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• How to check misspelled email during user registration

  - by Nulldevice

  I use an email registration and confirmation in my project (yes, I know about OpenID. In my counry, a main email service lack it). Sometimes users misspell their email addresses. I know about this due to "message could not be delivered" letters in a mailbox. A misspelled address is absolutely correct, because I check it with a regular expression - say, jon[email protected] intstead of [email protected]. And I do not want to duplicate a email field in a registration form (who likes it?). Request processing routine cannot wait for email delivery - it could take an unpredictable time. So, my script will return to user a confirmation message "An email was sent". And the user will wait for it forever (of cause, not - he/she will turn to an alternative project with a more perfect registration system). Does someone knows how it can be improved (in any programming language)?

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• C# File Exception: cannot access the file because it is being used by another process

  - by Lirik

  I'm trying to download a file from the web and save it locally, but I get an exception: C# The process cannot access the file 'blah' because it is being used by another process. This is my code: File.Create("data.csv"); // create the file request = (HttpWebRequest)WebRequest.CreateDefault(new Uri(url)); request.Timeout = 30000; response = (HttpWebResponse)request.GetResponse(); using (Stream file = File.OpenWrite("data.csv"), // <-- Exception here input = response.GetResponseStream()) { // Save the file using Jon Skeet's CopyStream method CopyStream(input, file); } I've seen numerous other questions with the same exception, but none of them seem to apply here. Any help?

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• UISearchBar Above Navigation Bar

  - by JonB

  Hi, All the applications I have ever seen, that use UINavigationBars, have the UINavigationBar right at the top of the app. If you want to use a UISearchBar then it's usually in the 'header' of the UITableView such as this... What I would like to do is to put a UISearchBar object above/outside of the UINavigationBar/Controller, but i've been having some problems doing this. Firstly, is what I want to achieve even possible? What would the easiest way to do this be? Starting with the navigation based application seems to make the navigationbar/view un-resizeable! Thanks, Jon

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• Getting started with Windows Azure

  - by jonhobbs

  Hi All, I'm going to sound like a complete newbie here but here goes... I've just signed up for a Windows Azure account and was hoping to get a simple hello world aspx page up and running in a browser to see how it all works but I can't seem to find a simple guide to getting a very simple web application running. I've got as far as setting up a "service" and going onto the "deploy" page but it's asking me upload an "application package". I've looked on MSDN but there aren't any simple guides, just reams of documentation talking about "roles" and "development fabric". For somebody that is proficient in HTML/CSS and knows a little abit about asp.net it may just as well be in another language. So, does anybody know how to upload a simple aspx page and then access it in a browser? Jon

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• Reorganizing many to many relationships in Django

  - by Galen

  I have a many to many relationship in my models and i'm trying to reorganize it on one of my pages. My site has videos. On each video's page i'm trying to list the actors that are in that video with links to each time they are in the video(the links will skip to that part of the video) Here's an illustration Flash Video embedded here Actors... Ted smith: 1:25, 5:30 jon jones: 5:00, 2:00 Here are the pertinent parts of my models class Video(models.Model): actor = models.ManyToManyField( Actor, through='Actor_Video' ) # more stuff removed class Actor_Video(models.Model): actor = models.ForeignKey( Actor ) video = models.ForeignKey( Video) time = models.IntegerField() Here's what my Actor_Video table looks like, maybe it will be easier to see what im doing id actor_id video_id time (in seconds) 1 1 3 34 2 1 3 90 i feel like i have to reorganize the info in my view, but i cant figure it out. It doesn't seem to be possible in the template using djangos orm. I've tried a couple things with creating dictionaries/lists but i've had no luck. Any help is appreciated. Thanks.

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• Most wanted feature for C# 4.0 ?

  - by Romain Verdier

  Some blogs on the Internet give us several clues of what C# 4.0 would be made of. I would like to know what do you really want to see in C# 4.0. Here are some related articles: C# 4 tag on Jon Skeet's blog 4 features for C# 4 What do you want in C# 4 Future Focus - I: Dynamic Lookup .NET 4, C# 4 and the DLR Channel 9 also hosts a very interesting video where Anders Hejlsberg and the C# 4.0 design team talk about the upcoming version of the language. I'm particularly excited about dynamic lookup and AST. I hope we would be able to leverage - at some level - the underlying DLR mechanisms from C#-the-static-language. What about you ?

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• Lock-free multi-threading is for real threading experts...

  - by vdhant

  I was reading through an answer that Jon Skeet gave to a question and in it he mentioned this: As far as I'm concerned, lock-free multi-threading is for real threading experts, of which I'm not one. Its not the first time that I have heard this, but I find very few people talking about how you actually do it if you are interested in learning how to write lock-free multi-threading code. So my question is besides learning all you can about threading, etc where do you start trying to learn to specifically write lock-free multi-threading code and what are some good resources. Cheers

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• MYSQL - Group by limit

  - by jono2010

  Hello Is there a simple way to LIMIT the GROUP BY results to the top 2. The following query returns all the results. Using 'LIMIT 2' reduces the overall list to the top 2 entries only. select distinct(rating_name), id_markets, sum(rating_good) 'good', sum(rating_neutral)'neutral', sum(rating_bad) 'bad' from ratings where rating_year=year(curdate()) and rating_week= week(curdate(),1) group by rating_name,id_markets order by rating_name, sum(rating_good) desc Results in the following :- poland 78 48 24 12 <- keep poland 1 15 5 0 <- keep poland 23 12 6 3 poland 2 5 0 0 poland 3 0 5 0 poland 4 0 0 5 ireland 1 9 3 0 <- keep ireland 2 3 0 0 <- keep ireland 3 0 3 0 ireland 4 0 0 3 france 12 24 12 6 <- keep france 1 3 1 0 <- keep france 231 1 0 0 france 2 1 0 0 france 4 0 0 1 france 3 0 1 0 Thanks Jon

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• Is it professional to have funny looking logging messages

  - by JCH

  Hi, Recently I have joined a new project team where in the java application logs have logged messages in a non-formal way[can't think of suitable word]. here how they look :-) <message> for info messages :-| <message> for warn :-( <message> for error besides there's also ASCII art drawing , different one for each log when that particular service starts up or is killed .And there many more styles for certain application events. iam not sure if it has any significant overhead on the application or not. I would like to ask you folks if you come across such unique styles of logging messages or do you also practice any styles.what is your opinion about it. BR /jon

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• C# -Closure -Clarification

  - by nettguy

  I am learning C#.Can I mean closure as a construct that can adopt the changes in the environment in which it is defined. Example : List<Person> gurus = new List<Person>() { new Person{id=1,Name="Jon Skeet"}, new Person{id=2,Name="Marc Gravell"}, new Person{id=3,Name="Lasse"} }; void FindPersonByID(int id) { gurus.FindAll(delegate(Person x) { return x.id == id; }); } The variable id is declared in the scope of FindPersonByID() but t we still can access the local variable id inside the anonymous function (i.e) delegate(Person x) { return x.id == id; } (1) Is my understanding of closure is correct ? (2) What are the aditional advantages can we get from closures?

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• Ugly thing and advantage of anonymos method -C#

  - by nettguy

  I was asked to explain the ugly thing and advantages of anonymous method. I explained possibly Ugly thing anonymous methods turning quickly into spaghetti code. Advantages We can produce thread safe code using anonymous method :Example static List<string> Names = new List<string>( new string[] { "Jon Skeet", "Marc Gravell", "David", "Bill Gates" }); static List<string> FindNamesStartingWith(string startingText) { return Names.FindAll( delegate(string name) { return name.StartsWith(startingText); }); } But really i did not know whether it is thread safe or not.I was asked to justify it. Can any one help me to understand (1) advantages of anonymous methods (2) Is the above code thread safe or not?

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• What is the worst programming mistake you have made?

  - by George Edison

  Most of us are not perfect. (Well, except Jon Skeet) Have you made a terrible mistake that you would like to share? The idea is that we could all learn from our mistakes and by collecting them together here, we can avoid some common ones and discover some no-so-common ones we may have overlooked. Oh, and this question is CW, of course. Edit: This question is different than http://stackoverflow.com/questions/1928002/what-is-the-worst-programming-mistake-you-have-ever-seen because we are sharing our own mistakes. Edit again: And this one http://stackoverflow.com/questions/130965/what-is-the-worst-code-youve-ever-written is different too - it asks for code. My question does not have that restriction!

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• What are your thoughts on a possible Developer's Television Network?

  - by Anthony Forloney

  I am a huge fan of informational television shows. Anytime I can learn something new by watching a television show, I am all for it. I wondered about how the community felt about a Developer Network for developers. What are the added advantages and disadvantages of having such a TV network? As an added bonus, what type of television shows should be aired on the network? Make up some fun and interesting television shows and elaborate. Also, for each television show, who could be a potential host? Jon Skeet for a C# television show? Phil Haack for an ASP.NET television show? I am looking forward to some interesting responses.

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• Known "Z notation" applications ?

  - by Amadeus45

  I was just remembering back my university classes and was wondering to know if anyone out here even used the "Z notation" in a professional environment. I honestly must say that it was the single most boring class that I have ever attended in my life. Maybe because of the teacher, but at the time we really all thought it was a big waste of time. I might have been wrong, which is why I'd like to hear you about it. If you are using it or some derived language (Z++), I'd just like to know how is it useful for you. Just curious to know some commonly-known applications of Z or your application. For those who are not familiar : http://staff.washington.edu/jon/z/z-examples.html

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• Do you have to install the REST starter kit in asp.net to access APIs?

  - by jonhobbs

  Hi, I'm currently trying to access a REST API for the first time using visual web developer 2008 express edition. Every article I have found says you have to install the WCF REST starter kit which is a .msi file, which would suggest that I have to install it on my machine and presumably our server too. My question is this. Is there a non installable version that I can use, e.g. just by dropping DLLs into the Bin directory and then using the classes contained. Or is there more to it than that and am I just getting very confused about how it works? Jon

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• How can I concatinate a subquery result field into the parent query?

  - by Pure.Krome

  Hi folks, DB: Sql Server 2008. I have a really (fake) groovy query like this:- SELECT CarId, NumberPlate (SELECT Owner FROM Owners b WHERE b.CarId = a.CarId) AS Owners FROM Cars a ORDER BY NumberPlate And this is what I'm trying to get... => 1 ABC123 John, Jill, Jane => 2 XYZ123 Fred => 3 SOHOT Jon Skeet, ScottGu So, i tried using AS [Text()] ... FOR XML PATH('') but that was inlcuding weird encoded characters (eg. carriage return). ... so i'm not 100% happy with that. I also tried to see if there's a COALESCE solution, but all my attempts failed. So - any suggestions?

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• make multiple, composite query in oracle

  - by Meloun

  How can i make multiple, composite query in oracle? for example this several queries in one step? 1 CREATE TABLE test (id NUMBER PRIMARY KEY, name VARCHAR2(30)); 2 CREATE SEQUENCE test_sequence START WITH 1 INCREMENT BY 1; 3 CREATE OR REPLACE TRIGGER test_trigger BEFORE INSERT ON test REFERENCING NEW AS NEW FOR EACH ROW BEGIN SELECT test_sequence.nextval INTO :NEW.ID FROM dual; END; 4 INSERT INTO test (name) VALUES ('Jon'); 5 INSERT INTO test (name) VALUES ('Meloun');

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• Is there any sense in performing binary AND with a number where all bits are set to 1

  - by n535

  Greetings everybody. I have seen examples of such operations for so many times that I begin to think that I am getting something wrong with binary arithmetic. Is there any sense to perform the following: byte value = someAnotherByteValue & 0xFF; I don't really understand this, because it does not change anything anyway. Thanks for help. P.S. I was trying to search for information both elsewhere and here, but unsuccessfully. EDIT: Well, off course i assume that someAnotherByteValue is 8 bits long, the problem is that i don't get why so many people ( i mean professionals ) use such things in their code. For example in Jon Skeet's MiscUtil there is: uint s1 = (uint)(initial & 0xffff); where initial is int.

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• ASP.NET Dates Deployment Issue

  - by Jonathan Stowell

  Hi guys, I recently bought some webspace with dailyrazor.com. I have deployed an application I have been working on to the server and am currently trying to workout the bugs but I can't seem to solve this one. I have set up my database in Visual Studio to use the one I have create with dailyrazor the same db the deployed version will use. I am using British Dates and on my localhost datetime is displayed: 27/05/2010 09:00 However on the dailyrazor host it is displayed: 5/27/2010 9:00 AM Short Dates e.g. 27/04/2010 display the same on both servers. This is causing some issues when entering data as errors occur on date fields. Any help would be appreciated. Thanks, Jon

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• How do I bind a Listview SelectedItem to a Textbox using the TwoWay mode?

  - by Nick U

  I am very new to WPF and testing some things that I would like to include in an application that I will be working on. I have a 2 row ListView (bound to a textbox) with the names Scott Guthrie and Jon Skeet in it. I am trying to select "Scott Guthrie" in the ListView and have it populate the TextBox. I want to be able to edit the text and tab off and have the ListView updated. Edit:I removed the code since that really didn't add anything to the question.

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• ASP.net error message when using REST starter kit

  - by jonhobbs

  Hi all, I've written some code using the REST starter kit and it works fine on my development machine. However, when I upload it to our server the page gives me the following error message... CS1684: Warning as Error: Reference to type 'System.Runtime.Serialization.Json.DataContractJsonSerializer' claims it is defined in 'c:\WINNT\assembly\GAC_MSIL\System.ServiceModel.Web\3.5.0.0__31bf3856ad364e35\System.ServiceModel.Web.dll', but it could not be found I've removed code line by line and it appears that the following line of code is triggering the error... HttpContent newOrganizationContent = HttpContentExtensions.CreateXmlSerializable(newOrganizationXml); Really haven't got a clue how to fix it. I assumed it might be because it needs a newer version of the framework to run, but looking in IIS it says it's running version 2.0.50727 which I think is the lates version because it says that even when we're using framework 3.5 Very confused, any ideas? Jon

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• system requirements for Visual Studio 2010

  - by user110182

  My team is currently using VS2005 with the following development PCs that are a few years old: XP, Pentium D 2.8GHz, 2GB RAM. My gut tells me that this is going to be poor hardware for VS2010 development. I am not running VS2010 beta but I am running Blend 3 beta and the performance is bad. Can you point me to anything that I can show my boss to convince him to buy 6 new machines for my team? Edit below after initial answer from Jon: I should have added that my boss wants to upgrade current machines with new hard-drives so I am trying to use this opportunity to take a look forward and see if a HD upgrade is really worth it. This HD upgrade would not just be simple installation of 2nd drive but would replace current drive and would involve backup/restore or reinstallation headaches. There would be the added benefit of 64bit development too, something that we have been talking about.

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• stored procedure to find value in 2 columns out of 3

  - by user1510533

  I am putting in the samle date and i am supposed to do something similar what i am asking. I want to run a query that would pull values in any two columns out 3 if it has a 1 or if any one column has a 1 it will return just those results. However it should search all three columns and in any of the three columns where it found value as 1 it should return that result. Can anyone please help me with this. Thanks in advance. ID Patient Patient Name prio prio2 prio3 ------------------------------------------------- 1 101563 Robert Riley 1 1 1 2 101583 Cody Ayers 1 0 1 3 101825 Jason Lawler 0 0 1 4 101984 Dustin Lumis 1 0 0 5 102365 Stacy smith 1 0 0 6 102564 Frank Milon 1 0 0 7 102692 Thomas Kroning 1 0 0 8 102856 Andrew Philips 1 0 0 9 102915 Alice Davies 0 0 1 10 103785 Jon Durley 0 0 1 11 103958 Clayton Folsom 1 1 1 12 104696 Michelle Holsley 1 1 1 13 104983 Teresa Jones 1 0 1 14 105892 Betsy Prat 1 1 0 15 106859 Casey Ayers 1 1 0

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• Fitch Format Proofs - any resources around?

  - by devoured elysium

  I am currently studying Fitch Format first order logic proofs. My lecturer follows closely Language, Proof and Logic by Jon Barwise. I am trying to do some proofs but I am having some trouble getting to understand how to do these proofs. As I have already read what Language Proof and Logic has to offer, I'd like to know if there are any other books or resources around that use the Fitch format for their formal proofs. Plus, having solved exercises would be of great(!) help. Thanks

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• Which browsers support font embedding.

  - by jonhobbs

  I've been reading about the @font-face rule and trying to work out if it's worth using it in a project to render "franklin gothic medium" for title instead of something like sIfr. I figured that for browsers that don't support it I could make it fall back on Arial. The thing is that I'm having trouble getting a definitive answer about which browsers support embedding fonts in this way. So far I've worked out the IE does, but doesn't support .ttf files. Other browsers I'm not sure. If anyone could point me towards some kinf of compatibility chart that would be great. Jon

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