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• Recent resources on Entity Framework 4

  - by Eric Nelson

  I just posted on the bits you need to install to explore all the features of Entity Framework 4 with the Visual Studio 2010 RC. I’ve also had a quick look (March 12th 2010) to see what new resources are out there on EF4. They appear a little thin on the ground – but there are some gems. The following all caught my attention: Julie Lerman has published 2 How-to-videos on EF4 on pluralsight.com. You need to create a free guest pass to watch them. Getting Started with Entity Framework 4.0 – Session given at Cairo CodeCamp 2010 . This includes ppt and demos. Entity Framework 4 providers – read through the comments What’s new with Entity Framework in Visual Studio 2010 RC Extending the design surface of EF4 using the Extension Starter Kit Persistence Ignorance and EF4 on geekSpeak on channel 9 (poor audio IMHO – I gave up) First of a series of posts on EF4 How to stop your dba having a heart attack with EF4 from Simon Sabin in the UK. This includes ppt and demos. And the biggy. You no longer have to depend on SQL Profiler to keep an eye on the generated SQL. There is now a commercial profiler for Entity Framework.  I am yet to try it – but I listened to a .NET rocks podcast which made it sound great. It is “hidden” in a session on DSLs in Boo –> Oren Eini on creating DSLs in Boo. This is a much richer experience than you would get from SQL Profiler – matching the SQL to the .NET code. And finally a momentous #fail to … drum roll… the Visual Studio 2010 and .NET Framework 4 Training Kit Feb release. This just contains one ppt on EF4 – and it is not even a good one. Real shame. P.S. I will update the 101 EF4 Resources with the above … but post devweek in case I find some more goodies. Related Links 101 EF4 Resources

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• Tips for debugging Samba performance?

  - by j-g-faustus

  Samba gives me 24 MB/s read and 44 MB/s write, while ftp gives 97 and 112 MB/s under the same circumstances. The documentation says that Generally, you should find that Samba performs similarly to ftp at raw transfer speed. In my case it clearly doesn't. Where can I find tips on how to debug Samba performance? Or alternatively tips for replacing Samba with something else? (I can't use ftp, unfortunately, as I need something that can be used with rsync/rsnapshot.) More details: Both computers are running Ubuntu 10.10 (using Samba because I have a Mac as well) The Samba share is on a local home network, mounted as $ mount ... //server.local/share/ on /mnt/share type cifs (rw,mand) Samba performance was tested by copying (cp) a single file of ~4GB to and from the share, using time for timing and calculating transfer speed by hand. ftp performance are the numbers from the ftp client for get/put of the same file. iperf gives network speed ~900 Mbits/s bonnie++ gives disk speeds 200 MB/s on both sides for block reads as well as block writes Tried changing the parameters suggested in the performance tuning HOWTO (read/write raw, read size, socket options), most of them made little to no difference. (The one that made a difference caused write speed to drop 50%.)

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• LinkedIn Woopsie with the Outlook 2010 Social Media Connector

  - by Martin Hinshelwood

  I have always used the LinkedIn toolbar for Outlook to sort out, upload and sync my contacts. Because of this I have over 2000 contacts in my contacts list that I sync with my phone, Plaxo, live, Google and others. I got a surprise the other day when my LinkedIn account was suspended and I was unable to login.   Figure: Bad, account suspended   So I contacted LinkedIn customer services to find out what the problem is, and here is the response: Dear Martin, We have recently noticed a large number of page searches and profile views through your LinkedIn account. We are aware that you may be using an automated or manual process to systematically view LinkedIn web pages. The information within LinkedIn is provided by our users for usage on the site only. In order to protect user privacy, our User Agreement prohibits using: 1. Automated or manual means to view an excessively high number of profiles or mini-profiles. 2. Automated means to run searches to collect or store data obtained from our site. We have placed a restriction on your account until you agree to stop using these or similar methods to view pages on LinkedIn. We look forward to your reply to discuss this further. Sincerely, LinkedIn Privacy Team It looks like LinkedIn has suspended my account because of something that their component is doing! I do not know if this is an isolated case, or if it will happen more as more users get on Outlook 2010 and update to the new software, but watch out. Has anyone else been suspended who has installed the Office 2010 RTM and the LinkedIn Add-On? Technorati Tags: Fail,LinkedIn,Outlook 2010

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• Ubuntu: Take actions when system temperature gets too high

  - by Josh

  One of the CPU fans on my Compaq Presario laptop running Ubuntu 9.10 seems to have bit the dust. The fan is deep within the case and I intend to replace the laptop in the next 6 months so it's not worth replacing it. I have the laptop on a cooling pad and most of the time the system is fine, CPU temps around 90°-110°F. Occasionally, however, I'm seeing random lockups which I believe is due to the system overheating. How can I configure the system to: Lower the CPU speed when the temperature reaches a certain level? (I.E. 110°F) Shutdown the system when the tempature reaches a critical level? (And what would that be? 130°?)

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• Run one virtual machine on a Linux server + standard Linux functions

  - by fistameeny

  Hi, I am looking for a method to setup a Linux server (running Ubuntu Server) that uses Samba for file sharing, as well as hosting a Windows virtual machine (in this case, Windows Small Business Server 2003, which in turn hosts SQL Server Express - Exchange won't be used on this). I would like to have the Linux server serving the files over Samba, and hosting the Virtual Machine. This obviously rules ESXi out as it couldn't do Samba at the same time. What would be the next best solution to give reasonable speed? Vmware Server 2.0, VirtualBox, Xen? There will be 10-15 users accessing the Samba shares and the SQL Express virtual machine. Matt

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• Advantages of Singleton Class over Static Class?

  Point 1)Singleton We can get the object of singleton and then pass to other methods.Static Class We can not pass static class to other methods as we pass objectsPoint 2) Singleton In future, it is easy to change the logic of of creating objects to some pooling mechanism. Static Class Very difficult to implement some pooling logic in case of static class. We would need to make that class as non-static and then make all the methods non-static methods, So entire your code needs to be changed.Point3:) Singleton Can Singletone class be inherited to subclass? Singleton class does not say any restriction of Inheritence. So we should be able to do this as long as subclass is also inheritence.There's nothing fundamentally wrong with subclassing a class that is intended to be a singleton. There are many reasons you might want to do it. and there are many ways to accomplish it. It depends on language you use.Static Class We can not inherit Static class to another Static class in C#. Think about it this way: you access static members via type name, like this: MyStaticType.MyStaticMember(); Were you to inherit from that class, you would have to access it via the new type name: MyNewType.MyStaticMember(); Thus, the new item bears no relationships to the original when used in code. There would be no way to take advantage of any inheritance relationship for things like polymorphism. span.fullpost {display:none;}

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• What build tools do not depend on java (or Ruby)?

  - by Mohamed Meligy

  I'm wondering what generic build tools out there include their binary run-times and do not depend on another environment not shipped with them. For example, ANT requires Java, Rake requires Ruby, etc.. would be great if talking about also target-platform-agnostic tools, where I'd just give whatever command for building, whatever command for testing, etc.. and can then define my artifacts in CI or so. Would see something like that useful for building .NET projects (say, on both Windows .NET and Mono), and Node JS projects especially. I do not want to install Java and / or Ruby if what I want is a .NET build or a Node JS build. This is a bit of general awareness question not an exact problem I'm facing, that's why it's here not on StackOverflow. Update: To explain a bit more, what I'm after is the build script that would run MSBuild for compiling for example ( in .NET, and then maybe several Node/NPM commands in Node, etc..), and then have the rest build/test steps, instead of setting these all in MSBuild (again, in .NET case, also, wondering if there is equivalent story in Node).

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• Ubuntu issues when moving hard disk to new system

  - by Tim

  I'm working on a legacy project with a small single board computer running Ubuntu 10.04 on a compact flash card. I need to be able to save away a working image (via dd) and copy said image to other compact flash cards for use in other single board computers (with identical hardware) I'm able to copy the image to other flash cards and bootup on other systems no problem. But I'm seeing strange behavior. For instance, I can't use sudo on the new system (“sudo: must be setuid root”). I've gone down the path of trying to fix this, but have run into a slew of other issues. General question is: what do I need to be aware of when moving a hard disk containing Ubuntu (in my case a compact flash card) to another computer? I was hoping it would be seamless to Ubuntu since it's moving to a system with identical hardware. Is there something that needs to be done to make it "portable"?

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• How to advocate Stack Overflow at work

  - by Gordon

  I am thinking of doing a short presentation at work about using Stack Overflow as a resource for your day job. What is the experience doing this? Would you deem it a valid resource to tell you colleagues about or is it similar to telling them about Google as a resource? Is there a better way of doing it? I was leaning toward asking questions side of Stack Overflow rather than answering them to avoid you-shouldn't-be-doing-this-on-work-time argument. Just as a follow up. Originally I didn't want to make the question to specific to my own case. My presentation will only be a quick four minute talk, which I will repeat over an hour to different groups. I may ask a question before the talk on Stack Overflow and refer to it during the presentation. Hopefully I will get some activity during the hour. I am also going to talk briefly about some of the other Stack Exchange sites that would fit the audience as they are not all developers. I think Super User, Server Fault and Programmers should work well. I will not be doing the presentation for another couple of months as it has be rescheduled, but I will update on how I got on.

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• Impossible installing Ubuntu 13.04 in UEFI mode with Windows 8 preinstalled

  - by Lautaro Vergara

  I know this is a dejavu but let me please explain my problem. When booting 13.04 installation media EFI mode get to a black screen with Grub version 2.00-l3ubuntu3 version appears after selecting "install" or "try Ubuntu", there appear error messages: - failure reading sector ... from 'cd0' - you need to load the kernel first I have a Dell Vostro 3560 with Windows 8. I have downloaded and burned ubuntu-13.04-desktop-amd64.iso. Hashes checked. I've booted from the dvd with Secure Boot enabled. The same happens when Secure Boot is disable. When booting with Legacy BIOS, installation starts. I tried Ubuntu without installing and looks OK. BUT, I did not follow the installation because in https://help.ubuntu.com/community/UEFI#Converting_Ubuntu_into_EFI_mode there appears "if the other systems (Windows Vista/7/8, GNU/Linux...) of your computer are installed in EFI mode, then you must install Ubuntu in EFI mode too.", which is the case in my computer. I have read many similar questions and the corresponding answers from people in this forum, but till now I haven't found a solution. Could someone help me on this subject? Thanks in advance!

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• Straight cable or cross over cable?

  - by om sai

  I have pppoe internet connection. My ISP provides connections like this: ISP->media converter(fiber)->8 port switch(TP Link TL-SF1008D)->to individual internet connection account holders (like me) Now the connection between the media converter and the switch is done using 4 pair cross over cat5 cable and I would like to connect the cable running from the switch to the router and through router to my PC. So what type of cable should I use to make the connection between the switch and the router (straight thru cable or cross over cable)? The point I am trying to make is I am able to connect to the internet using straight through cable between the switch and my PC but when I connect the same cable between the switch and the router and from router to my PC I am not able to connect to the internet. Also, if I am using the 2 pair cable (instead of 4) between the switch and the router I am able to connect to the internet but same is not true in case of 4 pair cat5 cable.

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• Difference between Detach/Attach and Restore/BackUp a DB

  - by SAMIR BHOGAYTA

  Transact-SQL BACKUP/RESTORE is the normal method for database backup and recovery. Databases can be backed up while online. The backup file size is usually smaller than the database files since only used pages are backed up. Also, in the FULL or BULK_LOGGED recovery model, you can reduce potential data loss by performing transaction log backups. Detaching a database removes the database from SQL Server while leaving the physical database files intact. This allows you to rename or move the physical files and then re-attach. Although one could perform cold backups using this technique, detach/attach isn't really intended to be used as a backup/recovery process. Commonly it is recommended that you use BACKUP/RESTORE for disaster recovery (DR) scenario and copying data from one location to another. But this is not absolute, sometimes for a very large database, if you want to move it from one location to another, backup/restore process may spend a lot of time which you do not like, in this case, detaching/attaching a database is a better way since you can attach a workable database very fast. But you need to aware that detaching a database will bring it offline for a short time and detaching/attaching does not provide DR function. For more information about detaching and attaching databases, you can refer to: Detaching and Attaching Databases http://technet.microsoft.com/en-us/library/ms190794.aspx

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• Windows file compare (FC) spurious differences

  - by user165568

  I'm getting differences like this: a.txt Betty Davis Cathy Edwards b.txt Betty Davis Cathy Edwards There are only two lines listed in the diff (which doesn't make sense). No CR/LF/Newline funnies. The difference just moves down if I delete lines. Same problem on Win7 and Win2K. The difference seems to go away if I remove all empty lines from the files. The empty lines are correctly terminiated too. Using /C /W (ignore case, ignore whitespace) Has anyone seen this before? What am I doing wrong? How can I fix it? There are real diffs in the file -missing, extra, or re-spelled names- but the files are byte-for-byte identical at the listed diff.

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• Wolfram is out, any alternatives? Or how to go custom?

  - by Patrick

  We were originally planning on using wolfram alpha api for a new project but unfortunately the cost was entirely way to high for what we were using it for. Essentially what we were doing is calculating the nutrition facts for food. (http://www.wolframalpha.com/input/?i=chicken+breast+with+broccoli). Before taking the step of trying to build something that may work in its place for this use case is there any open source code anywhere that can do this kind of analysis and compile the data? The hardest part in my opinion is what it has for assumptions and where it gets that data to power the calculations. Or another way to put it is, I cannot seem to wrap my head around building something that computes user input to return facts and knowledge. I know if I can convert the user input into some standardized form I can then compare that to a nutrition fact database to pull in the information I need. Does anyone know of any solutions to re-create this or APIs that can provide this kind of analysis? Thanks for any advice. I am trying to figure out if this project is dead in the water before it even starts. This kind of programming is well beyond me so I can only hope for an API, open source, or some kind of analysis engine to interpret user input when I know what kind of data they are entering (measurements and food).

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• Why should I use Zend_Application?

  - by Billy ONeal

  I've been working on a Zend Framework application which currently does a bunch of things through Zend Application and a few resource plugins written for it. However, looking at this codebase now, it seems to me that using Zend_Application just makes things more complicated; and a plain, more "traditional" bootstrap file would do a better job of being transparent. This is even more the case because the individual components of Zend -- Zend_Controller, Zend_Navigation, etc. -- don't reference Zend_Application at all. Therefore they do things like "Well just call setRoute and be on your way," and the user is left scratching their head as to how to implement that in terms of the application.ini configuration file. This is not to say that one can't figure out what's going on by doing spelunking through the ZF source code. My problem with that approach is that it's to easy to depend on something that's an implementation detail, rather than a contract, and that all it seems to do is add an extra layer of indirection that one must wade through to understand an application. I look at pre ZF 1.8 example code, before Zend_Application existed, and everywhere I see plain bootstrap files that setup the MVC framework and get on their way. The code is clear and easy to understand, even if it is a bit repetitive. I like the DRY concept that Application gets you, but particularly when I'm assuming first people looking at the app's code aren't really familiar with Zend at all, I'm considering blowing away any dependence I have on Zend_Application and returning to a traditional bootstrap file. Now, my concern here is that I don't have much experience doing this, and I don't want to get rid of Zend_Application if it does something particularly important of which I am unaware, or something of that nature. Is there a really good reason I should keep it around?

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• Running CRON job on Ubuntu server for SugarCRM

  - by Logik

  I am pretty inexperienced in Linux, so be descriptive on your answer. My environment: Local Linux server 12.04 hosting Sugar CRM 6.5.2. There is area in sugar CRM called scheduler. I can configured some predefined jobs here. in my case i am trying to run email reminders (ever min/hour/day/month). For this scheduler to be effective, i read some where i need to setup CRON job. So I did some research & finally put following lines in CRONTAB for the root user, as per instructions given in sugarCRM. * * * * * cd /var/www/crm; php -f cron.php > /dev/null 2>&1 Well I am creating contracts in my sugarCRM (AOS module) & I want email reminders to be sent for these contracts to the concern person. Now my sugarCRM email is configured correctly & I can send test emails using it. But the CRON + scheduler not giving any result. I can't receive any emails. Then I tried to read /var/log/syslog & it is showing entry for following line each minute. Oct 27 15:03:01 unicomm CRON[28182]: (root) CMD (cd /var/www/crm; php -f cron.php /dev/null 2&1) I've few questions: what does the CRON job line i've added in crontab mean? cd /var/www/crm; php -f cron.php > /dev/null 2>&1 is not making any sense to me. How am i suppose to get this thing work? I've searched a lot (including SugarCRM forum), but no luck.

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• REST and redirecting the response

  - by Duane Gran

  I'm developing a RESTful service. Here is a map of the current feature set: POST /api/document/file.jpg (creates the resource) GET /api/document/file.jpg (retrieves the resource) DELETE /api/document/file.jpg (removes the resource) So far, it does everything you might expect. I have a particular use case where I need to set up the browser to send a POST request using the multipart/form-data encoding for the document upload but when it is completed I want to redirect them back to the form. I know how to do a redirect, but I'm not certain about how the client and server should negotiate this behavior. Two approaches I'm considering: On the server check for the multipart/form-data encoding and, if present, redirect to the referrer when the request is complete. Add a service URI of /api/document/file.jpg/redirect to redirect to the referrer when the request is complete. I looked into setting an X header (X-myapp-redirect) but you can't tell the browser which headers to use like this. I manage the code for both the client and the server side so I'm flexible on solutions here. Is there a best practice to follow here?

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• Has there been a Firefox update recently?

  - by Rob Nicholson

  Trying again to ask a PROGRAMMING question because of the over-zealous closing off of what is equally a programming question before allowing the poster to clarify. The latest version of Firefox (v3.6.3) is breaking websites, mine included. I make heavy use of the Infragistic NetAdvantage controls. These, because of their heavy JavaScript reliance and occasional lack of quality control, tend to suffer through browser updates sometimes requiring a hotfix. So the question is... has there been a Firefox release recently that has either introduced a bug, tightening up of some standard, bug fix which might have broken a previous workaround (often the case) etc? I'm guessing around JavaScript but that's a guess hence the reason for asking a group of programmers...

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• Is it possible to shutdown a remote computer running Windows 7 via Telnet?

  - by Ryan Shripat

  I've successfully connected to my Windows 7 desktop over wifi via Telnet from an XP Home netbook. To login, I use the following command: telnet -l "win7desktop\win7user" win7desktop win7user in this case is an Administrator on win7desktop and is also a member of the Telnet Clients Group. The problem I have is that when I attempt to shut down win7desktop by issuing the following command: shutdown /s ...at the Telnet prompt, I get an Access Denied error: Access is denied.(5) Is it possible to shutdown a remote computer running Windows 7 via Telnet? If so, what do I need to do to get around the Access is denied error?

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• What is a Linux device name for RAID of sas drives?

  - by flashnik

  I have a RAID1 using Promise FastTrack TX2650 consisting of 2 SAS drives. What is a Linux device name for them? Like sda is for first sata drive. I have Windows server so I can't look it directly but need this information for smartctl usage. UPDATE. I found how to access RAID: smartctl -d scsi sdb (because I also have a SATA drive). But in this case I just get an information about just raid controller though I wantto get information about drives itself. Is it possible? Promises's control panel provides information only about their healthy status (boolean) and I want more. Mostly now I need information about temperature.

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• Skipping hardlinks when using TSM Backup

  - by Lars Haugseth

  We need to backup a filesystem with lots of hardlinks. Since there are several hardlinks for each "true" file, we would like to skip all the hardlinks when backing up the filesystem to avoid n exact copies of each file. The backup is done using Tivoli Storage Manager Backup, and we've been unable to get it to treat hardlinks as anything other than separate files to be backed up alongside each other. In case it's relevant for possible solutions, I'd like to note that it's possible to tell a hardlink from a proper file by the filename: foobarbaz-123.ext # file foobarbaz-123-1.ext # hardlink foobarbaz-123-2.ext # hardlink barbazfoo-456.ext # file barbazfoo-456-1.ext # hardlink barbazfoo-456-2.ext # hardlink barbazfoo-456-3.ext # hardlink That is, all hardlinks have two hyphens in the filename, where as proper files have just the one. The server is running Ubuntu Linux, and the files are situated on a gfs volume on our SAN.

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• How to structure an application that combines WCF and WPF

  - by CiaranG

  I'm in the process of learning how to use WCF (Windows Communication Foundation) to allow a client/server desktop application to communicate. The application's UI will be implemented using WPF, and we will probably use SQL Server for our database. What I'm struggling with, is understanding how to structure such an application. From what I've read, there are three components of a WCF application (which in the examples I've seen have existed as separate projects): A WCF service A WCF service host A WCF service client My question then, is - should these projects solely implement the functionality of sending/receiving data from the client/server? Would it make better sense this way? Would it make sense to create a separate WPF (Windows Presentation Foundation) project to implement the UI for the application? And so, when I need to send/receive data from the client/server, I could simply invoke the operations provided in the WCF projects that I have created? For anyone who has built similar applications previously, perhaps you could explain what worked best for you in terms of structuring your application? For example, if I create a user registration page. When the user clicks the 'Register' button, the client application will need to send the data to the server. In this case, could I just invoke the methods provided in the WCF projects to send the data? Also, what data structures worked best for you when sending/receiving data? My initial thought is sending/receiving XML containing the data. Is this an option that is easy to implement? I realise that answers to this question may well be a matter of opinion - unless there are specific best practices that I'm not aware of. Thank you

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• Fedora 17 - Can't access remote machine using hostname

  - by Aaron

  I am using Fedora 17 and am trying to access a remote machine (running Fedora 15) using its hostname which isn't working. The machine is right next to me on the same switch as my machine (so they are both on the same network with the same subnet and everything). When I was running Windows (7 32-bit) on my machine I could access the other machine no problem but now that I am running Fedora 17 that's not the case. Is there an additional daemon or something that I need to be using in order for this to work?

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• Building computer: Casing for peripheral sockets is a pain!

  - by burnt1ce

  I have a casing the covers the spacing between the peripheral socket which is standard to have when you buy a motherboard. My problem with these covers is that they have spokes that pushes the motherboard away so the sockets don't even come out of the covers. This also misaligns the screws on my atx motherboard with the holes in my computer case. I usually break these spokes so that i can align my motherboard correctly. Why the heck do motherboard manufacture put spokes on these covers? am i using them wrong? UPDATE Here's an image that i found that shows the plastic casing. http://z.about.com/d/pcsupport/1/5/m/-/-/-/tour%5Fexternal.jpg You can even see the indentation that makes the spokes that pushes the motherboard inwards.

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• Installed on a machine with EFI and after installation, it says the disk is not bootable

  - by Roy Hocknull

  I installed Ubuntu 11.10 and the installation runs through fine. It then says reboot, and the machine says 'inserts a boot disk' which means the hard disk isn't bootable. The primary hard disk is an EFI device, and nothing seems to work. The machine in question is an Acer Aspire M3970 desktop. Core i5 2300, with 8Gb Ram. Main boot drive is an SSD (Vertex 2E 60Gb). I am trying to install the 11.10 x64 version. The installation I have tried from CD and USB stick. It goes through the install, allows you to partition the drives then installs all the packages. At the end it goes for a reboot, and asks you to remove the installation media. The PC then restarts and says no bootable disk. I tried it many times. In the end I have installed Fedora 15 x64 which works straight away with no messing. Unless this issues is fixed I have to drop 11.10 as a viable option. From my experience F15 isn't quite as polished as Ubuntu, but in this case - it works!! Is this a widespread problem or am I unique?

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