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• My Inbox: How to save changes coming from disconnected POCOs

  I receive a lot of random emails from developers with Entity Framework questions. (This is not a request for more! :)) If I’m too busy to even look or if it’s something I can’t answer off the top of my head, I swallow my pride and ask the person to try the MSDN forums. If the email is from a complete stranger and has gobs and gobs of code that email will surely get a "please try MSDN forums" reply.  But sometimes I’m not in my usual state of “too...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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• Could it be more efficient for systems in general to do away with Stacks and just use Heap for memory management?

  - by Dark Templar

  It seems to me that everything that can be done with a stack can be done with the heap, but not everything that can be done with the heap can be done with the stack. Is that correct? Then for simplicity's sake, and even if we do lose a little amount of performance with certain workloads, couldn't it be better to just go with one standard (ie, the heap)? Think of the trade-off between modularity and performance. I know that isn't the best way to describe this scenario, but in general it seems that simplicity of understanding and design could be a better option even if there is a potential for better performance.

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• win rt game project to android [closed]

  - by Inderjeet

  I have develop game on windows for winrt in visual studio using cocos2d-x,i just want to port it to android in c++ in the guidance of http://www.jesusbosch.com/2012/06/how-to-set-up-android-and-win32-cocos2d.html this,but i get error while compilling the code on cygwin that errors are below CYGWIN environment variable option "nodosfilewarning" turns off this warning. Consult the user's guide for more details about POSIX paths: http://cygwin.com/cygwin-ug-net/using.html#using-pathnames ERROR: Your GNUMAKE variable is defined to an invalid name: /usr/bin/make Please fix it to point to a valid make executable (e.g. /usr/bin/make) i have install many times cygwin but did not have get make.exe in folder c:/cygwin/usr/bin how can i overcome from this error Thanks Inderjeet Kumar

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• How to display time in the top panel?

  - by Mörre

  I thought I already had the time up there in the top bar, and it may have been so in previous Ubuntu versions (don't remember, my Ubuntu laptop is just one of three computers I use). Only that I just noticed - me being someone who never wears a watch, has the cellphone turned off 95% of the time and relying on the computer to tell the time - that there is no time being displayed anywhere, and I had expected it in the top bar on the Unity desktop. I searched around but found no obvious solution, but I'm sure someone immediately knows how I can get my time (back?) into the top bar?

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• updating to 3.0.0-18-generic linux kernel is causing system instability - and no backwords compatability

  - by Gaurav_Java

  I was prompted for an update of kernel 3.0.0-18-generic, so I upgraded and rebooted my system now its behaving really strange. Applications are crashing . System is randomly restarting Files are randomly disappearing off of my desktop I've tried booting into Linux kernel 3.0.0-17-generic but it doesn't help. Subsequently I am not able to connect to the INTERNET when I use the 3.0.0-17-generic kernel. Are there any ideas on what may be wrong? How I can go about debugging this?

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• How can I compute the Big-O notation for a given piece of code?

  - by TheNew Rob Mullins

  So I just took a data structure midterm today and I was asked to determine the run time, in Big O notation, of the following nested loop: for (int i = 0; i < n-1; i++) { for(int j = 0; j < i; j++2) { //1 Statement } } I'm having trouble understanding the formula behind determining the run time. I thought that since the inner loop has 1 statement, and using the series equation of: (n * (n - 1)) / 2, I figured it to be: 1n * (n-1) / 2. Thus equaling (n^2 - 1) / 2. And so I generalized the runtime to be O(n^2 / 2). I'm not sure this is right though haha, was I supposed to divide my answer again by 2 since j is being upped in intervals of 2? Or is my answer completely off?

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• 12.04 reboots rather than shutting down

  - by Luca

  I have a ruvo with a fresh installation of 12.04. When I try and shutdown the computer reboots. Until I upgraded (by doing a fresh install) I ran it with Ubuntu 10.04 and I didn't have this issue. I have tried sudo shutdown -h now sudo shutdown -P now sudo init 0 sudo poweroff All of these cause a reboot. I have added acpi=norq to my grub file as suggested by someone in the first post below. This is being used as a mythtv frontend and I would like the power button to shut it down. I have modified the button to perform a shutdown -h now, but this too causes a reboot. I have studied the posts below and tried some of these ideas, but with no luck so far. Why do I get a reboot instead of a shutdown? Ubuntu 12.04 not shutting down properly Stuck on reboot and shutdown Shutdown does not power off computer

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• Ubuntu 10.10 booting but not rebooting from external USB hard drive, what could be the problem?

  - by user8276

  I have a Dell Inspiron 6400 laptop with a dead internal hard drive controller. It boots perfectly from CD or USB. I therefore removed the internal hard drive and installed Ubuntu 10.10 Maverick onto an external USB hard drive. It boots and runs perfectly when doing a "cold start" of the PC. However, when I choose restart/reboot in the Ubuntu menu (e.g. after an update), I get this error message from the BIOS: "No bootable devices, strike f1 to retry boot, f2 for setup utility, press f5 to run onboard diagnostics". I can make the system boot again by pressing f2 or f5 and exiting the utility without having done anything. Or, I can simply power off the system and do a new "cold start". Does anyone know the likely reason for this problem and how to fix it. It is not a big issue but an annoyance that I would like to fix if possible.

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• How do you hibernate/suspend Ubuntu like Windows or both at the same time?

  - by All Star Geek

  I'm using an ASUS laptop with Windows 7, and I just installed Ubuntu alongside Windows yesterday, using the no-risk option. I noticed, though, that I can't hibernate Ubuntu the way I did with Windows to save time, and, every time I use Ubuntu, I have to shut down to go into Windows, which has a slow boot. Is there any way that I could have Windows and Ubuntu hibernated at the same time so I can access both easily (preferably without having to hit a function key within seconds). When I try to hibernate or suspend Ubuntu with Windows shut down, the screen just turns blue and doesn't shut the computer off like a Windows hibernate or sleep.

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• Programming in R help

  - by mary

  I needed help in converting the temperature from Farenheit to Celsius. Below are several attempts and each of these fails. I have ran the following below and need help in saying what error message is created by: a) (temp -32) Can you please let me know the error message in a comment, and what it means and how to directly relate the wording of the error message with the problem you find in the expression. likewise for: b) (temp - 32)5/9 don't know the erorr on this one c) 5/9(temp - 32) need an asterisk, but not specific enough d) [temp - 32]5/9 I know braces is off.

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• SQL in the City - Seattle 2012

  Start the week in Seattle off with a free day of training on Nov 5, 2012 with SQL in the City. Grant Fritchey, Steve Jones and more will be talking SQL Server in the Pacific Northwest. Join us and debate and discuss SQL Server the Red Gate Way. Are you sure you can restore your backups? Run full restore + DBCC CHECKDB quickly and easily with SQL Backup Pro's new automated verification. Check for corruption and prepare for when disaster strikes. Try it now.

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• How can I rewrite a subdomain to go to a specific file in a specific folder?

  - by FasterHorses

  I've done searching for my answer and have tested a few solutions, but nothing has worked so far. I'm trying to get a URL like this: http://baseball.sports.com to rewrite to... http://pro.sports.com/baseball-index.php However, I still need to keep the domain the same (http://baseball.sports.com). The reason being I have about 5 subdomains (baseball, football, soccer, etc) that I want to run off the same code base (pro.sports.com). Everything is on the same server. I'd be happy to answer any other questions that would help me get a resolution. I truly appreciate any direction that can be given to me to solve this. Thanks! --Nick

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• Inserting x200s into (ultrabase) docking station mirror screen is always activated leading to non optimal resolution

  - by kiu

  Builtin LCD should be 1440x900 External LCD should be 1920x1080 If X200s is inserted into docking station the option mirror screen is always activated leading to a resolution of 1152x864 which looks terrible on the builtin and external lcd. My manual configuration for docking mode (seperate screens with maximum resolution) should be respected, but "Make Default" button has no consequences. Found a quick fix, but this cant be the offical ubuntu way... /etc/udev/rules.d/99-vga.rules: SUBSYSTEM=="drm", ACTION=="change", RUN+="/usr/local/sbin/vga_changed.sh" /usr/local/sbin/vga_changed.sh: #!/bin/bash dmode="$(cat /sys/class/drm/card0-VGA-1/status)" export DISPLAY=:0.0 if [ "${dmode}" = disconnected ]; then /usr/bin/sudo -u kiu /usr/bin/xrandr --output LVDS1 --mode 1440x900 --pos 0x0 --output VGA1 --off elif [ "${dmode}" = connected ]; then /usr/bin/sudo -u kiu /usr/bin/xrandr --output LVDS1 --mode 1440x900 --pos 0x0 --output VGA1 --auto --mode 1920x1080 --right-of LVDS1 fi

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• Advise on effectively re-entering CPP world [closed]

  - by Aadith

  I am getting back into C++ world after nearly a decade. Apparently, there has been a world of development. Would like to get the developer community's advice as to what would be a good approach to have a smooth take-off. To start with, I have done the following: Read up (very briefly) on C++ 11 standards Installed GCC 4.7 Wrote a Hello World program I am sure getting a decent book and reading through it would do. But I am looking for any strategic advise experts might have to share. Trying to leverage on past experience to have a short but effective initial learning span. What would be top few things I would have to look into?

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• Handle php out of memory error

  - by PeterMmm

  I have a Drupal based web site on a relative small vserver (512MB RAM). Recently the website begins to return php out of memory messages like this: Fatal error: Out of memory (allocated 17039360) (tried to allocate 77824 bytes) in /home/... All php.ini memory limit parameters are set to off (-1). Propably the website has gained of complexity, content, etc. But I cannot interpret fine that message: Does that mean that the whole request has allocated 17MB(?) right now and cannot get 7MB(?) more from the OS. Has the web server spend all memory or has the OS no more memory to allocate ? I'm not shure if the memory overhead is coming from the web server or another service, because when I get the out-of-memoy message I can't get into the server with ssh. After a while all runs fine again.

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• Is sudo dd taking too long to wipe hard drive?

  - by Adam133718

  I have a 200gb HDD which I removed from a macbook due to several corrupt files in startup. One thing led to another and I decided that I needed to format the drive. I used the command sudo dd if=/dev/zero of=/dev/sdb which is supposed to wipe everything off of the hard drive. It is my understanding that the command writes 0's over every bit on the drive, which I would imagine must take a while. The process has been going for about 18 hours now. I can use other functions of operating system like the web browser and I can even use another terminal window, so I know the system is not frozen. Should I restart the process or let it continue on? Any advice will help. Thanks. By the way, I already noticed a post similar to this that was previously answered though the user was not using the same command as I was.

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• Optimize bootup sequence

  - by ubuntudroid

  I'm on Ubuntu 11.04 (upgraded from 10.10) and suffering really high bootup times. It got so annoying, that I decided to dive into bootchart analysis myself. Therefore I installed bootchart and restarted the system which generated this chart. However, I'm not really experienced in reading such stuff. What causes the long bootup sequence? Edit: Here is the output of hdparm -i /dev/sda: /dev/sda: Model=SAMSUNG HD501LJ, FwRev=CR100-12, SerialNo=S0MUJ1EQ102621 Config={ Fixed } RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4 BuffType=DualPortCache, BuffSize=16384kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 AdvancedPM=no WriteCache=enabled Drive conforms to: unknown: ATA/ATAPI-3,4,5,6,7 * signifies the current active mode And here the output of hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2410 MB in 2.00 seconds = 1205.26 MB/sec Timing buffered disk reads: 258 MB in 3.02 seconds = 85.50 MB/sec

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• secure boot windows 8 issues it hates ubuntu :(

  - by Steven Brown

  im running into issues with windows 8. ok so i disabled secure boot from my laptop. i tell it to launch from my USB with ubuntu installed on it and it wont boot. just simply light my screen and darken it. iv google the fire out of this and no use so im asking for help. im useing ubuntu 13.04. more details: well i have tryed to boot another OS (zorin) and it hates it too. i dont know why my secure boot wont shut off. if it helps i have a HP 2000.

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• Installed nvidia graphics driver (current, 8800GTX) has issues, how do I disable/uninstall it?

  - by Craig

  I installed the restricted nvidia graphics driver (current) on my computer, then restarted to finish the install. Upon reboot I got some prompt about there being an X server problem, It told me to try auto-fixing or something, none of its options worked, they all failed horribly and caused the computer to crash immediately on selecting any of them. I decided to re-install. Again I got in, downloaded updates, and installed the driver. This time upon boot the X-server immediately crashes and im brought to tty1. If I hit ctrl+alt+F7 I see a beige-background prompt says the usual about checking battery state, pulse audio etc., you see right before the x-server starts. According to X (if I do sudo startx) there are no displays, and the nvidia graphics driver is not working. First off, how do I set ubuntu back to the default driver (I have only a CLI right now -.-), then how do I install a more appropriate nvidia driver

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• How to create this drop down box [migrated]

  - by mystycs

  I am trying to create this dropdown box that slides down and has the bottom image retain as it slides down withc ontent inside it. I have beent rying to find scripts dedicated to this but i cant find any. Maybe someone can give me a headstart or pointer in doing this. Or has a script i can work off of? Here is my objective. To create a slide down menu that slides down and up on click but retains this look to it.

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• How to force GNOME panels et. al. to display on a different monitor without mirroring?

  - by GrueKun

  So, I recently purchased a new 23" monitor for my PC. However, I can't use it with the PC currently as I am waiting on a replacement heatsink. In the mean time, I wanted to use it with my Dell laptop. I hooked it up to the VGA port, and it seems to be working properly. However, I wanted to know if there was a way I could move all of the main display elements over to the attached monitor? I wanted to shut the LCD panel off on the laptop and hook it up like a desktop. Relevant specs: Ubuntu 10.10 x64 Intel graphics chipset The attached monitor is currently set as the default monitor. Any suggestions are welcome. :)

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• HTML5 apps

  Right now nobody’s interested in a mobile solution that does not contain the words “iPhone” and “app” and that is not submitted to a closed environment where it competes with approximately 2,437 similar mobile solutions.Compared to the current crop of mobile clients and developers, lemmings marching off a cliff follow a solid, sensible strategy. Startling them out of this obsession requires nothing short of a new buzzword.Therefore I’d like to re-brand standards-based mobile websites and applications,...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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• Will the world depend less of developers?

  - by nmiranda

  Hi everybody, yesterday I had a little chat with a friend that is in the field of development as I am. And he told me that he planned to change of business, I mean, he wants to get off developing cause he doesn't think that it has future. "There will come days were you could have a job as a developer but you would never get rich" he said. "Nowadays is more important to have an idea and develop it in a product than being a software developer. Today you can find a lot of applications that can help you to make it. We have already non-sql databases, better cases than 10 years ago and other tools much of them free, everything is directed to depend less of developers and you'll see it more 10 years from now" Do you agree with that?

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• Trying to install/dual boot

  - by user292236

  I have widows 8 (Pre-installed), and I was not a fan. So I thought I would try Ubuntu as many people from what I hear that use it, like it, and hey, free OS. Well before I was able to do all the instalations, I had to goto work, so my girlfriend (whio is not at all tech savy) decided to help. She told me she installed it, (It popped up with a thank you for installing message) She then shut it off. When she turned it on, when I turn it on, I boot right to windows, I have never installed a secondary OS. And I was hoping someone with more experiance than I could walk me through what I need to do in order to be able to dual boot Ubuntu version is 14.04 and 64bit

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• How can I reconnect to a ssh session after a broken pipe?

  - by Chauncellor

  So I was running apt-get upgrade on a server when the router decided it had been too long since it last made me angry: It dropped all connection. Moral of the story is to use screen a lot when you're on a bum router. Anyway, I logged back in and found in htop that the process was still hanging there, still waiting for my Y/n to upgrade (hadn't hit it yet, luckily). Is there any way I can reattach to a session that had been broken off? I ended up just killing it since it wasn't in the middle of package management but it would be great to know for future reference.

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