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• Silverlight 4 + RIA Services - Ready for Business: Authentication and Personalization

  To continue our series,  In real business applications our data is often very valuable and as such we need to know who is accessing what data and control certain data access to only users with privilege.  Luckily this is very easy to do with RIA Services.  For example, say we want to let only authenticated users access our data in this example.   That is as easy to accomplish as adding an attribute, see line 2 below.    1: [EnableClientAccess] 2: ...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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• Looking for a better Factory pattern (Java)

  - by Sam Goldberg

  After doing a rough sketch of a high level object model, I am doing iterative TDD, and letting the other objects emerge as a refactoring of the code (as it increases in complexity). (That whole approach may be a discussion/argument for another day.) In any case, I am at the point where I am looking to refactor code blocks currently in an if-else blocks into separate objects. This is because there is another another value combination which creates new set of logical sub-branches. To be more specific, this is a trading system feature, where buy orders have different behavior than sell orders. Responses to the orders have a numeric indicator field which describes some event that occurred (e.g. fill, cancel). The combination of this numeric indicator field plus whether it is a buy or sell, require different processing buy the code. Creating a family of objects to separate the code for the unique handling each of the combinations of the 2 fields seems like a good choice at this point. The way I would normally do this, is to create some Factory object which when called with the 2 relevant parameters (indicator, buysell), would return the correct subclass of the object. Some times I do this pattern with a map, which allows to look up a live instance (or constructor to use via reflection), and sometimes I just hard code the cases in the Factory class. So - for some reason this feels like not good design (e.g. one object which knows all the subclasses of an interface or parent object), and a bit clumsy. Is there a better pattern for solving this kind of problem? And if this factory method approach makes sense, can anyone suggest a nicer design?

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• How to get "Fn" keys to work (Asus 4830T)? (specificly, the "suspend" key)

  - by Pointy

  I've got an Asus 4830T onto which I've just re-installed 12.04 because I installed an SSD. I was running 12.04 before too, which had been upgraded over a few releases. At some point on that old install, I had gotten all the "Fn" keys to work, or at least all the ones I cared about. (Oh except I think the screen brightness keys never worked.) I have no recollection of what I did. Anyway now things are fine, and some of the Fn keys work: the one to turn of the trackpad and the one to turn off wireless (grr I hate that one). However, the "suspend" key for some reason does not work. Now the system will suspend and resume just fine, but I'm having to do it from the menu. Is there an easy (or hard) way to make those work? I'm running straight Ubuntu but with Xfce installed as my normal desktop. (In other words, it's not Xubuntu, though I doubt it matters.) I recall at some point having found some arcane mapping mechanism to bind the Fn keys to actions, but I can't find it now. (I'm perfectly OK with editing weird files; I'm a long-time Unix user.) (Very long-time.)

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• Setting up a GUI-based libvirt VM

  - by LibertasMens

  I am attempting to create a virtual machine using libvirt that will have a GNOME GUI and remote accessibility. I have successfully set up the VM to run, but I am unable to access it remotely. The command issued to build the VM: sudo vmbuilder kvm ubuntu --suite=precise --flavour=generic --arch=amd64 --mirror=http://de.archive.ubuntu.com/ubuntu -o --libvirt=qemu:///system --part=/usr/xxxx/vmbuilder.partition --templates=/usr/xxxx/mytemplates --addpkg=nano --addpkg=unattended-upgrades --addpkg=acpid --firstboot=/usr/xxxx/boot.sh --cpus=2 --mem=4096--user=xxxx --name=xxxx --pass=xxxx --hostname=xxxx --bridge=br0 My intent is to have a virtual machine that my client can remotely access with a GUI.

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• ODAC 11.2 Release 3(11.2.0.2.1)?????:64bit?ODP.NET?TimesTen????

  - by Yusuke.Yamamoto

  ODAC 11.2 Release 3(11.2.0.2.1) ??????????? Oracle Data Provider for .NET(ODP.NET) ?? Oracle Providers for ASP.NET ?64bit??????????????? ????????·????????? Oracle TimesTen In-Memory Database ??????????????? Oracle Data Access Components(ODAC) ?????? Oracle Data Access Components(ODAC) ?????? ??? .NET ????????? .NET ?????????????????? Oracle Database ????????? ???????/???1????!.NET + Oracle Database 11g ???????????? ?????????? .NET|???????????

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• A Fast CSV Reader

  A reader that provides fast, non-cached, forward-only access to CSV data.

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• Database for Ubuntu

  - by Toby J

  I am trying Ubuntu 12.04 booted from a DVD disk before I install it. I currently havwe windows 8 (which I hate) and I have a couple of Data base programs with my movies, hundreds of movies, in them. Is there a database available for Ubuntu that is compatible with Microsoft Database? There are too much data in the current database file for me to have to rewrite the program. So far, I love the Ubuntu 12.04. I have been able to access my microsoft works spreadsheet files and documents with no problem. And I like the thuderbird email and just about everything else about Ubuntu 12.04. I just need to be able to access my database files and to write lables and envelopes. Thanks. Toby J Paris, TN

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• I installed Ubuntu alongside Windows but I can't see it in Windows' boot menu

  - by André Hallé

  I have a second machine where Ubuntu 12.04 LTS and Debian Squeeze are installed on the same HD and when I boot, I have this grub menu where I can choose which partition I will used. It works perfectly! But in my Windows environment that's another story. Now after making almost everything that I know, to make it work along Windows 7, there is no entry in the boot menu of Windows (I know, Ubuntu use grub but anyway there is surely a way to fix it, access it?). Why there is no Ubuntu entry? Why the installation gave me no error while I have this strange situation of having a "ghost OS" called Ubuntu installed somewhere in my second HD in a partition made especially for it and not being able to access it, starting it, having it working? Am I wrong? If I am, what's the problem? If I'm not, what's the need of Wubi?

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• How to connect Empathy to facebook

  - by Simanta Das

  I am a new user of Ubuntu and I want to connect empathy internet messaging with Facebook. So when I select Facebook from the list given in Online Accounts a window opens up for me to authorize access and a url opens saying: Success SECURITY WARNING: Please treat the URL above as you would your password and do not share it with anyone. Although after this nothing happens... When I open the messenger nothing comes up and in Online Accounts it still asks: Please authorize Ubuntu to access your Facebook account... but I have already given permission... Please help me out. Thanks in advance.

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• Feedburner is Displaying an Inactive Email Address When Logged In

  - by Cynthia

  I have set up a Feedburner subscription through my Google account login. For some reason Feedburner displays an old inactive email address in the top right when logged into Feedburner. I'm concerned since I don't have access to this email account. If for any reason I need to move my Feedburner Feed I'm concerned I'll need to access this email account which is impossible. My email address is correct in every other Google account, profile etc. and has been updated to a working and correct email address. How can I change this? Do I need to be concerned?

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• Encryption over gigabit carrier ethernet

  - by Roy

  I would like to encrypt traffic between two data centres. Communication between the sites is provided as a standard provider bridge (s-vlan/802.1ad), so that our local vlan tags (c-vlan/802.1q) are preserved on the trunk. The communication traverse several layer 2 hops in the provider network. Border switches on both sides are Catalyst 3750-X with the MACSec service module, but I assume MACSec is out of the question, as I don't see any way to ensure L2 equality between the switches over a trunk, although it may be possible over a provider bridge. MPLS (using EoMPLS) would certainly allow this option, but is not available in this case. Either way, equipment can always be replaced to accommodate technology and topology choices. How do I go about finding viable technology options that can provide layer 2 point-to-point encryption over ethernet carrier networks?

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• Complex string matching with fuzzywuzzy

  - by That1Guy

  I'm attempting to write a process that matches obscure strings to a single 'master string' for further processing. I have a lot of data that looks something like this: Basketball Basket Ball Football BasketBallR BBall BBall - r FootB ...and so on. These need to be mapped to a master record like so: Basketball = Basket Ball, BBall Basketball - R = BasketBallR, BBall - r I also have instances of data resembling this format: Football -r FootBall - r-g/H,Q,HH These situations need to be separated into different categories before being mapped. For example FootBall - r-g/H,Q,HH should be: Football - r Football - g Football - H Football - Q Football - HH At this point, it still needs to be mapped to a master record... I've tried several different combinations of fuzzywuzzy matching methods, Levenshtein Distance measurements, regex, etc. and can't seem to find a reliable method to logically associate different naming styles of a single item with a master name. I'm throwing my hands up in desperation. Are there any existing python resources than can help sort out my problem? Are there other options? Can anybody point out an obvious option that I might have overlooked? Basically, any suggestion, solution, resource or alternative method is greatly appreciated.

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• How to refactor a method which breaks "The law of Demeter" principle?

  - by dreza

  I often find myself breaking this principle (not intentially, just through bad design). However recently I've seen a bit of code that I'm not sure of the best approach. I have a number of classes. For simplicity I've taken out the bulk of the classes methods etc public class Paddock { public SoilType Soil { get; private set; } // a whole bunch of other properties around paddock information } public class SoilType { public SoilDrainageType Drainage { get; private set; } // a whole bunch of other properties around soil types } public class SoilDrainageType { // a whole bunch of public properties that expose soil drainage values public double GetProportionOfDrainage(SoilType soil, double blockRatio) { // This method does a number of calculations using public properties // exposed off SoilType as well as the blockRatio value in some conditions } } In the code I have seen in a number of places calls like so paddock.Soil.Drainage.GetProportionOfDrainage(paddock.Soil, paddock.GetBlockRatio()); or within the block object itself in places it's Soil.Drainage.GetProportionOfDrainage(this.Soil, this.GetBlockRatio()); Upon reading this seems to break "The Law of Demeter" in that I'm chaining together these properties to access the method I want. So my thought in order to adjust this was to create public methods on SoilType and Paddock that contains wrappers i.e. on paddock it would be public class Paddock { public double GetProportionOfDrainage() { return Soil.GetProportionOfDrainage(this.GetBlockRatio()); } } on the SoilType it would be public class SoilType { public double GetProportionOfDrainage(double blockRatio) { return Drainage.GetProportionOfDrainage(this, blockRatio); } } so now calls where it used would be simply // used outside of paddock class where we can access instances of Paddock paddock.GetProportionofDrainage() or this.GetProportionOfDrainage(); // if used within Paddock class This seemed like a nice alternative. However now I have a concern over how would I enforce this usage and stop anyone else from writing code such as paddock.Soil.Drainage.GetProportionOfDrainage(paddock.Soil, paddock.GetBlockRatio()); rather than just paddock.GetProportionOfDrainage(); I need the properties to remain public at this stage as they are too ingrained in usage throughout the code block. However I don't really want a mixture of accessing the method on DrainageType directly as that seems to defeat the purpose altogether. What would be the appropiate design approach in this situation? I can provide more information as required to better help in answers. Is my thoughts on refactoring this even appropiate or should is it best to leave it as is and use the property chaining to access the method as and when required?

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• Transferring NS records to a new server

  - by lanemiller

  I feel like that was NOT worded well, but here is my current predicament. I recently had a GoDaddy dedicated server, and decided after their customer support failed to do anything but disappoint, to switch to Rackspace. We have 2 ns records that point to our godaddy server, and we have a few sites left on the server, that rely on it for their DNS zones, and the owners of the domains fail to respond to us. So, the question is, if I need to transfer the sites off of the OLD godaddy NS, can I point the A records from my ns1.domain.com and ns2.domain.com to match up with IP addresses of the Rackspace nameservers? OR, do I cname my NS records to match the rackspace ones? I DO know that this isn't advised, either method, but I need to get these sites moved before Godaddy tries charging another $2k for the server.

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• How do I set up a headless server via VNC?

  - by Joe

  I'm trying to configure my system to run headless and access the desktop via VNC when necessary. It seems everytime I unplug the monitor while ubuntu is running, the system freezes and I am forced to do a hard shut down. If I start the computer up without a monitor it won't boot up all the way and I am still unable to access the desktop through VNC. I am able to VNC to it while there is a monitor attached to it. Automatic login is enabled. I want to VNC into my ubuntu machine without a monitor.

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• Wine throwing errors since going to 13.10

  - by serilain

  After upgrading to Ubuntu 13.10, running any program in Wine produces the following errors (via CLI): wine: Unhandled page fault on read access to 0x00000000 at address (nil) (thread 000f), starting debugger... wine: Unhandled page fault on read access to 0x00000000 at address (nil) (thread 0014), starting debugger... wine client error:14: write: Bad file descriptor err:wineboot:start_services_process Unexpected termination of services.exe - exit code -1073741819 (These also generate two popup windows saying that an undefined application has crashed). After this, the program I was trying to run in the first place executes as normal. Any idea how to fix this?

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• 25 years old and considering a career change...possible? practical?

  - by mq330

  Hi all, I'm new to this site and new to programming as well. I've spent some time going through an intro cs book that uses python as the language of choice. I find the exercises interesting and engaging and I generally have had a favorable experience programming so far. I've gone through some of the basics with python like writing simple programs, basics of GUIs, manipulating strings, lists, defining functions, etc. And I've always loved technology. Although I've never done any real hardcore programming yet, I was inclined to building websites from a very young age but I never really developed my skills. Now, the thing is I'm 25, I have my bacholors in environmental studies and two masters degrees in urban planning and landscape architecture respectively. I know, it would be quite a departure to pursue a career in programming at this point. Currently, I'm working as a geographic information systems intern. I've taken some GIS classes and have a lot of experience with making maps, doing spatial analysis etc. So what I'm thinking is maybe I can learn some solid programming skills and apply these skills in the field of GIS. From what I've seen, .net languages are the norm in this arena. Could you perhaps provide some guidance to me in terms of what languages I should focus on or courses I should take at this point? What about for building web mapping applications? Also, I was thinking about getting a certificate in programming from a university extension program. Do you think it would be worth it? And furthermore, do you think potential employers would be interested in hiring someone like me (once I get a couple of languages down pretty well) as an intern or in an entry level position? I'll be living in the bay area so I feel that there should be decent opportunities even though I don't have a b.s. in cs.

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• Search engine bots accessing strange URLs

  - by casasoft

  We have ELMAH enabled on our site and get errors whenever a Page Not Found error is triggered on the website. We have recently redesigned a new website and so we understand that search engine robots might have previously indexed pages which they try to access and result in a Page Not Found errors. For this reason, we have set up permanent redirects for such previously indexed pages to the respective new pages. The website in mention is www.chambercollege.com and for example, a previously indexed URL was www.chambercollege.com/special-offers.aspx. This page is no longer accessible so we have created the necessary permanent redirect to redirect to the respective page on www.chambercollege.com/en/content/special-offers-161/. Now we are starting to receive Page Not Found errors of search engine bots (e.g. MSN bot) trying to access the URL www.chambercollege.com/special-offers.aspx/images/shadow_right.jpg/. Any idea how could a search engine make up that strange URL and whether you have any suggestions of what to do best?

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• Working with the ADF DVT Map Component

  - by Shay Shmeltzer

  The map component provided by the ADF Faces DVT set of components is one that we are always ending up using in key demos - simply because it is so nice looking, but also because it is quite simple to use. So in case you need to show some geographical data, or if you just want to impress your manager, here is a little video that shows you how to create two types of maps. The first one is a color themed map - where you show different states with different colors based on the value of some data point there. The other is a point theme - basically showing specific locations on the map. For both cases I'm using the Oracle provided mapviewer instance at http://elocation.oracle.com/mapviewer. You can find more information about using the map component in the Web User Interface Developer's Guide here and in the tag doc and components demo. For the first map the query I'm using (on the HR demo schema in the Oracle DB) is: SELECT     COUNT(EMPLOYEES.EMPLOYEE_ID) , Department_name , STATE_PROVINCE FROM     EMPLOYEES,     DEPARTMENTS,     LOCATIONS WHERE employees.department_id=departments.department_idand Departments.location_id=locations.location_idGROUP BY Department_name,    LOCATIONS.STATE_PROVINCE

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• DNS Help: Move domain, not mailserver

  - by Preserved

  I'm in the middle of launching a new website for an already-in-use domain. The domain has a complicated email system so we'd like to move that over to the new server a bit later on. Currently the domain DNS is managed by the current webhost. I plan on moving the DNS management back to Network Solutions, then point the A record to the new website's IP. However, currently the DNS has the MX record the same as the A record. When NetworkSolutions is managing the DNS, and I point the A record to the new IP, then the MX record can't be the A record.. Right now: A Record mydomain.com points to IP address 198.198.198.198 MX record mydomain.com points to IP address 198.198.198.198 What I want: A Record mydomain.com points to IP address of new server MX record somehow points to current existing mailserver Does this even make sense?

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• Initialize array in amortized constant time -- what is this trick called?

  - by user946850

  There is this data structure that trades performance of array access against the need to iterate over it when clearing it. You keep a generation counter with each entry, and also a global generation counter. The "clear" operation increases the generation counter. On each access, you compare local vs. global generation counters; if they differ, the value is treated as "clean". This has come up in this answer on Stack Overflow recently, but I don't remember if this trick has an official name. Does it? One use case is Dijkstra's algorithm if only a tiny subset of the nodes has to be relaxed, and if this has to be done repeatedly.

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• How to redirect domain to new server?

  - by hfidgen

  I've got a domain registered with a hosting company who I no longer wish to use. I'm happy for them to keep managing my domain, but I want my domain to point to my new (better) server which i've just bought and set up. I know my new server's IP address and Nameservers, What do I need to do in my domain management control panel to make it point to my new server? Change the "A" record to the new IP? Change the nameservers to my new hosts nameservers? Is that it? Are there no other record on either server which need changing? I always get confused by who needs to do what when it comes to domains... Thanks, Hugh

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• Advice and resources on collaborative environments

  - by Tjaart

  I need some advice on collaborative software environments. More specifically, I am looking for books and reference materials that can aid me in understanding team and code structures and the interactions thereof. In other words books, blogs or white papers explaining: Different strategies for structuring teams that share common code between each other but have distinct individual functions? To summarise my question I would like to know what would be a good source of knowledge if I were to set up teams in an organisation that shared code but each unit still remained autonomous. I have done some research on this subject and explored: code review tools, distributed VCS, continuous integration tools, Unit testing automation. The tough part about implementing these tools are to determine where a good place would be to start, which tools are low hanging fruit, which tools or methods provide higher success rates. If someone asks me about code quality reference I point them to Code Complete. I am looking for an equivalent guide on software team structures and tools to make this equation work better. I realise that this question is quite vague but it arose as "we need to share code between teams without breaking each others stuff and causing management headaches and reams of red tape" The answer is definitely not simple and requires changes on many levels, hence the question. If the question is too vague please vote to close or delete. I would accept any good starting point as an answer.

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• How to divide work to a network of computers?

  - by Morpork

  Imagine a scenario as follows: Lets say you have a central computer which generates a lot of data. This data must go through some processing, which unfortunately takes longer than to generate. In order for the processing to catch up with real time, we plug in more slave computers. Further, we must take into account the possibility of slaves dropping out of the network mid-job as well as additional slaves being added. The central computer should ensure that all jobs are finished to its satisfaction, and that jobs dropped by a slave are retasked to another. The main question is: What approach should I use to achieve this? But perhaps the following would help me arrive at an answer: Is there a name or design pattern to what I am trying to do? What domain of knowledge do I need to achieve the goal of getting these computers to talk to each other? (eg. will a database, which I have some knowledge of, be enough or will this involve sockets, which I have yet to have knowledge of?) Are there any examples of such a system? The main question is a bit general so it would be good to have a starting point/reference point. Note I am assuming constraints of c++ and windows so solutions pointing in that direction would be appreciated.

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• Will USMT 4.0 in MDT 2010 Move/Migrate the .NK2 File for Outlook?

  - by Mitch

  We're about to begin a refresh project for about 100 XP Pro laptops and have a concern with regards to the .NK2 file which holds cached email addresses(?). If possible we'd like to have USMT move/migrate this but I can't find anything that confirms that this happens automatically or has been done before. I see lots of manual processes but at this point I'm not sure that we can use that. Has anyone done this or seen this done? Perhaps you can point me to a resource that can give me an idea how its done? Any information would be appreciated. USMT seems to get a lot of the details but missing this part seems odd. Thanks in advance for any responses.

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