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• Data Structure for a particular problem??

  - by AGeek

  Hi, Which data structure can perform insertion, deletion and searching operation in O(1) time in the worst case. We may assume the set of elements are integers drawn from a finite set 1,2,...,n, and initialization can take O(n) time. I can only think of implementing a hash table. Implementing it with Trees will not give O(1) time complexity for any of the operation. Or is it possible?? Kindly share your views on this, or any other data structure apart from these.. Thanks..

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• Three level heirarchal data-linq

  - by user326010

  Hi I have three level heirarchal data. using the statement below i managed to display two level data. I need to extend it to one more level. Current heirachy is Modules--Documents I need to extend it as Packages--Modules--Documents var data = (from m in DataContext.SysModules join d in DataContext.SysDocuments on m.ModuleID equals d.ModuleID into tempDocs from SysDocument in tempDocs.DefaultIfEmpty() group SysDocument by m).ToList(); Regards Tassadaque

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• Setup and Deployment does not work

  - by cmrhema

  Hi, I am working on VS 2008 and 3.5 framework. I had three windows services. I placed all three in a single solution, created installer individually for each of them. Then created a setup project. When I build it says build failed . But I checked on the errorlist, (i enabled the diagnostics in options menu), but there was no error at all. I went ahead and installed. There were no issues, But there was no service showed up in the services.msc. I installed each service individually , using installutil command, it showed up. But my requirement is to bundle these services and deploy to the client. The client should install it. Where am I going wrong. Any inputs will be highly appreciated. Regards cmrhema

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• How to get Extjs.data.store data with json format with POST method

  - by user287093

  Hi experts, How can i send the Ext.data.store's array to server side in json type??? thanks

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• Adding single row one by one in tableview from core data of iPhone

  - by user336685

  I am working on RSS reader code where articles get downloaded and are viewable offline. The problem is only after all articles are downlaoded the tableview containing headlines gets updated. Core data is used. So everytime NSobjectcontext is saved , [self tableview updatebegins ] is called.The table is getting updated via fetchcontroller core data. I tried saving NSobjectcontext everytime an article is saved but that is not updating the tableview. I want a mechanism similar to instapaper tableview where articles get saved and tableview gets updated immediately. Please help if you know the solution. Thanks in advance.

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• Bitwise operators versus .NET abstractions for bit manipulation in C# prespective

  - by Leron

  I'm trying to get basic skills in working with bits using C#.NET. I posted an example yesterday with a simple problem that needs bit manipulation which led me to the fact that there are two main approaches - using bitwise operators or using .NET abstractions such as BitArray (Please let me know if there are more build-in tools for working with bits other than BitArray in .NET and how to find more info for them if there are?). I understand that bitwise operators work faster but using BitArray is something much more easier for me, but one thing I really try to avoid is learning bad practices. Even though my personal preferences are for the .NET abstraction(s) I want to know which i actually better to learn and use in a real program. Thinking about it I'm tempted to think that .NET abstractions are not that bad at, after all there must be reason to be there and maybe being a beginner it's more natural to learn the abstraction and later on improve my skills with low level operations, but this is just random thoughts.

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• Force php through the .net engine in iis7

  - by Rippo

  I have converted a php to asp.net mvc and have it hosted with the Rackspace cloud. All works great apart from some php links are still linked from other sites and within search engines. My question is what do I need to add to my web.config to force php sites to go through the .net engine? These links work as expected as I can catch the 404 and redirect where need be:- http://www.securahome.net/myjunk.info http://www.securahome.net/myjunk.phpp However this one doesn't:- http://www.securahome.net/myjunk.php I have spoken to Rackspace cloud and they say "its not possible as IIS doesn't recognize php files. You can setup mime types to handle them" This however makes no sense and I think they did not understand the problem. Does anyone have a solution?

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• Why would one use REST instead of Web services?

  - by AngryHacker

  Attended an interesting demo on REST today, however, I couldn't think of a single reason (nor was one presented) why REST is in anyway better or simpler to use and implement than a Web Services stack. What are some of the reasons Why anyone in the "real world" use REST instead of the Web Services?

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• Weird compatibility problem with .Net 3.5 and 4.0 assemblies (NATUPnPLib)

  - by Juha

  I'm having trouble getting NATUPnP 1.0 Type Library to work with Framework 3.5 in Visual Studio 2010. If I use .Net 4.0, it works just fine, but with .Net 3.5, NATUPNPLib's namespace looks excactly like NETCONLib's. For example this Port Forwarding Management Application sample from this site: http://pietschsoft.com/post/2009/02/05/NET-Framework-Communicate-through-NAT-Router-via-UPnP.aspx ..is using .Net 3.5, but I can't get it to compile in Visual Studio 2010 unless I change it to .Net 4.0. I haven't tried, but I bet in Visual Studio 2008 there would be no problems.

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• Core Data and BOOL setup

  - by John Valen

  I am working on an app that uses Core Data as its backend for managing SQLite records. I have everything working with strings and numbers, but have just tried adding BOOL fields and can't seem to get things to work. In the .xcdatamodel, I have added a field to my object called isCurrentlyForSale which is not Optional, not Transient, and not Indexed. The attribute's type is set to Boolean with default value NO. When I created the class files from the data model, the boilerplate code added for this property in the .h header was: @property (nonatomic, retain) NSNumber * isCurrentlyForSale; along with the @dynamic isCurrentlyForSale; in the .m implementation file. I've always worked with booleans as simple BOOLs. I've read that I could use NSNumber's numberWithBool and boolValue methods, but this seems like an aweful lot of extra code for something so simple. Can the @property in the header be changed to a simple BOOL? If so is there anything to watch out for? Thanks -John

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• NET Framework Validation Library

  - by Kane

  As I see it most applications have a requirement for some form of validation and a number of fantastic free offerings are available (I.E., Fluent Validation, Validation Block, Spring, Castle Windsor, etc). My question is why does the .NET Framework not include any inbuilt validation libraries? I am aware the .NET Framework allows a developer the ability to build their own validation libraries/methods/etc. and anything provided as part of the .NET Framework would not always meet everyone’s needs. But surely something could have been included? ASP.NET has a minimal set of validators but these have not really been extended since .NET 2.0 was released.

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• AutoComplete implementation - Interview Question

  - by user181218

  Hi, Say you have a DB table with two cols: SearchPhrase(String) | Popularity(Int). You need to initialize a DS so that you could use it to implement an autocomplete feature (like google suggest) comfortably. The requirement: Once the data from the db is processed into the data structure, when you type a letter you get the 10 most popular searchphrases from the db starting with that letter,then when you type the next one you get the 10 .... with these two letters and so on. The question only concerns planning the ds and pseudocoding Insert,Search etc. Note: YOU CANNOT USE TRIE DS. Any ideas?

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• Returning data from SQL Server reporting web service call

  - by user79339

  Hi, I am generating a report that contains the version number. The version number is stored in the DB and retrieved/incremented as part of the report generation. The only problem is, I am calling SSRS via a web service call, which returns the generated report as a byte array. Is there any way to get the version number out of this generated report? For example to display a dialog that says "You generated Status Report, Version number 3". I tried passing in an output parameter and setting it inside the storedproc. Its modified when i execute it in sql management studio, but not in the reporting studio. Or atleast i can't seem to bind to the modified, post execution value (using expression "=Parameters!ReportVersion.Value"). Of course, I could get/increment the version number from database myself before calling the SSRS webservice and pass it along as a parameter to the Report, but that might cause concurrancy problems. On the whole, it just seems neater for the storedproc to access/generate a version number and return it to the ReportingEngine, which will generate the report with the version number and return the updated version number to the WebService client. Any thoughts/Ideas?

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• CSS-Friendly Menu adapter that emits the same markup as .NET 4.0

  - by Joe

  For .NET 2.x/3.x there exists a CSS-Friendly Adapter on CodePlex that emits markup for an ASP.NET Menu Control as an ul. The .NET 4.0 Menu control will also emit an ul, but the CSS class names are different from those emitted by the CSS-Friendly Adapter 1.0 on CodePlex. In the interests of having a single version of CSS for .NET 2/3/4 sites, I want to create a version of the CSS-Friendly menu adapter that emits the same markup as the .NET 4.0 Menu control. Before doing so, I thought I'd ask here to see if it's already been done, so I don't reinvent the wheel. Anyone?

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• Best way to collect and store data daily?

  - by mktb

  I have a bunch of statistics: # of users, # of families, ratio user/family, etc. I'd like to store these daily so I can view this data historically. However, I'm looking for the most effective way to store this data. Should I run a cron job that writes to the database DATE: today USERS: 123 FAMILIES: 456 RATIO: 7.89 or whatever? (or should I write multiple rows like DATE: today DATATYPE: users VALUE: 123?) Or is there another option I can use that is more efficient or more effective? Thanks!

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• iOS 5 - Coredata Sqlite DB losing data after killing app

  - by Brian Boyle

  I'm using coredata with a sqlite DB to persist data in my app. However, each time I kill my app I lose any data that was saved in the DB. I'm pretty sure its because the .sqlite file for my DB is just being replaced by a fresh one each time my app starts, but I can't seem to find any code that will just use the existing one thats there. It would be great if anyone could point me towards some code that could handle this for me. Cheers B - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (__persistentStoreCoordinator != nil) { return __persistentStoreCoordinator; } NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"FlickrCoreData.sqlite"]; NSError *error = nil; __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return __persistentStoreCoordinator; }

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• Entity Framework insert error ("The Version field is required.")

  - by Graham

  I am using Silverlight 4 and RIA services. When I try to insert into my database, I get the following error: "Submit operation failed validation. Please inspect Entity.ValidationErrors for each entity in EntitiesInError for more information." Upon inspecting the ValidationErrors, I see: "The Version field is required." Isn't the Version field updated and maintained by the framework? If so, why is it null? If not, how am I supposed to set it?

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• JSON.Stringify data including boolean values

  - by ancdev

  What I'm trying to do is to pass JSON object to a WebAPI ajax call and mapped to a strongly typed object on the server side. String values are being posted perfectly however when it comes to boolean values, they are not being passed at all. Below is my code: var gsGasolineField = $('.gsGasoline').val(); blData = { Gasoline: gsGasolineField }; var json = JSON.stringify(blData); $.ajax({ type: "POST", url: url, data: json, contentType: "application/json", dataType: "json", statusCode: { 201 /*Created"*/: function (data) { $("#BusinessLayerDialog").dialog("close"); ClearForm("#BusinessLayerForm"); }, 400: /*Bad request - validation error*/ function (data) { $("#BusinessLayerForm").validate().form(); }, 500: function (data) { alert('err'); } }, beforeSend: setHeader }); Gasoline property is of type boolean on the server side.

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• Data Warehouse: One Database or many?

  - by drrollins

  At my new company, they keep all data associated with the data warehouse, including import, staging, audit, dimension and fact tables, together in the same physical database. I've been a database developer for a number of years now and this consolidation of function and form seems counter to everything I know. It seems to make security, backup/restore and performance management issues more manually intensive. Is this something that is done in the industry? Are there substantial reasons for doing or not doing it? The platform is Netezza. The size is in terabytes, hundreds of millions of rows. What I'm looking to get from answers to this question is a solid understanding of how right or wrong this path is. From your experience, what are the issues I should be focused on arguing if this is a path that will cause trouble for us down the road. If it is no big deal, then I'd like to know that as well.

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• C# to unmanaged dll data structures interop

  - by Shane Powell

  I have a unmanaged DLL that exposes a function that takes a pointer to a data structure. I have C# code that creates the data structure and calls the dll function without any problem. At the point of the function call to the dll the pointer is correct. My problem is that the DLL keeps the pointer to the structure and uses the data structure pointer at a later point in time. When the DLL comes to use the pointer it has become invalid (I assume the .net runtime has moved the memory somewhere else). What are the possible solutions to this problem? The possible solutions I can think of are: Fix the memory location of the data structure somehow? I don't know how you would do this in C# or even if you can. Allocate memory manually so that I have control over it e.g. using Marshal.AllocHGlobal Change the DLL function contract to copy the structure data (this is what I'm currently doing as a short term change, but I don't want to change the dll at all if I can help it as it's not my code to begin with). Are there any other better solutions?

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• Login fails after upgrade to ASP.net 4.0 from 3.5

  - by lomac

  I cannot log in using any of the membership accounts using .net 4.0 version of the app. It fails like it's the wrong password, and FailedPasswordAttemptCount is incremented in my_aspnet_membership table. (I am using membership with mysql membership provider.) I can create new users. They appear in the database. But I cannot log in using the new user credentials (yes, IsApproved is 1). One clue is that the hashed passwords in the database is longer for the users created using the asp.net 4.0 version, e.g 3lwRden4e4Cm+cWVY/spa8oC3XGiKyQ2UWs5fxQ5l7g=, and the old .net 3.5 ones are all like +JQf1EcttK+3fZiFpbBANKVa92c=. I can still log in when connecting to the same db with the .net 3.5 version, but only to the old accounts, not the new ones created with the .net 4.0 version. The 4.0 version cannot log in to any accounts. I tried dropping the whole database on my test system, the membership tables are then auto created on first run, but it's still the same, can create users, but can't log in.

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• iPhone app launch times and Core Data migration

  - by sehugg

  I have a Core Data application which I plan to update with a new schema. The lightweight migration seems to work, but it takes time proportional to the amount of data in the database. This occurs in the didFinishLaunchingWithOptions phase of the app. I want to avoid <app> failed to launch in time problems, so I assume I cannot keep the migration in the didFinishLaunchingWithOptions method. I assume the best method would involve performing the migration in a background thread. I assume also that I'd need to defer loading of the main ViewController until the loading completes to avoid using the managedObjectContext until initialization completes. Does this make sense, and is there example code (maybe in Apple sample projects) of this sort of initialization?

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• SSRS chart does not show y-axis data labels when values are very small (<1)

  - by SQL Baba

  I have chart that plots values of Y-axis less than 1 (0.1, 0.24, etc). When the chart is built, Y-axis label just shows 0 at the origin and no other values along the axis.

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• .NET Framework Class Library Documentation

  - by T G Trese

  Developing in .NET 3.5. Recently my well-worn link to the .NET Framework 3.5 Class Library documentation (http://msdn.microsoft.com/en-us/library/ms229335.aspx) started taking me to the .NET 4.0 docs. This is a bit of a nuisance, because I'm not interested in .NET 4.0 (yet)--the project I'm working on is in 3.5. Previous versions of the .NET Class Library docs provided links to older versions; these don't appear to be present any more in 4.0 docs. And I can't seem to locate the 3.5 docs anywhere on MSDN. Does anyone know where these are located. Or (better) where I can download a static copy of the Class Library docs (something conveniently available with Java API javadocs) that Microsoft can't hide? Many thanks in advance.

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• Core Data produces Analyzer warnings

  - by RickiG

  Hi I am doing the final touch ups on an app and I am getting rid of every compiler/analyzer warning. I have a bunch of Class methods that wrap my apps access to Core Data entities. This is "provoking" the analyzer. + (CDProductEntity*) newProductEntity { return (CDProductEntity*)[NSEntityDescription insertNewObjectForEntityForName:@"CDProductEntity" inManagedObjectContext:[self context]]; } Which results in an Analyzer warning: Object with +0 retain counts returned to caller where a +1 (owning) retain count is expected In the method that calls the above Class Method I have this: CDProductEntity *newEntity = [self newProductEntity]; Which results in an Analyzer warning: Method returns an Objective-C object with a +1 retain count (owning reference) Explicitly releasing or autoreleasing a Core Data entity is usually very very bad, but is that what it is asking me to do here? First it tells me it has a +0 retain count and that is bad, then it tells me it has a +1 which is also bad. What can I do to ensure that I am either dealing with a Analyzer hiccup or that I release correctly? Thanks in advance

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