at least as of 2 years ago) only add-ons provide such features. But is there a way to manually edit some file? Just because we don't get a nice UI to edit, doesn't mean underlying framework automatically doesn't support it. I mean add-ons have to plug into something to do their magic in the editor. Any insights into this issue? Thanks!

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• YouTube player api - addEventListener() does not work for me?

  - by user246114

  Hi, I'm using the youtube player api. I'm following the doc here: http://code.google.com/apis/youtube/js_api_reference.html having a problem adding an event listener on the player, it seems to just get stuck there. I put an alert statement directly after, which never gets called: ytplayer.addEventListener("onStateChange", "onytplayerStateChange"); alert("I never get called..."); any idea why this would happen? Running it through FF chrome safari, same thing happens on all. Other player features all work fine. I'm using the swfobject version. I'm running this live from a server too. I don't get it. Thanks

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• How to start develop for chinese mobile phones based on nucleus RTOS? (MTK)

  - by juckobee

  I've noticed that chinese mobile phones became very popular, perhaps because of their very reasonable price and many modern features (touch screens, advanced multimedia, double sim cards etc). I'm wondering if there's any way to develop custom solutions for this handsets as independent developer? How to obtain a toolkit and documentation? I've found some resources, but mainly inconsistent tech notes, often in chinese only. For now I know, that majority of chinese handsets are based on chips from MediaTek (MTK), with operating system based on Nucleus RTOS and MMI (plutoMMI?) framework. Unfortunately, there is no Java RE avaiable (ok, there are some handsets with Java, however, Java isn't something I'm looking for) Is there any SDK, documentation, emulators/simulators, how-tos, etc avaiable? How to develop, deploy and test custom application for MTK mobile?

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• Git & Web-design: handling multiple customized templates

  - by o_O Tync

  I'm developing a CMS (with Django, but that doesn't matter) and have chosen GIT. Installations will vary in: Configs Database contents Media Templates First 3 are not a problem with git: we simply don't need these :) While developing, I have 1 default template with related media. Later, each customer will receive his own design based on default templates (some slight customization). I'm not going to support each of the custom templates as I introduce new features. Modularity helps with this but is not a 100% solution. Do you have any experience to share?

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• Which version of Windows 7 for .NET Developers

  - by Dkong

  Hi, I'm looking to upgrade my laptop from Windows Vista to Windows 7. As a .NET developer I'm not interested in developing Windows 7 components at this stage, but was curious which version would suffice to Install Visual Studio/SQL Server and do some web development testing against the local instance of IIS. I don't care too much about the superfluous features of any Windows 7 editions, I just need to know which one will keep me right for running apps and writing some code. Also, does Windows 7 force the "run as administrator" against VS? Any recommendations?

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• How to Grant IIS 7.5 access to a certificate in certificate store?

  - by thames

  In Windows 2003 it was simple to do and one could use the winhttpcertcfg.exe (download) to give "NETWORK SERVICE" account access to a certificate. I'm now using Windows Server 2008 R2 with IIS 7.5 and I am unable to find where and how to set permissions access permissions to a certificate in the certificate store. This Post showed how to do it in Vista and that winhttpcertcfg features were added into the certificates mmc however it doesn't seem to work with imported certificates or doesn't work anymore on Server 2008 R2. So does anyone have any idea on how give IIS 7.5 the correct permissions to read a certificate from the certificate store? And also what account from IIS 7.5 that needs the permission.

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• SQL datasource for gridview

  - by Karsten

  Hi I want to use a gridview with sorting and paging to display data from an SQL server, the query uses 3 joins and the full text search containstable. The from part of the query uses all 3 tables in the join. What is the best way to do this? I can think of a stored procedure, SQL directly in the SQLDataSource and creating a view in the database. I want good performance and would like to leverage the automatic sorting and paging features of the gridview as much as possible.

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• Hooking a Stacktrace in Delphi 2009

  - by Jim McKeeth

  The Exception class in Delphi 2009 received a number of new features. A number of them are related to getting a stacktrace: property StackTrace: string *read* GetStackTrace; property StackInfo: Pointer read FStackInfo; class var GetExceptionStackInfoProc: function (P: PExceptionRecord): Pointer; class var GetStackInfoStringProc: function (Info: Pointer): string; class var CleanUpStackInfoProc: procedure (Info: Pointer); Has anyone used these to obtain a stack trace yet? Yeah, I know there are other ways to get a stack trace, but if it is supported natively in the Exception class I would rather leverage that. Update: There is an interest blog post about this. Covers it in a lot of depth.

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• WebApps tendency

  - by Narek

  There is a strong tendency of making web apps and even seems that very soon a lot of features will be available online so that for every day use people will have all necessary software free online and they will not need to install any software locally. Only specific (professional) tools that usually people don’t use at home will not be available as a web app. So my question, how do you imagine selling software that was necessary for everyday use and was not free (seems they can't make money any more by selling their product – no need of those products). And what disadvantages have web apps, that is to say, what is bad to use software online compared with having the same software locally (please list)? Please do not consider this question not connected with programming, as I would like to have a little statistics from professional programmers who are aware from nowday’s tendency of software and programming. Thanks.

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• What useful GDB scripts have you used/written?

  - by nik

  People use gdb on and off for debugging, of course there are lots of other debugging tools across the varied OSes, with and without GUI and, maybe other fancy IDE features. I would like to know what useful gdb scripts you have written and liked. While, I do not mean a dump of commands in a something.gdb file that you source to pull out a bunch of data, if that made your day, go ahead and talk about it. Lets think conditional processing, control loops and functions written for more elegant and refined programming to debug and, maybe even for whitebox testing Things get interesting when you start debugging remote systems (say, over a serial/ethernet interface) And, what if the target is a multi-processor (and, multithreaded) system Let me put a simple case as an example... Say, A script that traversed serially over entries to locate a bad entry in a large hash-table that is implemented on an embedded platform. That helped me debug a broken hash-table once.

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• Most mind-blowing C++ hack you've ever seen?

  - by sblom

  In the same spirit as the "Hidden features of X?" series, what are the most mind-blowingly well-executed "I didn't even think the language could do that!" hacks that you've ever seen in C++. For example, my recent favorite is an implementation of the "operator" --> for pre-C++0x lambdas. Another fantastic example is Multi-dimensional analog literals. (Note: this is a community wiki question to avoid the appearance of reputation-whoring.)

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• Greenspun's 10th rule in Perl?

  - by DVK

  Greenspun's Tenth Rule of Programming is a common aphorism in computer programming and especially programming language circles. It states: Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp. The questions are, 1) Would you consider this to be true of Perl interpreter? Only objective arguments please (e.g. which features of Common Lisp are implemented within the interpreter) 2) Independently, does there exist a Lisp (or at least a n ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp) implemented entirely in Perl?

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• Jira Conventions and Best-Practices.

  - by Amby

  I have been using Jira since 6months but haven;t been through any document related to various options available and how to use them for maximum output. There must be some conventions that help in better tracking of the issue. For instance, Logging work, Linking issues, creating sub-tasks. It would be of help if you can share some of the features (and the conventions) that you follow while using Jira. It may vary from team-to-team but there must be some generic rules which can be followed. Any feedback would be of help. Thanks.

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• How can I turn on DynamicCompression feature of IIS programmatically?

  - by LockeVN

  I'm making an installer program for my web application. My web application uses CSS and JS heavily, so I want to enable both Static and Dynamic HttpCompression for IIS7/7.5. It needs 2 steps: I can modified the web.config, put <httpcompression> tag, it's ok. DynamicContentCompression must be turned on in Windows Feature to make httpCompression work. Static HttpCompression is enable by default in IIS7 and IIS7.5, but Dynamic HttpCompression is not enable by default (although it's available). I can do manually by turn on: Start/ControlPanel/ProgramsAndFeatures/TurnWindowsFeatures on or Off/IIS/WWW Service/Performance features/Dynamic Content Compression, but How can I programmatically turn it on that Windows Feature? I can use PowerShell, C# in my installer. Any idea how I might be able to do this? Thanks.

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• Using Protocol Buffers in J2EE?

  - by mlaverd

  Hello everyone, I have coded a server that uses Protocol Buffers in Java. A client talks to it using PB. I'd like to migrate the server code to J2EE and take advantage of the containers' built-in features like clustering. How can I have a service that receives PB messages and interprets them properly, and then gets them handled? I was thinking of a dedicated type of servlet, but how can it be done? I'm a J2EE newbie... I'm not familiar enough with J2EE application servers to know if there is a way to make that happen. P.S. I'm looking for a solution that uses TLS sockets directly. No overhead-causing middleman protocols like HTTP are welcome here. P.P.S. Open source solutions only please.

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