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• WPF Control Factory

  This article explains some advantages and disadvantages of factories, and shows one to use for generating WPF Controls.

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• What's the reason in your mind Exception are heavily used in Managed (C# and Java) language but not in C++?

  - by ZijingWu

  AFAIK, a lot of C++ projects don't allow exceptions and deny them in coding guidelines. I have a lot of reasons, for example, Exception is hard to handle correctly if your binary needs to be compiled by separate and different compilers. But it doesn't fully convince me, there is a lot of projects which are just using one compiler. Compared to C++, Exceptions are heavily used in C# and Java and the reason can only be that Exception are not bringing enough benefit. One point is Debugbility in practice. Exception can not get the call stack in C++ code, but in C# and Java you can get the call stack from Exception, it is significant and makes debugging easier. No-CallStack is not the fault of the Exception, it is the language difference , but it impacts the Exception usage. So what's the reason that exceptions are frowned upon in c++ programs?

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• What personal milestones can you use to measure growth in your programming abilities?

  - by GWLlosa

  How can you determine objectively, over time, that you are getting any better at producing code? For example, I may sit here and feel that "I know <language> now, and I use <technique> now, so I must be better." But this does not account for my own bias, or the fact that I may be getting better at a slower rate than intended, or I may actually suck at <technique> and not realize it. What methods are available for one to objectively rate one's own abilities? What about to objectively compare them to their peer groups?

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• Field List control in C#

  In this article, I would like to share one of the components that I wrote called Field List control.

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• Keeping application backend and UI synchronised

  - by Deanna

  Hi all. I have an app that works with a list of objects so has one central keyed list. The main window has a tree containing these object with some information, which is easy enough to populate as a one off event after loading. Now, the complicated part, any part of the application can add, remove, and more importantly change the details of those objects at any time (all in the same process) and I'd like the tree to update to suit. I have a few options including passing events back down from the object to the list to the form which seems to be the most flexible way. I can also do it lazily and repopulate the tree each time or periodically (very hackish). Does anyone have any better thoughts on how to structure this? This is being done in C# 2.0 but the concepts apply to any environment. Thanks

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• Can not login to Normal mode

  - by Technology is good

  I installed ubuntu 12 in my old PC Acer Power Series. After installation i got the Login Screen which appears unusally big. when i logged-in in some fail-safe mode. I got the normal ubuntu running. but if i restart the system i can login using fail-safe mode but i can't login normally. I think the problem must be i don't have a graphic card. Even if i do have one that must be very very low configuration one. Kindly help me with graphic card config if that is the problem with my PC. I just want to use ubuntu for normal documentation purpose. I am new to ubuntu so techcies help me with basic guidance. Thank you. Karthik Muralitharan

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• How to set up dual wired and wireless connections?

  - by Col

  My laptop has both wireless and a wired connection capabilities. Can I connect to a router A using wireless and a separate router B using wired ethernet at the same time without having to switch back and forth? Thanks for replying so quickly. I wish to connect to two separate networks. The wireless connection is to router A which is connected to broadband internet. The wired connection is to router B which I wish to share files and a printer on 1 or 2 other desktops also using wired connections on B and maybe using synergy to have only one keyboard and mouse for 2 desktops. The wireless laptop is the only one required to have internet access.

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• Telerik OpenAccess ORM and the XML Metadata Source

  We all know that Telerik OpenAccess ORM has a completely new face with the Q1 2010 release so it is about time to start blogging about some of the features and improvements that the new Visual Designer brought along.  Today I will talk about one of the most notable changes in the new version of OpenAccess ORM and that is the XML only mapping. You all know that so far with the previous versions of the product the mapping information was defined by a mix of XML configuration files and CLR attributes. After a lot of customer feedback and thorough thought we decided to make the XML and the attributes as two separate and self-contained sources of metadata information about your model. You can choose one based on your personal preferences. I will start with a brief overview over the new XML mapping definition. Unlike previous versions, where all ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• 12.04 install now just blank screen

  - by bull

  I have attempted to install a new copy of 12.04 using usb stick instead of using download manager. Everything went fine while using usb stick until I restarted after installation was complete. Then, I got the screen with cursor and 4 lines of script with the first line saying "could not write to bytes: broken pipes". I have used several versions of Ubuntu from 6.04, but this one seems broken. I have tried nouveau.blacklist and many other suggestions to no luck. I am using hp pavilion m7790y dual core processor system, with nvidia 7600gt video card, 4gb ram and two hard drives with Vista on one and fresh install of Ubuntu 12.04 on other. I'm still looking for help to solve this problem. Thanks in advance.

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• Delete all traces of windows from Ubuntu

  - by TheOm3ga

  I used to have a dual boot in one of my hard disk drives - Ubuntu and Windows 7. Then, I added a SSD which is now my main hard disk drive, and I'm using it for Windows 7 completely, keeping Ubuntu in the old HD. I restored the Grub so everything works ok, except for one thing. Everytime I update the grub, it detects two windows: Found Windows 7 (loader) on /dev/sda1 Found Windows 7 (loader) on /dev/sdb1 Obviously, I don't want it to detect the Windows on sdb1. Because I no longer use it (I manually deleted the files). What can I do about that without wiping out completely the partition?

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• Should I choose a programmer or on-site (QA) job?

  - by user3978

  This question is for all the professionals who have been in IT industry from long time. I have 4 years of experience in QA (manual testing) from a MNC located in India. I have been thinking about pursuing software developers job so I applied for some companies as a fresher and one company offered me to take as entry-level engineer. But my present company does not want to loose me and they are offering me an on-site opportunity? So which one should i go for Programmer job or on-site (QA) in terms of long term perspective?

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• I finished "Beginning Android Games", should I use its framework?

  - by orod

  I've worked through Mario Zechner's "Beginning Android Games" and have made my own pong and asteroids game using the framework used in the book. I have also downloaded the source code for Replica Island and am able to run that. I like Replica Island's framework over the one I made from reading the book. Some differences are that Replica Island uses different activities for each screen instead of Zechner's Screen class and that Replica Island can use a lot of textures and isn't limited to textures with dimensions of powers of 2. If I'm serious about writing games and apps for Android should I learn Replica Island's framework and use that instead of the one I made while reading Zechner's book?

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• TypeForwardedToAttribute

  Walkthrough: Forwarding a type from one assembly to another by using the TypeForwardedToAttribute attribute.

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• How much time do you need in between large projects?

  - by Mattio

  You've launched a large project at work, something that's been in progress and taken up large chunks of your life for more than 6 months. The post-launch triage is over. Tech support isn't calling you every hour because they don't know how to troubleshoot an issue. Your hours drop from 60+/wk to whatever is normal in your organization (which is hopefully less than 60+!). How much time do you (or your team) need before the next large project begins? I was asked this question at work and I think the ideal minimum is two weeks -- one week to clear your desk and inbox + one week to clear your head and remember what it's like to have a life outside of work. I'd frankly acknowledge that just being asked this question is a huge boon to work/life balance. But I do think it's possible to go too long in between.

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• Why use binary files to stack up different versions on DMSs?

  - by edgarator

  I've used both Liferay and Alfresco trying to use them as the Document Management System for an intranet. I noticed the following: They use the file system and the database to store files They use a GUID to name the file on the filesystem and that GUID is used as an Id in the database. The GUID-named file is a binary file The GUID-named binary file stores all versions for a given file The path for the file in the DMS doesn't match the one in the file system The URL makes reference to the GUID when a certain file is requested What I want to know is why is this, and what would be the best way of doing it. Like how to would you create the binary file (zip?), and what parts would you keep in the binary file and what parts would you store in the database (meta-data, path?). I'm assuming some of the benefits of doing it like this. As having the same URL for a file, regardless of its current document path. And having only one file even if the file has changed names over time.

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• Distinguishing between sets of status reports

  - by user1769486

  I am working on an internal database monitoring system and am at a point where I sort of hit the wall in terms of application design. Basically I have an extensible plugin architecture where I shall have an OK, a warning or an error upon running a db verification. My first question whether it is sufficient to have only one status reported with an optional status message or provide the ability to have more than one returned (with attached messages) and then calculate an aggregated overall status. In particular in the latter case my second issue would be how to distinguish between two verification reports with the same status code (as it can come from different triggers). I would need to do this to see whether some change happened between the current and last verification. I could simply have string comparisons of the attached status messages mentioned above but that does not seem very reliable.

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• Introduction to JQuery UI

  In this series, we will cover one of the plug-in of JQuery called as JQuery UI.

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• Transfering site from shared to vps account

  - by N e w B e e

  I got a hosting account at HOSTGATOR. it was a shared account and i had three websites present over there. now, i have upgraded my account to VPS at HOSTGATOR and i want to transfer only ONE website over the new VPS. say, mydom.net. this website includes wordpress installation and other custom pages and setup can somebody please guide me How can I transfer the web to my new account? with speed, accuracy, and such that my website remains in working condition.. what will I do about wordpress? simply copy it will work?(I dont thnk so), if not how can I move it? I need guideline. and I am asking the question with a hope that many others will also learn the things just as i am learning,, and one quick thing, answering it like creating a manual can help people a lot...that's my thinking.. thanks to all

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• What's New in JMS 2 - Part 1

  - by reza_rahman

  JMS 2 is one of the most significant parts of Java EE 7. One of the principal goals of the JMS 2 API is improving developer productivity by reducing the amount of code to work with JMS by adopting programming paradigms like higher level abstractions, dependency injection, annotations, runtime exceptions, the builder pattern and intelligent defaults. In a recent OTN article, JMS 2 specification lead Nigel Deakin covers the ease-of-use changes in detail. The article is the first of a two part series on JMS 2. For more visual folks, there is my JMS 2 slide deck: What’s New in Java Message Service 2 from Reza Rahman You can also check out the official specification yourself or try things out with the newly released Java EE 7 SDK.

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• Redesigning an Information System - Part 1

  - by dbradley

  Through the next few weeks or months I'd like to run a small series of articles sharing my experiences from the largest of the project I've worked on and explore some of the real-world problems I've come across and how we went about solving them. I'm afraid I can't give too many specifics on the project right now as it's not yet complete so you'll have to forgive me for being a little abstract in places! To start with I'm going to run through a little of the background of the problem and the motivations to re-design from scratch. Then I'll work through the approaches taken to understanding the requirements, designing, implementing, testing and migrating to the new system. Motivations for Re-designing a Large Information System The system is one that's been in place for a number of years and was originally designed to do a significantly different one to what it's now being used for. This is mainly due to the product maturing as well as client requirements changing. As with most information systems this one can be defined in four main areas of functionality: Input – adding information to the system Storage – persisting information in an efficient, searchable structure Output – delivering the information to the client Control – management of the process There can be a variety of reasons to re-design an existing system; a few of our own turned out to be factors such as: Overall system reliability System response time Failure isolation and recovery Maintainability of code and information General extensibility to solve future problem Separation of business and product concerns New or improved features The factor that started the thought process was the desire to improve the way in which information was entered into the system. However, this alone was not the entire reason for deciding to redesign. Business Drivers Typically all software engineers would always prefer to do a project from scratch themselves. It generally means you don't have to deal with problems created by predecessors and you can create your own absolutely perfect solution. However, the reality of working within a business is that the bottom line comes down to return on investment. For a medium sized business such as mine there must be actual value able to be delivered within a reasonable timeframe for any work to be started. As a result, any long term project will generally take a lot of effort and consideration to be approved by those in charge and therefore it might be better to break down the project into more manageable chunks which allow more frequent deliverables and also value within a shorter timeframe. As the only thing of concern was the methods for inputting information, this is where we started with requirements gathering and design. However knowing that there might be more to the problem and not limiting your design decisions before the requirements is key to finding the best solutions.

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• Application of LGPL license on a simple algorithm

  - by georgesl

  The "scope" of the GNU license is troubling me : I know it has been answered many times ( here, here, ... ) but shouldn't we take into consideration the complexity and originality of a code before using GPL license ? I explain : I'm working on a pet project using the DTW algorithm that I have written in C using the pseudo-code given on the wikipedia page . At one point I decided to change it for a C++ implementation ( just for hone my c++ skill ) . After doing so, I've looked for an existing implementation on the web, to compare the "cleanliness" of it, and I found this one : Vectored DTW implementation, which is part of limproved, a C++ library licensed under GPL v3 . Personnally, I don't mind the GNU license because it is a personnal project, which will never led to any kind of commercial purpose, but I wonder if this implementation can abide a company using it to open their code ( and other FOSS permissions ). Theoretically, I think it can ( I may be wrong :p ), but the algorithm in question is so simple (and old) that it should not.

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• How do you get users to rank their software enhancement needs?

  - by Lego Stormtroopr

  I've inherited a legacy software system, and have been tasked with performing usability and system upgrades. While there's nothing bad with the system, from discussions with the users, there are "small" usabilty issues that need to be addressed. At this stage I'm the lone developer on this system, and apart from testing I don't use the system at all, so its difficult for me to know what issues may exist or are percieved to exist. I'm going to have some time to speak with them all and discuss what they percieve to be good/bad or indifferent about the system. Since its essentially just me for the time being my time is limit. So I was considering asking them to imagine that I'd only be able to do one change, have them all write privately what they'd want that one change to be, and then helping them rank those, but I'm hoping for other tips as well. What techniques exist for getting users to explain their wants, needs, and requirements, while also having them rank them by importance or desirability?

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• The network printer will only print blank pages and will not stop. What should I do?

  - by LibraryGeekAdam

  I work in a library, so we have a Ricoh printer that is networked between all of us. I just recently installed Ubuntu 11.10 64bit on my desktop and have been trying to set up the printer without success. Ubuntu found the printer immediately and allowed me to set it up. When I hit test print, I get one sheet with writing on it and then it prints blank pages and will not stop until I turn off the printer. I tried printing from a document and I get the same one page with writing and then all the blank pages again. Below is what the page says with writing on it. I'd appreciate any help anyone is willing to give. Thanks. %!PS-Adobe-3.0 %% %% mark () () (bunch of numbers) {setuserinfo} stopped cleartomark %%%!

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• How do you diagnose constant crashing issues?

  - by P102

  My recent installation 10.10 on my laptop keeps freezing/crashing on start-up after working perfectly for one day. The system just freezes, like a screnshot, and a restart is required. It happens directly after login or just as any application is selected. Nothing new has been installed. I have just moved from XP so I would be very grateful if some one could please explain to me, as simply as possible, how to do the following... How to diagnose the problem so it can be fixed, remember it may have to be before the log in. all help is greatly appreciated.

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• From the Coalface - 2 - Work as hard as you can to be as lazy as you can

  - by TATWORTH

  On one project, the standard build involved building the database from scratch producing a build log that was about 100,000 lines long.  Manually paging throught this log took hours and it was very easy to miss any errors. The solution was to write a filter that read the log file and output a summary file with each output line pepended with the line number in the original file. Sucessive iterations eliminated more noise lines. Diagnostic displays required escaping. The final output was just a few hundred lines long and the errors were easy to spot. The filter program took less time to to write than one manual pass reading the log file.  The utility digested the log file in about 1 second. Now database build errors could be identified quickly instead of after hours of manual examination or lengthy system testing. A few minutes consideration of the task led to a tremendous improvement in quality.

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