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• What technical skills needed for algorithmic trading, HFT, etc?

  - by alchemical

  I'm interested in getting into developing trading systems, black box, HFT, etc. My primary experience is with C# and .Net (7 years). I've also done some sockets programming. I have some experience in finance working on analysis applications (2 years). My goal is to move into developing automated trading systems for a hedge fund, bank, etc. Is there any way to learn the skills needed for this without somehow getting the job first? I've looked at the open source tradelink, IB interactive brokerage, etc. I'm playing around with this framework, and may hook it up and do some paper trading. However, I'm not sure if this has much relationship with how a well-funded entity would be conducting a high-level automated trading operation. I.e. would the tools and frameworks they prefer be a totally different skill-set? Also wondering if I need to learn C++ and/or Java for these types of apps.

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• WPF Application doesn't work on some machines: Stopped working error

  - by Hun1Ahpu

  My WPF application works fine on a number of machines, but now I get a report about this error on a user machine: Description: Stopped working Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: mysoftware.exe Problem Signature 02: 1.0.0.1 Problem Signature 03: 4bbcd9d9 Problem Signature 04: PresentationFramework Problem Signature 05: 3.0.0.0 Problem Signature 06: 4a174fbc Problem Signature 07: 624f Problem Signature 08: e1 Problem Signature 09: System.Windows.Markup.XamlParse OS Version: 6.1.7600.2.0.0.256.48 Locale ID: 1033 I was trying to catch Exception using Application DispatcherUnhandledException but this didn't help. And warping Window1 constructor in try/catch block too. .NET Framework 3.5 is installed on that machine. How can I figure out the reason of crashing: log this error, debug, ...?

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• reinventing the wheels: Node.JS/Event-driven programming v.s. Functional Programming?

  - by ivanTheTerrible

  Now there's all the hype lately about Node.JS, an event driven framework using Javascript callbacks. To my limited understanding, its primary advantage seems to be that you don't have to wait step by step sequentially (for example, you can fetch the SQL results, while calling other functions too). So my question is: how is this different, or better than just functional languages, like CL, Haskell, Clojure etc? If not better, then why don't people just do functional languages then (instead of reinventing the wheel with Javascript)? Please note that I have none experience in either Node.JS nor functional programming. So some basic explanation can be helpful.

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• How to stop SWF inside of a jQuery UI tab from reloading

  - by Raul Agrait

  I have a SWF movie inside of a jQuery UI tab, and the problem I'm having is that the SWF gets reloaded everytime I click away from the tab, onto another tab, and then click back. I can inspect the DOM and see that the div containing the SWF is still in the DOM when I click away, so I don't know why this it seems to reload it when I click back to the tab. I added the following CSS rules to try to prevent the display being set to: none, but the Flash movie is still reloading: .ui-tabs .ui-tabs-hide { display: block !important; position: absolute; left: -10000px; }

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• learning OO with PHP

  - by dole doug

  Hi there I've started to learn OO programming, but using the PHP language with the help of the "PHP 5 Objects, Patterns, and Practice" book. The thing is that I wish to learn to use into same time the CakePHP framework which make use a lot of the MVC pattern. Because I don't know much about OO and less about MVC I wish to understand the later one but assumptions I make with my OO knowledges might have bad impact on long term. Does anyone know a good tutorial about what means MVC (more than cakephp manual says about it, but more easy to read/understand than wikipedia)? TY

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• Dynatree multi - selection implementaion ala Windows style

  - by gnomixa

  I would like to implement windows style multi-selection: when user holds CTRL key and selects several nodes of the tree. Dynatree (from here http://wwwendt.de/tech/dynatree/doc/dynatree-doc.html) by default has checkboxes for node selection which my client doesn't seem to like. My question is, is it possible to implement what I need using provided set of callbacks? also, curently, when I hold CTRL key and click on the node, it opens a new window. Is there any way to suppress this functionality? i am guess I would have to do through CSS?

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• Preparing a Universal App for iPhone SDK 3.2

  - by user133611

  Hi all, I am working on a universal app, I used UISplitViewController in doing iPad application. I followed the Universal app guidelines i.e, i keep base SDK as 3.2, iPhone Target OS ad iPhone OS 3.1.3, Taget device as iPhone/iPad. And i used "Adding Runtime Checks for Newer Symbols" for UISplitViewController and UIPopOverController. Class splitVCClass = NSClassFromString(@"UISplitViewController"); if (splitVC) { UISplitViewController* mySplitViewController = [[splitVCClass alloc] init]; // Configure the split view controller. } I used this in .m files I declared UIPopOverController in .h files also "dyld: Symbol not found: _OBJC_CLASS_$_UIPopoverController Referenced from: /var/mobile/Applications/9E0CE75F-D2A9-4132-AE56-1780928BCF21/UniversalTasks.app/UniversalTasks Expected in: /System/Library/Frameworks/UIKit.framework/UIKit in /var/mobile/Applications/9E0CE75F-D2A9-4132-AE56-1780928BCF21/UniversalTasks.app/UniversalTasks" What i have to do can any one help me out

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• Jquery show function issue - not animating or showing the hidden paragraph, why

  - by dave

  Here is the html: $( document ).ready( function( ) { $( "#testing" ).click ( function( ) { $( "#testing2" ).show( "slow" ); } ); } ); Link lksjflksjdlkflskdjflksjdflkjslkjdflk lsdkflksjgliowtjlskdfjlskdfjlskgs lksjlk,.x,cmlkvjlkjlwkeoltklfnjsklkj lksjf.m,.jlkjoliwekjtlkjgkjjlkjlkjll llvalkiwujoitjlkgskjdkgjlsd,fjlsllll Here is the css: testing { width: 100px; height: 50px; border: 1px solid; font-size: 22px; display: block; text-align: center; padding: 25px 0px 0px 0px; } testing2 { display: none; width: 270px; height: 300px; background: yellow; border: 1px solid; } For some reason, when i click the link, it does not show the paragraph #testing2, why?

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• Main pricing and support for individual client pricing (Database Architecture ideas help - Rails)

  - by slythic

  Hi all, I have a personal project I'm planning and I came to a small hurdle. I want to have an item with price that will be the default for all clients/users. However, in my business I have some clients that are grandfathered in to some special pricing. In the case of these grandfathered in cases, I'll manually plug their special price in my admin section. Then all they will see is their special pricing while the regular users/clients see the default price. What is the best and simplest way to design the back-end for this? FYI - I'll be using rails as my framework. Many thanks! -Tony

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• Removing an Entity from an EntitySet during Iteration...

  - by Gregorius

  I've got this code... seems nice and elegant, but apparently the framework don't like it when i mess with a collection while iterating through it: foreach (KitGroup kg in ProductToTransfer.KitGroups) { // Remove kit groups that have been excluded by the user if (inKitGroupExclusions != null && inKitGroupExclusions.Contains(kg.KitGroupID)) ProductToTransfer.KitGroups.Remove(kg); else { // Loop through the kit items and do other stuff //... } } The error it throws when it iterates to the 2nd object in the collection is: "EntitySet was modified during enumeration" I know i could create a new collection of KitGroup objects (or even just IDs) that i want to remove, and then another loop afterwards to loop through these, and remove them from the collection, but this just seems like unnecessary extra code... can anybody suggest a more elegant way of achieving the same thing? Cheers Greg

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• MVC in a Google App Engine Java world

  - by thatismatt

  I'm coming to Java from C# & ASP.NET MVC, I'd love to find an equivalent in the Java world that I could use on the Google App Engine. I've already started to have a play with FreeMarker and even made the first steps towards writing a very simple framework. Ideally I wouldn't have to do all the hard work though, someone must have done this already! So my question is - what frameworks are there out there that would be familiar for me coming from ASP.NET MVC and I could use them on Google App Engine for Java. The key things I'd want are: Simple Routing - /products/view/1 gets mapped to the view action of the products controller with the productid of 1 Template Engine - some way of easily passing 'ViewData' to the view, and from the view easily accessing it, ideally I'd love to avoid anything that is too XMLy (thus why I like FreeMarker).

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• grouping data from two dataset

  - by Garcia Julien

  hi, i've got a problem with dataset: I've got two dataset from two different server but they have the same columns. so it's like that: First DataSet : asset description make jobtype jan feb ... dec 0001 mine ik Acc 0 0 10 0002 yours ic Over 0 0 10 Second dataset : asset description make jobtype jan feb ... dec 0001 mine ik Acc 10 0 10 0002 yours ic Gen 0 0 0 But i would like to merge the 2 dataset into one like that: asset description make jobtype lhjan imjan lhfeb lhfeb ... lhdec imdec 0001 mine ik Acc 0 10 0 0 10 10 0002 yours ic Over 0 0 0 0 10 0 so all the data from one is combine with the second with the same asset and the same jobtype. I try linq but i can't arrive to make it like i want. I'm working on vb.net framework 3.5. could you help me? Julien

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• Running a custom VirtualPathProvider with a PreCompiled website

  - by epilog

  Hi, currently I have a custom VirtualPathProvider in a Asp.net MVC web application. This VirtualPathProvider checks the Area from the route "/{Area}/{Controller}/..." and uses the NameSpace.{Area}.Main.dll module to return the views that are contained in that assembly as Embedded Resources. This works great and I don't have to deploy any ascx, js, css files. Now my problem is this: I would like to precompile the aspx and ascx files in the assembly and instead of having the views as embedded resources I would have the view class with all the Response.Write and dings and dongs. I can precompile the views using the aspnet_compiler but I keep getting an error when ever the ViewEngine tries to find the view and fails. My main goal is to have a way for the first time usage of a certain view/usercontrol would be faster and don't wait for the compilation to happen. This is a requirement since the application could be grouped into plugins and this plugins be deployed into the Bin directory. Any thoughts? With best regards Carlos Sobrinho

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• Membership provider stopped working on using Membership Provider in ASP.Net MVC

  - by Michael Meadows

  I have a production ASP.Net MVC application that has been using the membership service. It has worked fine, up until today. Nothing has changed on the server, but I now have this error: System.Configuration.Provider.ProviderException: The 'System.Web.Security.SqlMembershipProvider' requires a database schema compatible with schema version '1'. However, the current database schema is not compatible with this version. You may need to either install a compatible schema with aspnet_regsql.exe (available in the framework installation directory), or upgrade the provider to a newer version. I checked the asp_schemaversions table, and it looks fine. Please any help would be appreciated.

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• Small standalone SQL database similar to access in the old days(ie file database)

  - by Ian

  Hi, I am looking for a easy to use and deploy sql type database i can ship with a desktop application. This will be a small application user's can download from my website. In the vb6 days, access was the common database for small desktop apps, what is my option these days? Looking at SQL CE it seems to have a quite a few limitations such as count(distinct) etc SQL express needs to be installed and running as a service (could i include the SQL express deployments in my deployment so the user doesn't even know its been installed? I assume size would then be an issue) SQL 2005/2008 is not an option due to size and licensing restrictions. I would like to use c#, wpf and entity framework. What would seem to be the best options based on your knowledge and experience? Thanks

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• Transalation of tasks in .NET 1.1 to .NET 3.5

  - by ggonsalv

  In .Net 1.1 I would run a stored procedure to fill a typed dataset. I would use a Datareader to fill the dataset for speed (though it was probably not necessary) Then I would use the Dataset to bind to multiple controls on the page so as to render the data to multiple CSS/javsript based tabs on the page. This would also reduce the database call to 1. So I know I could this in 3.5, but is there a better way. For example can one stored procedure create an EDM object to be used. Since the data is mainly readonly should I even bother changing or keep using the Stored proc -> Data set -> Bind individual controls to specific data tables

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• A control that contains multiple duplicate properties causing deadlock issues on IIS

  - by heads5150

  I am trying to work out if the above case is true for our site. I've been told by my hosting provider that this fix (http://support.microsoft.com/kb/974165) has to applied to our server due to performance issues. It basically describes an issues where UI code like: <asp:gridview id="GridView1" runat="server" ... PageSize="100" PagerSettings-Mode="Numeric" PagerStyle-BorderStyle="None" PagerStyle-BorderColor="Navy" PagerStyle-HorizontalAlign="Right" PagerSettings-PageButtonCount="2" PagerSettings-Position="Bottom"> <PagerStyle HorizontalAlign="Left" BorderColor="Navy" BorderStyle="None"></PagerStyle> ... <PagerSettings PageButtonCount="2"></PagerSettings> ... </asp:gridview> causing the following warning on the server "ISAPI 'C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'." Does anybody know of a way that I can detect this issue in the build process or the debugger? Any help would be much appreciate.

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• Using Timthumb to Resize Images from CKEditor

  - by Edward Coleridge Smith

  I am using CKEditor to do basic text and image input into my website. I have noticed that it is quite sporadic in it's method of generating HTML for images when you add them. (Sometimes it might use height and width tags, other times it might use CSS). I use Timthumb for on the fly image resizing on a number of other websites and find it very useful. I use a mod_rewrite rule in my .htaccess file to allow me to create domains like http://localhost/images/800x600/image.jpg and achieve resizing. I would like to somehow incorporate this into CKEditor. I cannot find how to do this looking through the documentation so I have tried post-processing the data produced by CKEditor using Regex, however as mentioned before CKEditor seems to be too sporadic to be able to get this to work all the time. Anyone else done this before? How did you achieve it?

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• Hooks...exactly what they are

  - by Ygam

  I have seen hooks in Kohana PHP framework, and they work as some sort of a callback function triggered by a certain event (Kohana's events that is, some sort of method overloading). I have seen hooks in Wordpress, and I don't know what they are or how to use them (just saw them yesterday). I'm looking for events in "non-frameworked" php, I cannot find ones. Do hooks work only in an "event-based" environment? What are they anyway (in general, not just in PHP)? What are they good for if not in an "event-based" environment.

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• Proper implementation of NLog and Prism

  - by WiT8litZ

  What would be the best way to implement NLog in my Prism / CAL WPF application. This might be an amateur question, I am a bit new to the whole Prism framework :) I thought about putting the reference to the NLog dll in the Infrastructure module and make a wrapper singleton class e.g. MyLogger. My thinking was to be able to have the reference to 1 logger implementation somewhere in a central place that everything has reference to, and the only thing that I know of in Prism would be your Infrastructure module. The obvious other way is to add a reference to NLog to each module but I think that would defeat the purpose of decoupling and all of that. Any ideas would be most helpful Regards

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• Should we tell our expected and current CTC just in mail before interview?

  - by jitendra

  Should we tell our expected and current CTC just in mail before interview? I read on many resume advices "never put salary info in resume" but these day every company ask expected CTC then takes interview. What should i give in reply to this type of mail where company is asking for expected and current CTC before interview? Can they appoint me directly , without interview? Should i ask any other question to company before giving expected and current CTC? Hi, This is Mikel from london I found your resume on a job portal and it's very good .We have very urgent requirements @ london. Requirement1 : Senior Web Designer Experience: min4+yrs Skills:HTML,Adobe Photoshop, Javascript,CSS, Dreamweaver,Accessibility Etc.. If you looking for change just forward your latest resume to [email protected] along with these details Contact Number: Current CTC: Expected CTC: Notice Period: Current Location: Like to Relocate to London (Y/N):

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• LinqToSQL _conn ? LinqToSQLConnection ?

  - by nCdy

  here is a code : using System; using Nemerle.Collections; using Nemerle.Text; //using Nemerle.Utility; using System.Linq; using Nemerle.Data.Linq; using NUnit.Framework; using System.Data.Linq; namespace LinqTestes { [TestFixture] public class Linq2SqlTests { static ReadConnectionString() : string { def currAssm = Uri(typeof(Linq2SqlTests).Assembly.CodeBase).LocalPath; def path = IO.Path.GetDirectoryName(currAssm); def connStrPath = IO.Path.Combine(path, "connectionString.txt"); def connStr = try { IO.File.ReadAllText(connStrPath, Text.Encoding.UTF8) } catch { | e is IO.FileNotFoundException => throw IO.FileNotFoundException( $"You should define connection string to NorthWind DB in: '$connStrPath'", e.FileName, e) }; connStr } _conn : LinqDataConnection = LinqDataConnection(ReadConnectionString()); and I'm making the same but what is LinqDataConnection type ? and where does it comes from ?

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• Is there an HTML browser rendering engine for Ruby?

  - by Jose

  Given a URL, I would like to be able to render the returned HTML to know width and height for each div, fonts' size for each piece of text, color of each element, position of each element on screen, etc. A possible approach could be traversing the DOM tree with Hpricot and checking CSS style by parsing the associated stylesheet using css_parser gem. But this would not consider default styles, inheritance, floats, etc. In Java there's Cobra, a Java Web Renderer, which is able to render a web page and query attributes like width, font size, etc. for each fragment. I could use Cobra with JRuby or similar solutions, but prefer a Ruby native tool. Is there any library like this for Ruby?

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• Ideas for web development practical jokes?

  - by Ellie P.

  I am a web developer for a Django-based site for a student organization, and I have the opportunity to make the website temporarily absurd for a day of general campus-wide debauchery and chaos (long story, doesn't matter.) What are your best ideas for web development practical jokes (that you could never use in the real world)? For example, one idea we had was to use a client-side script to convert each character to its upside down equivalent in Unicode, si?? ??i? ?ui????os. I'm not necessarily looking for Django-specific solutions. I imagine most of these things would happen on the front-end. I am also quite aware that usability will suffer considerably--the point is to be fun for a day, and there will always be a link to the normal version of the site. Also, everything must be relatively cosmetic and easily reversible--I'm happy to swap out static CSS/JS/HTML/templates/images, and even temporarily add a django view, but no messing with the data level!

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• how to stop directory structure from being viewable in J2EE apps

  - by Omnipresent

  in a J2EE app if user explicitly takes out the the ending page name then what is the best way to not show the directory structure? Example: /mycoolapp/somefolder/test.jsp /mycoolapp/somefolder/ -- this will show all the files under 'somefolder' What is the best way to redirect or show the user a page saying 'not where you belong'. I want to avoid providing index.jsp in all the folders/subfolders of my application. Appserver being used is GlassFish. Also the app is using Struts2 framework, though not all of the code is in struts2. Some code is using traditional Servlets

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