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• Linq ChangeConflictException occurs when submitting DataContext changes

  - by Alex

  System.Data.Linq.ChangeConflictException: 2 of X updates failed. at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode) at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode) at PROJECT.Controllers.HomeController.ClickProc(Int32 id, String code, String n) This is what I get very often. This action is done thousands of times a day, and I get this exception about once every 5 seconds. From what I understand it happens when something changes in the database in the period between creating DataContext and updating it. Am I right? How can I fix it? Update I just debugged the error and found the following: Table name: dbo.Stats current value: 9852039 original value: 9852038 database value: 9852039 The Stats table is updated constantly. So how can I still make LINQ save the changes. With "classical" SQL Server access through SqlDataCommand I never had problems like that.

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• Is *not* using the asp.net membership provider a bad idea?

  - by EJB

  Is it generally a really bad idea to not use the built-in asp.net membership provider? I've always rolled my own for my asp.net apps (public facing), and really have not had any problems in doing so. It works, and seems to avoid a layer of complexity. My needs are pretty basic: once setup, the user must use email address and password to login, if they forget it, it will be emailed back to them (a new one). After setup there is little that needs to be done to each user account, but I do need to store several extra fields with each user (full name, telephone and a few other fields etc). The number of users that required login credentials are small (usually just the administrator and a few backups), and everyone else uses the site unauthenticated. What are the big advantages that I might be missing out on by skipping the asp.net membership provider functionality?

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• Split string on non-alphanumerics in PHP? Is it possible with php's native function?

  - by Jehanzeb.Malik

  I was trying to split a string on non-alphanumeric characters or simple put I want to split words. The approach that immediately came to my mind is to use regular expressions. Example: $string = 'php_php-php php'; $splitArr = preg_split('/[^a-z0-9]/i', $string); But there are two problems that I see with this approach. It is not a native php function, and is totally dependent on the PCRE Library running on server. An equally important problem is that what if I have punctuation in a word Example: $string = 'U.S.A-men's-vote'; $splitArr = preg_split('/[^a-z0-9]/i', $string); Now this will spilt the string as [{U}{S}{A}{men}{s}{vote}] But I want it as [{U.S.A}{men's}{vote}] So my question is that: How can we split them according to words? Is there a possibility to do it with php native function or in some other way where we are not dependent? Regards

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• How to prevent maven to resolve dependencies in local repository

  - by Nils Schmidt

  Is there a way to tell maven (when doing mvn package, mvn site or ...) not to resolve the dependencies from the local repository? Background of this question: Sometimes I get into problems, when previously cached dependencies (e.g. SomeProject-0.7-ALPHA) are no longer available in the remote repository. In my local build everything still works fine as the dependency has been cached before. As soon as I share my pom with others, they may get into trouble, as they dont have a cached version of that dependency and the dependency can no longer be resolved from the remote repository. Any help will be appreciated. Thanks in advance!

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• Can I using cross-site XmlHttpRequest in Itunes LP environment?

  - by jameulrich

  Itunes is based on Webkit platform and we can't use cross-site XmlHttpRequest in JavaScript because of security policy. But, as a exception, we can do that with a special header. Here is source code and I did it successfully in Safari: /////////////// var url = 'http://mysite.net/canvas.php'; var mybody = "Arun"; var http = new XMLHttpRequest(); http.open("POST", url, true); http.setRequestHeader("X-PINGOTHER", "pingpong"); http.setRequestHeader('Content-Type', 'application/xml'); http.setRequestHeader("Content-length", mybody.length); http.setRequestHeader("Connection", "close"); http.send(mybody); /////////////// I sent xml data to my server and get return response successfully in Safari browser but i can't do it in iTunes LP environment. So what is the problems?

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• Microsoft chart images are not loaded from MOSS server

  - by hd

  hi, i have webpage in which a webpart contains a Chart control. the problem is chart control is rendered perfectly when i login as central admin. but when i login as another user with contribute permisson following problems occur. when i change webconfig as --- add key="ChartImageHandler" value="storage=file;timeout=20;dir=c:\TempImageFiles\;"--- page is not at all loaded. i get error like YOU ARE NOT AUTHORIZED TO VIEW THIS PAGE. when i change the wbconfig as --- add key="ChartImageHandler" value="storage=memory;timeout=20;URL=/_layouts/Images/MicrosoftChartControls/" --- the page loads fine but image is not rendered. A red mark appears in place of image. I tried all optins got by googling.. any more suggestions/help will be welcomed

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• Firefox jquery flicker bug problem

  - by Dan

  This is possibly a really silly question but I've stared at this code way too long for it to make sense! I'm having problems with a flicker of the screen in firefox; It is related a filtering script... I have a website that is a one page vertical scroll; with different anchors to define sections and a smooth scroll script to make it pretty... See the example here: http://tiny.cc/7g5mn I've tried everything... Please help me, I'm begging you, my eyes hurt!

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• fancybox encoding issue

  - by Noam Smadja

  i am using fancybox.net for my light boxes. it works great with images. but when i use iframe option i am having problems with encoding. i use hebrew and english and russian on my website. when i use UTF-8 on the iframe page i get squares instead of hebrew letters. when i change to iso-8859-8 i have hebrew but inverted, and russian goes: ??????????? any idea? my website is UTF-8 and every thing works great.. except fancybox :(

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• Why MSSQL keeps throwing me Exceptions?

  - by Augusto Càzares

  I have my project in .NET that uses a db in MSSQL Server,i'm using LINQ , sometimes when the projec throws me an exception (Constraint) in a part of the project this same error keeps showing in other part of the project when i do another thing with the db, like when i do an insertion and i had before an exception on delete the insertion throws me the delete exeption, and it remainds this way until i close and open again the project, my major problem is when this happen in my online project, this error in my project causes me problems in the project i'm testing online (i use the same db). I don't know if this exception is on the memory or something but its have been causing me a lot of headechs.

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• Can I send a ESC d command to a POS printer from perl?

  - by Bradleyb

  I have a Star TSP100 printer and I'm having few problems with it really. My problem is that I'm not as familiar with programming as I should be - but I'm learning! The programmers reference for the Star printer says that if I send a ESC d to the printer - that will activate the built-in cutter - which I would like to do very much. My problem is that I have no idea how to send an escape code like that from within PERL - if it's even possible. I really appreciate any advice on this one.

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• Is problem solving of puzzles/logic tests a skill that can be developed with practise or only someth

  - by dotnetdev

  Programming is essentially problem solving/using a lot of logic. With solving puzzles (like the ones recruiters like MS etc ask), is this a skill that can be developed with practise or is it a skill that only someone who is gifted has (I assume the former as many people can pass these tests)? Even so, I keep thinking it is a special skill for someone gifted, not for someone with a lot of practise. I guess that with practise you are perhaps more open-minded and start to think out of the box more (solving technical problems in development may also foster this mindset perhaps). Thanks

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• Django paging object has issues with Postgresql QuerySets

  - by pivotal

  I have some django code that runs fine on a SQLite database or on a MySQL database, but it runs into problems with Postgres, and it's making me crazy that no one has has this issue before. I think it may also be related to the way querysets are evaluated by the pager. In a view I have: def index(request, page=1): latest_posts = Post.objects.all().order_by('-pub_date') paginator = Paginator(latest_posts, 5) try: posts = paginator.page(page) except (EmptyPage, InvalidPage): posts = paginator.page(paginator.num_pages) return render_to_response('blog/index.html', {'posts' : posts}) And inside the template: {% for post in posts.object_list %} {# some rendering jazz #} {% endfor %} This works fine with SQLite, but Postgres gives me: Caught TypeError while rendering: 'NoneType' object is not callable To further complicate things, when I switch the Queryset call to: latest_posts = Post.objects.all() Everything works great. I've tried re-reading the documentation, but found nothing, although I admit I'm a bit clouded by frustration at this point. What am I missing? Thanks in advance.

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• How to not have .axd files authenticate in IIS7

  - by AndyV

  We recently moved from IIS6 to IIS7 and we're experiencing some issues. The nastiest seems to be that .axd files being handled differently in IIS7. They're run through the pipeline for the authentication and authorization modules as well as the global.asax events. This causes problems for a variety of reason (specific to our code) that won't go into. How can we just exclude .axd files from all this like they were in IIS6? Thanks. Note: We're still in 32bit Classic pipeline mode.

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• Best performance approach to history mechanism?

  - by Royi Namir

  We are going to create History Mechanism for our changes in DB (DART in pic) via Triggers. we have 600 tables. Each record that will be changed - the trigger will insert the deleted one into XXX. regarding to the XXX : option 1 : clone each table in "Dart" DB and each table now will have a "sister table" e.g. : Table1 will have Table1_History problems : we will have 1200 tables programmer can do mistakes by working on wrong tables... option 2 : make a new DB (DART_2005 in pic) and the history tables will be there option 3 : use linked server which stores the Db which will contain the history tables. question : 1) which option gives the best performance ( I guess 3 is not - but is it 1 or 2 or same ?) 2) Does option 2 is acting like "linked server" ( in queries we will need to select from both DB's...) 3) What is the best practice approach ?

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• Warning as Error - How to rid these

  - by coffeeaddict

  I cannot figure out how to get rid of errors that basically should not be halting my compile in VS 2010 and should not be show stoppers, or at least I will fix them later but I don't want the compile to just error and halt on these kinds of problems. For example I'm getting the following error: Error 1 Warning as Error: XML comment on 'ScrewTurn.Wiki.SearchEngine.Relevance.Finalize(float)' has a paramref tag for 'IsFinalized', but there is no parameter by that name C:\www\Wiki\Screwturn3_0_2_509\SearchEngine\Relevance.cs 60 70 SearchEngine for this code: /// /// Normalizes the relevance after finalization. /// /// The normalization factor. /// If is false ( was not called). public void NormalizeAfterFinalization(float factor) { if(factor < 0) throw new ArgumentOutOfRangeException("factor", "Factor must be greater than or equal to zero"); if(!isFinalized) throw new InvalidOperationException("Normalization can be performed only after finalization"); value = value * factor; } I looked in Tools | Options and I don't see where I can tweak the compiler and tell it not to worry about comment or XHTML based errors.

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• Rails belongs_to issue in the views

  - by Jacobo Tibaquira

  Hi, Im having problems with an association in rails: Currently I have Post and User models, and the relationship is set this way: class User < ActiveRecord::Base attr_accessible :username, :name, :lastname has_many :posts end class Post < ActiveRecord::Base attr_accessible :title, :body belongs_to :user end However, in my app/views/posts/index.html.haml when Im trying to access the username for the post I get this error: undefined method `name' for nil:NilClass This is my view: - title "Posts" %table %tr %th Title %th Body %th Author - for post in @posts %tr %td= h post.title %td= h post.body %td= h post.user.name %td= link_to 'Show', post %td= link_to 'Edit', edit_post_path(post) %td= link_to 'Destroy', post, :confirm => 'Are you sure?', :method => :delete %p= link_to "New Post", new_post_path Any thoughts of what Im doing wrong will be appretiated

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• GridView in UpdatePanel adds extra rows when sorting another grid

  - by chopps

  Hey Everyone, I'm a seeing some weird behavior that i have never seen before. I have two grid in separate UpdatePanels. I can page and sort each without any problems. Each grid is set for 10 per page. If the first grid (13 records) is paged to the second page and then i go down to the second grid (14 records) and page to the next page and the first grid adds a bunch of empty rows to the grid so it is full to show 10. There is no data in the rows...just empty rows. Each grid does this on paging and sorting. Ive stepped through the code and the the loading of the other grids never happens so it tells my AJAX is doing something to add the 'phantom' rows to the grid. Any ideas why or ways to debug this?

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• Background image for navigation view (iPhone)

  - by Mladen

  Hi Guys, I am having problems with properly displaying background image of navigation view. Here is the pic: Here is the code: (id)initWithStyle:(UITableViewStyle)style { if (self = [super initWithStyle:style]) { UIImage *image = [UIImage imageNamed: @"bg_table_active.png"]; UIImageView *imageview = [[UIImageView alloc] initWithImage: image]; UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Settings", @"") style:UIBarButtonItemStyleDone target:self action:@selector(GoToSettings)]; self.navigationItem.titleView = imageview; self.navigationItem.rightBarButtonItem = addButton; self.navigationItem.hidesBackButton = TRUE; } return self; } How to make the picture stretch to whole navigation view?

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• Do people create and use Web Parts connections?

  - by Javaman59

  I've been writing some SharePoint web parts wich connect (as providers and consumers). I've found many difficulties, and (comparatively*) little material from the web, from books, or from microsoft.com, which is quite surprising as Web Parts have been around since 2003. This is making me think that although web part connections look like a first class feature in SharePoint, that in practice few people write connecting web parts, and few SharePoint users use them. Is this the case - that few developers write connecting web parts, and few users use them? *comparitively: A subjective impression. With each specific problem i usually find only a handful of web pages which address it, and as my problems seem to be fundamental ones (such which data type to wrap in an IWebPartRow), I expect a lot more search results.

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• Problem saving excel file after inserting data

  - by Cmptrb

  Hi, I want to write data to an existing excel file ( I do it easily ) But I can not save the changes on the excel file ( actually I see the changes on the excel file, but it seems opened and after all it occurs some problems such as "the file is already opened with same name and so on ... ) Excel.Application app= new Microsoft.Office.Interop.Excel.Application(); Excel.Workbook appbook= app.Workbooks.Open(appxls, 0, true, 5, "", "", false, Excel.XlPlatform.xlWindows, "\t", true, false, 0, true, Missing.Value, Missing.Value); Excel.Sheets pages= appbook.Worksheets; Excel.Worksheet page= (Excel.Worksheet)pages.get_Item(1); //... i change some values on the excel file and want to save them : // appxls is a string holding the path appbook.SaveAs(appxls, Excel.XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing,false, Type.Missing, Excel.XlSaveAsAccessMode.xlShared, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); appbook.Close(true, Missing.Value, Missing.Value); app.Quit(); Where is the problem, how can I solve it using Microsoft.interop.

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• AVD Failed to Load ~ Failed to Parse Properties ~ Mac OSX

  - by C.D. OKeefe

  I'm going to say upfront, please forgive me. I'm a newbie to android development and fairly new to programming. Also on a Mac. You're going to have to talk...real...slow. I can't get an AVD to load. I've tried it from Eclipse and from the Android SDK Manager. Failed multiple times. Received the same error each time, "Failed to parse properties from Users/myname/.android/avd/nameIGaveEmulator/config.ini." I've the forum here and saw that others have had similar problems, but of the answers given, no one came back to say if they worked, and I don't see anyone with a similar problem on a Mac. If the path needs to be "changed" what exactly does that mean and how do I go about doing so?

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• Validate an XML File Against Multiple Schema Definitions

  - by Jon

  I'm trying to validate an XML file against a number of different schemas (apologies for the contrived example): a.xsd b.xsd c.xsd c.xsd in particular imports b.xsd and b.xsd imports a.xsd, using: <xs:include schemaLocation="b.xsd"/> I'm trying to do this via Xerces in the following manner: XMLSchemaFactory xmlSchemaFactory = new XMLSchemaFactory(); Schema schema = xmlSchemaFactory.newSchema(new StreamSource[] { new StreamSource(this.getClass().getResourceAsStream("a.xsd"), "a.xsd"), new StreamSource(this.getClass().getResourceAsStream("b.xsd"), "b.xsd"), new StreamSource(this.getClass().getResourceAsStream("c.xsd"), "c.xsd")}); Validator validator = schema.newValidator(); validator.validate(new StreamSource(new StringReader(xmlContent))); but this is failing to import all three of the schemas correctly resulting in cannot resolve the name 'blah' to a(n) 'group' component. I've validated this successfully using Python, but having real problems with Java 6.0 and Xerces 2.8.1. Can anybody suggest what's going wrong here, or an easier approach to validate my XML documents?

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• compile error: The import xxxx cannot be resolved

  - by Zachary

  I am developing a Java project using Eclipse. The project uses another project called engine, which I have added in my project build-path. As I need to call a dabo class, called House, in one of my project class, named Window, I have used the following code as usual: import ee.asus.kernel.House; I got however the following error in compiling time: Exception in thread "main" java.lang.Error: Unresolved compilation problems: The import ee cannot be resolved House cannot be resolved to a type House cannot be resolved to a type House cannot be resolved to a type at main.ee.asus.GUI.FrameWindow.Window.<init>(Window.java:10) at main.ee.asus.GUI.StartApplication.main(StartApplication.java:13) It's worth to point out that my prject and the dabo project use the same directory/packages names. Does anyone have a clue where the error may be?

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• Form still posts back with return false in JS

  - by jiewmeng

  it seems like #frmToDo still posts backs <form id="frmToDo" name="frmToDo"> ... <a id="btnSubmit" href="javascript:document.frmToDo.submit();">Add</a> google.load("jquery", 1); google.load("jqueryui", 1); google.setOnLoadCallback(function() { ... $("#frmToDo").submit(function() { return false; ... why will this happen? might it be because of href="javascript:document.frmToDo.submit(). how can i submit the form with that link (i didnt use <input type="submit" /> because of styling problems, it seems like buttons are harder to style, esp in different browsers) the AJAX way?

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• TFS no release folder in build folder

  - by brian b

  I have a tfs build that works fine on the client, but when executed on the server, no actual binaries get created. When I go to the folder: \[MyServer]\builds[BuildName], I see BuildLog.txt ErrorsWarningsLog.txt Release.txt I expect to see a big \Release folder full of my dlls, but I get nothing. The error log reports no problems up until we ask the build to copy the binaries to our staging server. If I comment those out, I get no errors. CustomizableOutDir is true, DropLocation is set to something sensible BuildDirectoryPath is set to something sensible But no matter what, I just don't get any dlls built. Our local TFS guy is baffled too. Any suggestions?

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