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  • Callback Contract in WCF

    Callback contracts are a very powerful concept that is easily implemented in WCF. Using this, it is very easy to achieve event-like behavior between a service and client (duplex operations).

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  • March 2010 Meeting of Israel Dot Net Developers User Group (IDNDUG)

    - by Jackie Goldstein
    Note the special date of this meeting - Wednesday March 24, 2010 For our March 2010 meeting of the Israel Dot Net Developers User Group we have the opportunity for a special meeting with Brad Abrams from Microsoft Corp, who will in Israel for the Developer Academy 4 event. Our user group meeting will be held on Wednesday March 24, 2010 .   This meeting will focus on building Line of Business applications with Silverlight 4, RIA Services and VS2010. Abstract: Building Business Applications...(read more)

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  • Context Sensitive History. Part 1 of 2

    A Desktop and Silverlight user action management system, with undo, redo, and repeat. Allowing actions to be monitored, and grouped according to a context (such as a UI control), executed sequentially or in parallel, and even to be rolled back on failure.

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  • Validating allowed characters or validating disallowed characters

    - by Tom
    I've always validated my user input based on a list of valid/allowed characters, rather than a list of invalid/disallowed characters (or simply no validation). It's just a habit I picked up, probably on this site and I've never really questioned it until now. It makes sense if you wish to, say, validate a phone number, or validate an area code, however recently I've realised I'm also validating input such as Bio Text fields, User Comments, etc. for which the input has no solid syntax. The main advantage has always seemed to be: Validating allowed chars reduces the risk of you missing a potentially malicious character, but increases the risk the of you not allowing a character which the user may want to use. The former is more important. But, providing I am correctly preventing SQL Injection (with prepared statements) and also escaping output, is there any need for this extra barrier of protection? It seems to me as if I am just allowing practically every character on the keyboard, and am forgetting to allow some common characters. Is there an accepted practice for this situation? Or am I missing something obvious? Thanks.

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  • Why does 12.04 upgrade abort with out of space error when I have lots of it?

    - by Kristian Thomsen
    When upgrading Ubuntu from 11.10 to 12.04 I discovered an unexpected problem. The upgrade was stopped because there wasn't enough free space for the installation. I managed to free some space and do the upgrade but now a prompt appears after logging in saying I'm out of space. This prompt asks me if I want to examine the problem. The "Disk Usage Analyser" is opened. In the top it says: Total filesystem capacity: 47.0 GB (used: 13.5 GB available: 33.4 GB) Folder -- Usage -- Size / -- 100% -- 12.5 GB usr -- 44.8 % -- 5.6 GB home -- 30.3 % -- 3.8 GB lib -- 13.0 % -- 1.6 GB var -- 9.1 % -- 1.1 GB boot 2.5 % 309.5 GB and a lot of small contributors like: etc, opt, sbin, bin etc. I do not really understand this problem since the analyser in the top says that I have 33.4 GB left in this file system. What can I do to make Ubuntu use the remaining space? Running df -i in the terminal gives: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda7 610800 576874 33926 95% / udev 213451 563 212888 1% /dev tmpfs 218524 486 218038 1% /run none 218524 3 218521 1% /run/lock none 218524 7 218517 1% /run/shm /dev/sda8 2264752 16371 2248381 1% /home The output of df -h Filesystem Size Used Avail Use% Mounted on /dev/sda7 9,3G 7,8G 1,1G 88% / udev 993M 4,0K 993M 1% /dev tmpfs 401M 884K 400M 1% /run none 5,0M 0 5,0M 0% /run/lock none 1003M 152K 1002M 1% /run/shm /dev/sda8 35G 4,0G 29G 13% /home /dev/sda2 101G 64G 37G 64% /media/A2C8E28BC8E25CD3 Running sudo fdisk -l gives Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000080 Device Boot Start End Blocks Id System /dev/sda1 63 96389 48163+ de Dell Utility /dev/sda2 * 98304 210434488 105168092+ 7 HPFS/NTFS/exFAT /dev/sda3 210436094 312576704 51070305+ f W95 Ext'd (LBA) /dev/sda5 306279288 312576704 3148708+ dd Unknown /dev/sda6 210436096 214341631 1952768 82 Linux swap / Solaris /dev/sda7 214343680 233873407 9764864 83 Linux /dev/sda8 233875456 306278399 36201472 83 Linux Partition table entries are not in disk order

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  • Sending keyboard commands to Ubuntu through Python. Remote for my Blackberry

    - by Rudi Strydom
    I am trying to build a remote control application to control media on my Ubuntu. Does anyone know a way in order to accomplish this. The media keys in particular. Thank you. EDIT 1: I have tried using XTE, but is seems python in truncating the input or there is a limit or something which means that you can't do Ctrl + Key key presses, which wont suit my needs. I also tried uinput, but alas you need to run it as root, which also will not quite my needs. Now I am looking at EVDEV which seems promicing, that is if I can get it working.

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  • Sending keystrokes using Python

    - by Rudi Strydom
    I am trying to build a remote control application to control media on my Ubuntu. Does anyone know a way in order to accomplish this. The media keys in particular. Thank you. EIDT: I have tried using XTE, but is seems python in truncating the input or there is a limit or something which means that you can't do Ctrl + Key key presses, which wont suit my needs. I also tried uinput, but alas you need to run it as root, which also will not quite my needs. Now I am looking at EVDEV which seems promicing, that is if I can get it working.

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  • cannot mount root filesystem on 10.04

    - by howaryoo
    I tried to apply the recommendation of question: Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) After running that command: sudo mount --bind /dev /mnt/dev I get this error message: mount: mount point /mnt/dev does not exist fdisk -l returns /dev/sda1 /dev/sda2 /dev/sda5 do I need to mount sda2 and sda5? Edited after @psusi's comment: /dev/sda1 is the boot file system It seems that I need to mount sda2 or sda5. Here is what I tried: (I tried this on a virtual machine so the sda(s) are now vda(s) ) ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/vda: 19.3 GB, 19327352832 bytes 16 heads, 63 sectors/track, 37449 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0008eece Device Boot Start End Blocks Id System /dev/vda1 * 3 496 248832 83 Linux Partition 1 does not end on cylinder boundary. /dev/vda2 498 37448 18622465 5 Extended Partition 2 does not end on cylinder boundary. /dev/vda5 498 37448 18622464 8e Linux LVM ubuntu@ubuntu:~$ ubuntu@ubuntu:~$ ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/vda5 /mnt mount: wrong fs type, bad option, bad superblock on /dev/vda5, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so ubuntu@ubuntu:~$ sudo mount -t ext2 /dev/vda5 /mnt mount: wrong fs type, bad option, bad superblock on /dev/vda5, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so ubuntu@ubuntu:~$ Any info that can help me rescue that server would be greatly appreciated!

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  • How to install packages which apt-get can't find?

    - by newcomer
    Hi, I need these packages to build Android source. But I am getting this error: $ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev ia32-libs x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev [sudo] password for asdf: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package libc6-dev-i386 E: Unable to locate package lib32ncurses5-dev E: Unable to locate package ia32-libs E: Unable to locate package lib32readline5-dev E: Unable to locate package lib32z-dev I tried to download & install say libc6-dev-i386 debian package form here. But when I double click on the .deb file Ubuntu Software Manager says wrong architecture 'amd64'. (My OS: Ubuntu 10.10 (updated), Processor: AMD phenom II.)

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