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Articles indexed in December 2010

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• books or online resources to prepare for .NET interviews for senior developer role

  - by RKP

  Hi, can you suggest some good books or online resources (FAQ or articles) to prepare for .NET interviews (.NET concepts, ASP.NET, C# etc) for senior developer role? something to refresh the concepts, not too much detailed. there could be stuff I haven't done before (that applies to everyone), so at least knowing little bit about it, will definitely help. google search shows me some website with lots of QA, but they are not authentic (I found some answers inaccurate). thanks in advance.

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• What is the Action returned by the subscribe parameter of IObservable.Create actually for?

  - by James Hay

  The method definition of IObservable.Create is: public static IObservable<TSource> Create<TSource>( Func<IObserver<TSource>, Action> subscribe ) I get that the function is called once the observable is subscribed to, where by I can then call OnNext, OnError and OnComplete on the observer. But why do I need to return an Action from the subscibe parameter and when will it actually be called?

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• Jquery - Change Background position on 1st click, reset on the 2nd.

  - by Richard

  Evening all! I have half a script that I need to change the CSS background position of an element when it is clicked - this works fine. However I need the CSS to reset the background position to 0 0 on the 2nd click; Help much appreciated! $(document).ready(function(){ $('#login-btn').click(function(){ $('#login-btn').css('backgroundPosition', '0px -39px'); }, function(){ $('$login-btn').css('backgroundPosition', '0px 0px'); }); });

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• jQuery - Set selected value of all dropdowns on page

  - by Tgibson

  Hello Frieds, I have another jQuery question. For a user control with lots of database activity, I would like to use jQuery to set the selected values of all of the dropdowns to their "current" value. I want to do this to make the page appear to have finished the database call. My jQuery skill is not the best, but I believe I need to use the pageLoad(). And since each dropdown is inside of a user control I can search for those dropdowns beginning with "usrControl" $('select[id ^="usrControl"'].each(function(){ var selectedValue = $(this).val() $(this).val(selectedValue) }); Something like this is what I have in mind. Thanks

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• Is it possible to aggregate over differing where clauses?

  - by BenAlabaster

  Is it possible to calculate multiple aggregates based on differing where clauses? For instance: Let's say I have two tables, one for Invoice and one for InvoiceLineItems. The invoice table has a total field for the invoice total, and each of the invoice line item records in the InvoiceLineItems table contains a field that denotes whether the line item is discountable or not. I want three sum totals, one where Discountable = 0 and one where Discountable = 1 and one where Discountable is irrelevant. Such that my output would be: InvoiceNumber Total DiscountableTotal NonDiscountableTotal ------------- ----- ----------------- -------------------- 1 53.27 27.27 16.00 2 38.94 4.76 34.18 3... The only way I've found so far is by using something like: Select i.InvoiceNumber, i.Total, t0.Total As DiscountableTotal, t1.Total As NonDiscountableTotal From Invoices i Left Join ( Select InvoiceNumber, Sum(Amount), From InvoiceLineItems Where Discountable = 0 Group By InvoiceNumber ) As t0 On i.InvoiceNumber = t0.InvoiceNumber Left Join ( Select InvoiceNumber, Sum(Amount) From InvoiceLineItems Where Discountable = 1 Group By InvoiceNumber ) As t1 On i.InvoiceNumber = t1.InvoiceNumber This seems somewhat cumbersome, it would be nice if I could do something like: Select InvoiceNumber, Sum(Amount) Where Discountable = 1 As Discountable Sum(Amount) Where Discountable = 0 As NonDiscountable Group By InvoiceNumber I realize that SQL is completely invalid, but it logically portrays what I'm trying to do... TIA P.S. I need this to run on a SQL Server 2000 instance, but I am also interested (for future reference) if/how I would achieve this on SQL Server 2005/2008.

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• Validate authenticity of website owner

  - by Cyber Junkie

  Hello all! I'm planning to develop a web app where users will list their site/blog. When people submit their sites, how can I confirm that they are the owners of it? So for instance there is a user Mark who wants to submit someone else's website without their approval. I want to restrict Mark from doing so unless he is the actual owner. My idea was to do a comparison between the user's email domain and the website domain she/he wants to submit. If they match allow the user to submit the website. However most people don't register with their website domain address.. or perhaps I'll implement a Facebook connect in the future. What other methods would you suggest?

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• Syntax error in INSERT INTO statement

  - by user454563

  I wrote a program that connects to MS Access. When I fill in the fields and add a new item to Access the program fails. The exception is "Syntax error in INSERT INTO statement" Here is the relevant code. **************************************************************** AdoHelper.cs **************************************************************** using System; using System.Collections.Generic; using System.Text; using System.Data; using System.Data.OleDb; namespace Yad2 { class AdoHelper { //get the connection string from the app.config file //Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\Yad2.accdb static string connectionString = Properties.Settings.Default.DBConnection.ToString(); //declare the db connection static OleDbConnection con = new OleDbConnection(connectionString); /// <summary> /// To Execute queries which returns result set (table / relation) /// </summary> /// <param name="query">the query string</param> /// <returns></returns> public static DataTable ExecuteDataTable(string query) { try { con.Open(); OleDbCommand command = new OleDbCommand(query, con); System.Data.OleDb.OleDbDataAdapter tableAdapter = new System.Data.OleDb.OleDbDataAdapter(command); DataTable dt = new DataTable(); tableAdapter.Fill(dt); return dt; } catch (Exception ex) { throw ex; } finally { con.Close(); } } /// <summary> /// To Execute update / insert / delete queries /// </summary> /// <param name="query">the query string</param> public static void ExecuteNonQuery(string query) { try { con.Open(); System.Data.OleDb.OleDbCommand command = new System.Data.OleDb.OleDbCommand(query, con); command.ExecuteNonQuery(); } catch (Exception ex) { throw ex; } finally { con.Close(); } } /// <summary> /// To Execute queries which return scalar value /// </summary> /// <param name="query">the query string</param> public static object ExecuteScalar(string query) { try { con.Open(); System.Data.OleDb.OleDbCommand command = new System.Data.OleDb.OleDbCommand(query, con); /// here is the Excaption !!!!!!!!! return command.ExecuteScalar(); } catch { throw; } finally { con.Close(); } } } } **************************************************************************** **************************************************************************** DataQueries.cs **************************************************************************** using System; using System.Collections.Generic; using System.Text; using System.Data; namespace Yad2 { class DataQueries { public static DataTable GetAllItems() { try { string query = "Select * from Messages"; DataTable dt = AdoHelper.ExecuteDataTable(query); return dt; } catch (Exception ex) { throw ex; } } public static void AddNewItem(string mesNumber, string title , string mesDate , string contactMail , string mesType , string Details ) { string query = "Insert into Messages values(" + mesNumber + " , '" + title + "' , '" + mesDate + "' , '" + contactMail + "' , , '" + mesType + "' , '" + Details + "')"; AdoHelper.ExecuteNonQuery(query); } public static void DeleteDept(int mesNumber) { string query = "Delete from Item where MessageNumber=" + mesNumber; AdoHelper.ExecuteNonQuery(query); } } } *********************************************************************************************** plase help me .... why the program falls ?

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• Mobile Safari SVG Problem

  - by md5sum

  I'm trying to get an SVG image to show up on my iPhone (or iPad) default browser, but I can't seem to get even just a rect to show up. Example at: http://www.invalidpage.com/svg/svgtest.html Source: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/html1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-us"> <head> <title>SVG iPhone Test</title> </head> <body> <div> <svg width="500" height="220"> <rect x="2" y="2" width="496" height="216" stroke="#000" stroke-width="2px" fill="transparent"></rect> </svg> </div> </body> </html>

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• How to determine which version of Oracle Client is being used from the server.

  - by Robert Love

  Using Oracle 10g. ( 10.2.0.4 ) Possibly by looking at either logs or system tables is there a way to determine which version of the oracle client each connection is using. Our systems initially had 8.1.7 Clients, and then 9.X clients. We attempted to manually locate all machines that had older clients and upgrade them to to 10.2 Clients. We are seeking a method to audit (from the server) if we were successful in upgrading all of our client machines.

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• Best and safest Java Profiler for production use?

  - by Pete

  I'm looking for a Java Profiler for use in a very high demand production environment, either commercial or free, that meets all of the following requirements: Lightweight integration with code (no recompile with special options, no code hooks, etc). Dropping some profiler specific .jars alongside the application code is ok. Should be able to connect/disconnect to the JVM without restarting the application. When profiling is not active, no impact to performance When profiling is active, negligible impact to performance. Very slight degradation is acceptable. Must do all the 'expected' stuff a profiler does - time spent in each method to find hotspots, object allocation/memory profiling, etc. Essentially I need something that can sit dormant in production when everything is fine without anyone knowing or caring that it is there, but then be able to connect to it hassle (and performance degradation) free to pinpoint the hard to find problems like hotspots and synchronization issues.

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• Dojo and Separate JavaScript File

  - by Bunch

  For a project I needed to use the ArcGIS API for some mapping. To use this you need to use Dojo but in this case all it really comes down to is adding some require lines and a addOnLoad on your web page. At first everything was working great, the maps rendered and the various layers would populate as needed. Once it was working I started moving the various javascript functions into their own files to keep everything nice and neat. Then the problems started, mainly the map would not show up any more. So that was a pretty big problem. Luckily the fix was pretty simple, just move the dojo.addOnLoad line into it’s own script tag. If I had the dojo.addOnLoad in the same script block as the various require lines it would not work as expected. Works: <script type="text/javascript" language="javascript" src="javascript/test.js" />     <script type="text/javascript">       dojo.require("esri.map");       dojo.require("esri.tasks.locator");       dojo.require("esri.tasks.query");       dojo.require("esri.tasks.geometry");  </script>  <script type="text/javascript">      dojo.addOnLoad(init);  </script> Does not work: <script type="text/javascript" language="javascript" src="javascript/test.js" /> <script type="text/javascript">       dojo.require("esri.map");       dojo.require("esri.tasks.locator");       dojo.require("esri.tasks.query");       dojo.require("esri.tasks.geometry");       dojo.addOnLoad(init); </script> Technorati Tags: JavaScript,Dojo

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• Connecting/Adding a private network on windows server 2008

  - by WhyMe

  Hey all, I have a dual server configuration on a host provider using VPS. I was told by my Host provider that in order to use free bandwidth between my two servers (they are in the same location) I need to add a alias "subnet" to a specific ip (A private network, VPN). How do I add an aliased ip in widnwos? in Linux the relevant command is supposed to be (By my search in blogs) "ifconfig eth0:1 10.129.175.165 netmask 255.255.255.0" They also said that another way to connect between the servers (should also be faster) is to use "private lan", but as it happens I don't know how to define one :(. Is there a windows equivalent or another way to do this? I have checked my ip config and found no indication of the private lan or the VPN ip.

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• Nginx Load Balancer 403 error

  - by user64473

  I am trying to install nginx as a load balancer with apache backends, so that when I point my sites to the nginx server it serves up the content from the apache backend. I have the apache configuration set up correctly on both (i.e when I go to the site on the apache servers it works great) but when I use the nginx load balancer as the site I get 403 error. I have no idea why as it isn't even accessing any files on the server, thusly there aren't any files to be forbidden access to. My virtual host is enabled and looks like this: upstream webs { server 10.0.0.30 weight=1; server 10.0.0.31 weight=1; } server { listen 80; server_name www.example.com example.com; access_log /var/log/nginx/access.log; location / { proxy_pass http://webs; include /etc/nginx/proxy.conf; } } and my nginx.conf looks like this: user www-data; worker_processes 4; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; # multi_accept on; } http { include /etc/nginx/mime.types; access_log /var/log/nginx/access.log; sendfile on; #tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; tcp_nodelay on; gzip on; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; client_max_body_size 10m; client_body_buffer_size 128k; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffers 32 4k; } Can any geniuses out there tell me what I am doing wrong?

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• Securing bash scripts

  - by minnur

  Hi There, Does anybody know what is the best way to secure bash scripts. I have a script which creates database and source code backup and ftp it to other server. And login/password for destination ftp are plain text. I need somehow encrypt it or hide it in case of website hacking. Or should i create script written on C to create bash file then run it and delete ? Thanks. Thanks for the answers and I am sorry, i wasn't clear enough. I would like to clarify my question in the following items. We are storing the data in Rackspace Cloud files. We can't pull as Cloud files doesn't allow you run a script. We can write the script to run on Server A and pull FTP and MySQL data on servers B, C, D, etc. And we want to protect the passwords on A from the situation where A is hacked. Can we compile our script file to hide them? Thanks

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• How do I reformat/reinstall an OS on a hard drive after its been wiped by eban?

  - by Aggrevated

  I am trying to install XP SP2 Home on a Dell Inspiron 531s. Yes it came with Vista but I happen to own a legal copy of XP. I bought the hard drive off eBay(used). I changed the bios settings to boot from CD and when I start up the computer it goes to the hard drive which says its been cleaned using eban XX.XXX.XXX. My problem is that I can't get the PC to boot from the XP disk. I have tried putting the disk into another PC it works. I have put the bad hard drive back in and the dvd+rw works. I am really stumped and am beginning to think that the hard drive is unusable. I only have the sata cords for 1 hard drive to be hooked up at a time. Any ideas or suggestions or confirmation that I can't use this hard drive would be appreciated. Yes I am probably a 'noob' but I have installed XP and Vista many times without any problems. I don't need to be put down on my level of experience I just need answers. Thanks Everyone

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• Recommendation using Client side performance monitoring (boomerang/jiffy/episodes)

  - by Yasei No Umi

  There are a few Client-side JavaScript libraries that check web-site performance on the client side: Jiffy (http://code.google.com/p/jiffy-web/) Episodes (http://stevesouders.com/episodes/) by Steve Sounders Boomerang (http://yahoo.github.com/boomerang/doc/) by Yahoo! Have you used any of them or a similar too? What did you use for the server-side? for reporting? Is this a recommended approach? If not, how should I monitor my web-site performance from the end-user's view?

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• Is it possible to have a cell in table1 "point to" a cell in table2?

  - by Lewray

  I have a hierarchical structure in a database driven software application. Each row in parentTable 'owns' a number of rows in childTable. If the childTable does not have a value set in columnA then it should return the value specified in the appropriate row of parentTable columnB. Is it possible to implement a pointer or cell reference somehow so that I do not have to copy values from parent to child. (A change in parent could result in a large number of changes in child). If this is not possible, could anyone suggest a different approach?

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• restore -A usage

  - by Martin v. Löwis

  I have created a number of dump files using Linux dump(8), using the -A option to get a table of contents on disk (the backups are on tape). Now I'm trying to look into these archive files, using restore -i -A <archive>` However, this insists on asking what tape to use, and complains if I say none. What am I doing incorrectly? I was hoping that I can use these archive index files without having to insert the tape to use.

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• Family server setup [closed]

  - by Manny

  Hi all, I really hope some of you can give me some direction. I have setup a linux server at home and through samba I can access files from different computers in my home. I would like to use this server as a file-server for my family (brothers, sisters and parents who all live in their own homes). I really like the way it is set up right now with user and permission controls, but I've read that it is bad idea to open up the samba port to the world. The requirements are simple: 1) it should be easy to access, by using standard web browsers or mounting the drive (shouldn't have to use any VPN setup or use putty etc) 2) should be somewhat secure. We just want to share family pictures instead of putting them on facebook or picasa or other web server, nothing top secret. Here is what I've looked into: 1)Webdav. It seems decent but seems like it windows7 doesn't like it very much, even with digest mode authentication. User controls and permissions are not as flexible as samba (or at least to my knowledge). I really like the user and group permissions in samba, but if I could live with webdav if it worked seamlessly with windows, it should just work shouldn't it? 2) I read somewhere to stay away from ftp as it is outdated and that there are newer and better internet file-server setups? Was that a reference to webdav? I am so confused, please help... Manny

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• Zenoss No space left on device Error

  - by Pastelinux

  Site Error An error was encountered while publishing this resource. Sorry, a site error occurred. Traceback (innermost last): Module ZPublisher.Publish, line 231, in publish_module_standard Module ZPublisher.Publish, line 165, in publish Module Zope2.App.startup, line 211, in __call__ Module Products.ZenUI3.browser, line 105, in __call__ Module Products.Five.browser.pagetemplatefile, line 60, in __call__ Module zope.pagetemplate.pagetemplate, line 115, in pt_render Module zope.tal.talinterpreter, line 271, in __call__ Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 858, in do_defineMacro Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 533, in do_optTag_tal Module zope.tal.talinterpreter, line 518, in do_optTag Module zope.tal.talinterpreter, line 513, in no_tag Module zope.tal.talinterpreter, line 343, in interpret Module zope.tal.talinterpreter, line 620, in do_insertText_tal Module Products.PageTemplates.Expressions, line 203, in evaluateText Module Products.PageTemplates.Expressions, line 222, in _handleText Module zope.component._api, line 174, in queryUtility Module zope.component.registry, line 165, in queryUtility Module ZODB.Connection, line 834, in setstate Module ZODB.Connection, line 884, in _setstate Module ZEO.ClientStorage, line 815, in load Module ZEO.cache, line 143, in call Module ZEO.cache, line 607, in store IOError: [Errno 28] No space left on device Went in to check my server through zenoss today and it looks like somehow my server is full. Which when i look at my server its only 85% full: unclebob:~# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/unclebob--vg0-unclebob--root 1.9G 1.5G 335M 82% / tmpfs 471M 0 471M 0% /lib/init/rw udev 10M 820K 9.2M 9% /dev tmpfs 471M 0 471M 0% /dev/shm overflow 1.0M 1.0M 0 100% /tmp /dev/hde1 942M 36M 859M 5% /boot unclebob:/tmp# df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/mapper/unclebob--vg0-unclebob--root 121920 54844 67076 45% / tmpfs 120489 3 120486 1% /lib/init/rw udev 120489 1520 118969 2% /dev tmpfs 120489 1 120488 1% /dev/shm overflow 120489 14 120475 1% /tmp /dev/hde1 61312 33 61279 1% /boot It looks like theres these two files: .ICE-unix/ .X11-unix/ They had been hidden. I'll remove those. Any idea upon what they maybe? Any ideas on a fix? Probably has something to do with Zenoss

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• Get-Mailbox not returning all mailboxes

  - by rotard

  I am trying to set up an exchange mailbox backup job with Vembu Storegrid and StoreGrid is unable to list the mailboxes for the client. While I was troubleshooting the issue, I did notice another thing: running the Get-Mailbox command on the mail server as the backup user only shows the mailbox for that account, while running Get-Mailbox as my admin account returns a list of what appears to be all the mailboxes. My service account is a member of "Administrators", "Domain Admins", and "Domain Users". What additional permissions might be required to list all mailboxes in the system?

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• Error when connecting to shared Windows Printers

  - by TrueDuality

  I'm replacing our Windows 2003 print server with one running on Windows 2008 R2. I have connected and configured all of our printers and can successfully print to them from the server itself. All of the printers are shared and user's have permission to print on all of them. Whenever one of our clients attempts to connect through the shares they receive the following error message: Operation could not be completed (error 0x0000709). Double check the printer name and make sure that the printer is connected to the network. No messages are generated on the client Event Log nor is anything generated on the server. I have reinstalled the drivers as suggested by a few forum posts I came across and it didn't solve the issue. There are twelve different printer drivers and they are all experiencing this issue so I believe it is unrelated to the driver. I have disabled UAC on both the client and server since that has caused so many headaches before, but it too did not solve this problem. Does anyone have any idea what may be causing this?

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• Setup a local file server for two networks

  - by rzlines

  Hi I would like to setup a local linux file server (using centos and samba) that can be accessed by two independent local networks in the same house. I have 2 networks on the same floor which have Windows 7 computers, but the networks are split as we have 2 internet connections. How do I go about this? Additional info: Currently both the networks use DropBox to send files to each other but that happens via the Internet and hence its slow. Would like to achieve the same locally to increase the speed.

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• Subversion multi checkout post-commit hook?

  - by FLX

  The title must sound strange but I'm trying to achieve the following: SVN repo location: /home/flx/svn/flxdev SVN repo "flxdev" structure: + Project1 ++ files + Project2 + Project3 + Project4 I'm trying to set up a post-commit hook that automatically checks out on the other end when I do a commit. The post-commit doc explicitly lists the following: # POST-COMMIT HOOK # # The post-commit hook is invoked after a commit. Subversion runs # this hook by invoking a program (script, executable, binary, etc.) # named 'post-commit' (for which this file is a template) with the # following ordered arguments: # # [1] REPOS-PATH (the path to this repository) # [2] REV (the number of the revision just committed) So I made the following command to test: REPOS="$1" REV="$2" echo "Updated project $REPOS to $REV" However when I edit files in Project1 for example, this outputs "Updated project /home/flx/svn/flxdev to 1016" I'd like this to be: "Updated project Project1 to 1016" Having this variable allows me to specify to do different actions per project post-commit. How can I specify the project parameter? Thanks! Dennis

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• Family server setup

  - by Manny

  Hi all, I really hope some of you can give me some direction. I have setup a linux server at home and through samba I can access files from different computers in my home. I would like to use this server as a file-server for my family (brothers, sisters and parents who all live in their own homes). I really like the way it is set up right now with user and permission controls, but I've read that it is bad idea to open up the samba port to the world. The requirements are simple: 1) it should be easy to access, by using standard web browsers or mounting the drive (shouldn't have to use any VPN setup or use putty etc) 2) should be somewhat secure. We just want to share family pictures instead of putting them on facebook or picasa or other web server, nothing top secret. Here is what I've looked into: 1)Webdav. It seems decent but seems like it windows7 doesn't like it very much, even with digest mode authentication. User controls and permissions are not as flexible as samba (or at least to my knowledge). I really like the user and group permissions in samba, but if I could live with webdav if it worked seamlessly with windows, it should just work shouldn't it? 2) I read somewhere to stay away from ftp as it is outdated and that there are newer and better internet file-server setups? Was that a reference to webdav? I am so confused, please help... Manny

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