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• class vs structure c#

  - by Enriquev

  I'm doing course 3354 (Implementing System Types and Interfaces in the .NET Framework 2.0) and it is said that for simple classes, with members variables and functions, it is better to use a struct than a class because of overhead. I have never heard of such a thing, what is the validity of this claim?

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• ASP.Net Email and Account validation

  - by c11ada

  hey all, i was wondering if any one can advise me on how i can go about implementing a email and account validation feature in my ASP.net website. so when a user creates an account, an email is sent to the email address used, and the user needs to verify that email address to be able to logon. thanks

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• Balancing a Binary Tree (AVL)

  - by Gustavo Carreno

  Ok, this is another one in the theory realm for the CS guys around. In the 90's I did fairly well in implementing BST's. The only thing I could bever get my head around was the intricacy of the algorithm to balance a Binary Tree (AVL). Can you guys help me on this?

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• Would ViewModels fit in the Model View Presenter pattern?

  - by Jonn

  Having used ViewModels in MVC, I was wondering if applying the same to the MVP pattern is practical. I only have a few considerations, one being that MVP is already fairly hard to implement (with all the additional coding, not much on the seeming complexity) or that ViewModels already have a slightly similar way of modeling data or entities. Would adding another layer in the form of ViewModels be redundant or is it a logical abstraction that I, as one implementing the MVP pattern, should adhere to?

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• Zend Framework - Can view helpers be user inside of partials?

  - by Bob Spryn

  Working on implementing view helpers and partials to create a group of reusable display objects. Previously addressed in my question here: http://stackoverflow.com/questions/2389531/zend-framework-when-to-use-viewscripts-partials-vs-view-helpers Wondering if partials can call view helpers of their own, and if they can whether those helpers will have access to the original view (since the partials don't).

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• how to set setEnabled: for NSButton in an NSTableView

  - by user460366

  Hi All I have an NSTableView which has three columns. The first one is a checkbox and the third one is a button. The button 'is enabled' state depends on whether or not the checkbox is checked. I am setting the table content in the awakeFromNib method and I am implementing the checkbox state in the - (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)row method. I need to find a way setEnabled: for the NSButton Thanks

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• HTML - Which element to output text?

  - by Oliver Weiler

  I'm implementing a little chat application where I receive messages from a server, which I would like to display to a user. As I'm more of a backend guy, and lacking experience in frontend development, I don't know which element would be suited best to output the text. Two options come to my mind: Using a plain div Using a textarea (as far as I understand, this is intended to be used for input). (Would also be nice if I could somehow fade in the text using JQuery).

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• Scalable chat site in python

  - by user346572

  Hey guys, I have an idea that I'd like to start implementing that at the crux of it, will basically be a chat website, and will need to support multiple rooms. Quite frankly, I'm not too sure where to begin with regards to setting up a very sturdy/scalable chat system in python (or another language if you guys believe it to be a better alternative), so any suggestions that can get me pointed in the right direction will be greatly appreciated.

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• Multithreading consulting service

  - by Gustavo Paulillo

  Hello. I am creating a service, that needs to perform the following tasks: consult bank services and persist data into DB. The dificult is: Its needed to execute each process in parallel. I mean the better choice is implementing a multithreading service, running each instance per thread. But how its done? Thanks

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• How to guard against dividing by zero when doing symbolic regression? ECJ

  - by Charlie

  I'm writing a genetic program to perform symbolic regression on a formula. I'm using ECJ. See tutorial 4 for an example of what this is and the base that I started off of. The problem comes when implementing division as a function to your genetic program. How do you guard against dividing by zero?

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• Learning functional/clojure programming - practical excersises?

  - by Konrad Garus

  I'm learning functional programming with Clojure. What practical excersises can you recommend? Online repositories with solutions would be perfect. One idea I can think of is going through all the popular algorithms on sorting, trees, graphs etc. and implementing them in Clojure myself. While it could work, it may be pretty steep and I'm likely to do it inefficiently (compared to someone who knows what she's doing).

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• Web hooks in Python: Any particular library?

  - by Gopal

  Hi .. somewhat of a noob here to web programming. Just getting my feet wet in python. I wanted to implement web hooks in python. Both at server end and client end. Is there any particular library for implementing web hooks? Or does django or twisted python handle this?

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• Paypal's "Security header is not valid"

  - by Paypal

  I'm implementing the Express Checkout? I have no problem with the first two steps:SetExpressCheckout and GetExpressCheckout,but met the "Security header is not valid" at DoExpressCheckout. The API credentials are the same! I've fixed it by changing the $environment to live in DoExpressCheckout.(The difference is that it'll use https://api.sandbox.paypal.com/nvp/ instead of https://api-3t.$environment.paypal.com/nvp) But why? Is there something wrong with https://api-3t.$environment.paypal.com/nvp?

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• What the guidelines around filters and querystring parameters in RSS Feeds?

  - by Chris Henry

  I run a site where users can content that is tagged by a special set of tags. While implementing RSS feeds, I was wondering what, if any, rules or guidelines exist for using a querystring to filter what content an RSS feed shows. For example, the feed that shows all content on the site would be: /feed If someone was interested in all the work that was tagged with fashion, the URL would be /feed?tag=fashion

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• What standards and best practices should I follow to write interoperable portlets or web gadgets?

  - by Adam

  I am trying to design the standards and patterns for implementing portlets/web gadgets with the main goal of maximizing interoperability if those components were hosted in a Java app server framework or within an existing ASP.NET technology (SharePoint webparts), or a client side-only framework. Is there any guidance anywhere of the parts of different portlet standards that are shared between most portal frameworks? Is the best I can hope for is to adhere to the JSR 168 and 286 standards and hitch my wagon to Java?

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• Question on Binary Search Trees.

  - by AGeek

  Hi, I was thinking of implementing a binary search trees. I have implemented some very basic operations such as search, insert, delete. Please share your experiences as to what all other operations i could perform on binary search trees, and some real time operations(basic) that is needed every time for any given situation.. I hope my question was clear.. Thanks.

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• Being good in jQuery == Being good in Javascript??

  - by p0larBoy

  I'm pretty efficient in jQuery, having implementing it in several projects for my company. However, I found myself a little lost when reading stuff like node.js. Do i have to go back to basics and learn the javascript language or should i just stick with jQuery?

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• NamespaceContext and using namespaces with XPath

  - by Jherico

  Resolving an xpath that includes namepsaces in Java appears to require the use of a NamespaceContext object, mapping prefixes to namespace urls and vice versa. But I can find no mechanism for getting a NamespaceContext other than implementing it myself. This seems counter-intuitive. Is there any easy way to acquire a NamespaceContext from a document, or to create one, or failing that, to forgo prefixes altogether and specify the xpath with fully qualified names?

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• cleaning up expired sessions with a custom SessionStateStoreProvider

  - by CountCet

  I'm implementing my own SessionStateStoreProvider with a schemaless database. It's a little hard to tell from the documentation but it seems as though I will have to have a separate process for cleaning up expired sessions since the database will not have a way to notify the session state store that a session has expired. Am I wrong about this? I haven't seen an alternative example for overriding the SetItemExpireCallback method.

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• how to use stream.publish method in iphone?

  - by Rohit

  I am implementing FBConnect in my iPhone App.I want to post a predifined message to all facebook friends at once of the logged in user. How to do it? Please paste the total code. Any urgent help would do. Thanks in advance.

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• Disposing the members that implement IDisposable.

  - by Amby

  In my Dispose methods (like the one below), everytime i want to call someObj.Dispose() i also have a check for someObj!=null. Is that because of bad design on my part? Is their a cleaner way to ascertain that Dispose of all the members (implementing IDisposable) being used in an object is called without having a risk of NullReference exception ? protected void Dispose(bool disposing) { if (disposing) { if (_splitTradePopupManager != null) { _splitTradePopupManager.Dispose(); } } } Thanks for your interest.

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• Multiple values one field mysql

  - by chloe

  Basically I have a a mysql database which i want to create containing the following tables: artist song album A song can belong to only one artist, however, a song could be in Multiple Albums. How would I go about implementing this in my mysql database. I've been stuck for a few days now :(

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• php-openID doesn't work with Yahoo!

  - by hd

  i am trying to use php-openid library for implementing openID in my site. the basic consumer example inside its package doesn't work for Google and Yahoo. i found the Google solution here: http://stackoverflow.com/questions/1183788/example-usage-of-ax-in-php-openid/2612816 but it doesn't still work for Yahoo! . how can i made it works?

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• Java Save Object to File

  - by Kristian Matthews

  I've tried implementing various methods from around the internet, all seem to be providing the same solution. But it just won't work and I'm unsure why, it creates the file, however, it's blank and if I try loading that file, it has an error. Main.java contains the code to save and load the file: 190-224. Rooms.java contains the object. Code Any help is greatly appreciated, I've been trying for almost a week now! Thanks in advanced!

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• How do I test how customers use my Cocoa application?

  - by John Gallagher

  I'm interested in finding out how customers use features in my Cocoa application. I want to build up statistics on which features people use and how they use them, so that I can measure the value of features I'm implementing. This feedback of course will be off by default and anonymous. Does anyone know of any frameworks that have been developed that can achieve this without me having to write stuff from scratch?

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