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  • Key Windows Phone Development Concepts

    - by Tim Murphy
    As I am doing more development in and out of the enterprise arena for Windows Phone I decide I would study for the 70-599 test.  I generally take certification tests as a way to force me to dig deeper into a technology.  Between the development and studying I decided it would be good to put a post together of key development features in Windows Phone 7 environment.  Contrary to popular belief the launch of Windows Phone 8 will not obsolete Windows Phone 7 development.  With the launch of 7.8 coming shortly and people who will remain on 7.X for the foreseeable future there are still consumers needing these apps so don’t throw out the baby with the bath water. PhoneApplicationService This is a class that every Windows Phone developer needs to become familiar with.  When it comes to application state this is your go to repository.  It also contains events that help with management of your application’s lifecycle.  You can access it like the following code sample. 1: PhoneApplicationService.Current.State["ValidUser"] = userResult; DeviceNetworkInformation This class allows you to determine the connectivity of the device and be notified when something changes with that connectivity.  If you are making web service calls you will want to check here before firing off. I have found that this class doesn’t actually work very well for determining if you have internet access.  You are better of using the following code where IsConnectedToInternet is an App level property. private void Application_Launching(object sender, LaunchingEventArgs e){ // Validate user access if (Microsoft.Phone.Net.NetworkInformation.NetworkInterface.NetworkInterfaceType != Microsoft.Phone.Net.NetworkInformation.NetworkInterfaceType.None) { IsConnectedToInternet = true; } else { IsConnectedToInternet = false; } NetworkChange.NetworkAddressChanged += new NetworkAddressChangedEventHandler(NetworkChange_NetworkAddressChanged);}void NetworkChange_NetworkAddressChanged(object sender, EventArgs e){ IsConnectedToInternet = (Microsoft.Phone.Net.NetworkInformation.NetworkInterface.NetworkInterfaceType != Microsoft.Phone.Net.NetworkInformation.NetworkInterfaceType.None);} Push Notification Push notification allows your application to receive notifications in a way that reduces the application’s power needs. This MSDN article is a good place to get the basics of push notification, but you can see the essential concept in the diagram below.  There are three types of push notification: toast, Tile and raw.  The first two work regardless of the state of the application where as raw messages are discarded if your application is not running.   Live Tiles Live tiles are one of the main differentiators of the Windows Phone platform.  They allow users to find information at a glance from their start screen without navigating into individual apps.  Knowing how to implement them can be a great boost to the attractiveness of your application. The simplest step-by-step explanation for creating live tiles is here. Local Database While your application really only has Isolated Storage as a data store there are some ways of giving you database functionality to develop against.  There are a number of open source ORM style solutions.  Probably the best and most native way I have found is to use LINQ to SQL.  It does take a significant amount of setup, but the ease of use once it is configured is worth the cost.  Rather than repeat the full concepts here I will point you to a post that I wrote previously. Tasks (Bing, Email) Leveraging built in features of the Windows Phone platform is an easy way to add functionality that would be expensive to develop on your own.  The classes that you need to make yourself familiar with are BingMapsDirectionsTask and EmailComposeTask.  This will allow your application to supply directions and give the user an email path to relay information to friends and associates. Event model Because of the ability for users to switch quickly to switch to other apps or the home screen is just one reason why knowing the Windows Phone event model is important.  You need to be able to save data so that if a user gets a phone call they can come back to exactly where they were in your application.  This means that you will need to handle such events as Launching, Activated, Deactivated and Closing at an application level.  You will probably also want to get familiar with the OnNavigatedTo and OnNavigatedFrom events at the page level.  These will give you an opportunity to save data as a user navigates through your app. Summary This is just a small portion of the concepts that you will use while building Windows Phone apps, but these are some of the most critical.  With the launch of Windows Phone 8 this list will probably expand.  Take the time to investigate these topics further and try them out in your apps. del.icio.us Tags: Windows Phone 7,Windows Phone,WP7,Software Development,70-599

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  • In virtualbox, I can't access the dvd drive to install a guest host

    - by user211062
    I have installed a fresh copy of Ubuntu Server 12.04 and VirtualBox 4.3. I have set up a VM called "MediaServer" and tried to start it. I then get the following error: Cannot open host device '/dev/sr0' for readonly access. Check the permissions of that device ('/bin/ls -l /dev/sr0'): Most probably you need to be member of the device group. Make sure that you logout/login after changing the group settings of the current user (VERR_ACCESS_DENIED) I have looked all over the Internet and have been unable to find a solution. Using Webmin, I tried changing the group settings so that my user name was in the "vboxusers" group, but that did not work either. I tried various other changes in group settings and none of them worked. Also, I tried rebooting the server after the changes and that didn't work either. I have been following a guide on how to set up an Ubuntu server from the website "linuxhomeserverguide.com" and when it came to the section where you could finally set up your first virtual machine, I am stumped. I would really appreciate it if someone could help me. Thanks in advance.

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  • Is there any way to use devices like mp3 players when they are charging?

    - by GeoB
    The question is simple I think. All we have encounter gagets that they don't fuction while they are in charge, like cameras or mp3 players. But, we know that cell phones or laptops can have full function, when they charge with a charger, like USB connector. Is it in the programming? Why this happens? Can we change that with some device e.g. controlling the charging? I want to use a portable USB charger for my mp3, but I can't wait 3 hours for it to charge, because I cannot listen to music. It notices the charger, and gets in charge mode. Nothing functions until I unplug it. Thanks a lot

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  • Mounting Nexus 7 on Ubuntu 12.04 through USB?

    - by Pomario
    I would like to transfer files between my Ubuntu 12.04 and Nexus 7 (Android 4.2) I have followed another post carefully. BUT upon... mount /mnt/nexus7 I get... Android device detected, assigning default bug flags.Listing File Information on Device with name: (NULL) and even doing an "ls" in "/mnt" generates... ls: cannot access nexus7: Transport endpoint is not connected Ideas why that is happening???

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  • Form-Fitting Laptop Hard Drive?

    - by Peder Rice
    Not sure how to explain this exactly... if you need me to clarify, please add a comment and I'll address it. I'm looking for a USB hard drive that conforms to a laptop. Perhaps something that can be plugged in and carried around, tossed into a backpack without fear of ruining the connector or accidentally coming unplugged. Has anyone seen a hard drive like this?

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  • IDE hard drive and a SATA Dock

    - by admintech
    I bought a very nice SATA dock for my computer, plug and play and you just plug the drive into the dock and you can access the data. I have since then found an IDE drive i wish to access, but cant figure out how to do it, as i would guess i need, one cable converting IDE to SATA and one cable to plug it into a SATA power connection. Dock = http://tiny.cc/dc5ie

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  • Campus Solutions for Higher Education: New Directions Drive More Value for Customers

    Hear how Oracle's vision and product development direction for the Campus Solutions suite of products is helping customers achieve cost savings, agility and increased value they need to succeed in today's challenging economic environment. Learn how extending the reach of Campus Solutions with a SOA-based architecture is a strategy that will benefit customers far into the future, and hear what's next on the horizon for Campus Solutions customers.

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  • Cascading KVM switches

    - by einpoklum
    I have a not-so-small number of computers (say, 5) which I want to access with a single keyboard, USB and monitor. I can get an 8-port KVM switch, which is a pretty expensive piece of hardware; however, in theory, I should be able to cascade KVM switches: Have one 4-port KVM switch between 2 other KVMs (a 2-port and a 4-port). Is this doable (with typical off-the-shelf switches and cables)? Has anyone had experience doing this? Note: I'm interested in USB-only for the keyboard and mouse, and either VGA or DVI for the display. Audio and PS/2 connections are irrelevant for me..

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  • There is a way to change the SkyDrive default path in Windows 8.1?

    - by RobsonROX
    The deeper integration with SkyDrive is truly beneficial, but my laptop has a somewhat small primary drive (an 128 Gb MSATA SSD), and when possible, i try to move installations and other folders(like Documents and Downloads) to the secondary, 1 Tb drive. But i couldn't find any option to change the SkyDrive folder (it used to be in the secondary drive prior to the upgrade). Anyone have some idea how to change it? Thanks in advance! Edit 1: I've looked for an option to change this folder, to no avail. Really, it could only be a problem if i choose the option to keep my files offline, but it is exactly the option that i was looking for. Edit 2: Trying to install the old desktop app, the installer just quits silently.

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  • La Preview de Windows 8.1 disponible dans quelques heures, le compte à rebours est enclenché

    Windows Blue la prochaine mise à jour majeure de Windows 8 ? Microsoft aurait adopté un cycle annuelÀ peine Windows 8 disponible que des rumeurs courent déjà sur son successeur.Selon un article du quotidien The Verge, se référant à des sources anonymes proches de Microsoft, la firme serait déjà en train de travailler sur Windows Blue, la prochaine version de son système d'exploitation.Décrit comme une mise à jour majeure pour Windows 8, l'OS serait disponible mi-2013, à un prix nettement inférieur, voire même gratuit. Cet OS mettra fin aux cycles longs des sorties de nouvelles versions de Windows et aux Services Pack, pour adopter un rythme de mises à jour annuelles tout comme Mac OS X ou encore...

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  • Slow writing HDD speed, Ubuntu 12.04 64-bit, Thinkpad T520i

    - by pyc
    It seems that (but I'm not completely sure), that when I'm copying files from gigabit network to HDD, I can't use full potential of the network which in my case is about 60 MB/s, because HDD writing is so slow like lower than 10 MB/s, and also it's slowing down the whole system which becomes pretty much unresponsive, almost impossible to work with. Copying files to samba share residing at Ubuntu machine, connected to share from Windows 7, I'm completely sure my network equipment is OK, and there's no CPU intensive process on Ubuntu except smbd getting about 10-20% from time to time which I think is OK. Something here is burried deep I think, maybe even in kernel. Already tried to switch from AHCI to compatibility mode, and turning acpi on and off - nothing helped. So it's like HDD buffer is full and emptying slowly while machine is sluggish, load is about 3 to 4. Somebody experienced the similar problems? Some help on troubleshooting process and identifying the cause would be helpful too :) Thanks!

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  • unable to mount disks in usb dvd drive

    - by Arcath
    I have 2 USB DVD drives. One that I borrowed from work which I have been testing with which works fine for me, which is why I brought one of myself. When I try and mount my new dvd drive this happens: [18:06:45][arcath@londinium][~] sudo mount /dev/sr0 /mnt/dvd/ mount: special device /dev/sr0 does not exist /dev/sr0 is only in the list when the drive is attached and it works on other machines using the same cables so it must be something with my server. The server is running Ubuntu 10.10 server

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  • System checks for disk drive error every time it boots

    - by Starx
    When my disk space for the ubuntu installation partition was getting low, from a live cd, I used gparted to increase its volume capacity, but deleting another partition and merging it to the ubuntu partition. Since then onwards, I am receiving disk checking for errors at boot screen for my partitions, always. What seem to be causing this and how to fix it? Update Here is my boot.log if it provides few insight fsck from util-linux 2.19.1 fsck from util-linux 2.19.1 /dev/sda1 was not cleanly unmounted, check forced. ubuntu: clean, 501325/1310720 files, 2958455/5242880 blocks /dev/sda1: 241/51272 files (3.3% non-contiguous), 73541/102400 blocks mountall: fsck /boot [358] terminated with status 1 Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox ... /dev/sda1 is a separate grub partition for my dual OS's

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  • Resize hard drive partition to make more space for /var

    - by user3357381
    I am running out of space in the /var partition. I have plenty of space in my /home partition. How do I shrink the /home partition to make more space for the /var partition? I have read some blogs that say to use the GParted Live CD. As a new user, I'm not quite sure if this is the ideal route. What is the best way to create more space for /var ? Output of df -h : Filesystem Size Used Avail Use% Mounted on /dev/sda2 19G 7.1G 11G 41% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 7.9G 8.0K 7.9G 1% /dev tmpfs 1.6G 1.5M 1.6G 1% /run none 5.0M 0 5.0M 0% /run/lock none 7.9G 624K 7.9G 1% /run/shm none 100M 60K 100M 1% /run/user /dev/sda4 454M 75M 352M 18% /boot /dev/sda5 2.3G 2.1G 36M 99% /var /dev/sda3 178G 1.3G 168G 1% /home /dev/sda6 2.8G 5.8M 2.6G 1% /tmp /dev/sdb1 3.7T 401G 3.3T 11% /hdd

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