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  • Cloud Fact for Business Managers #3: Where You Data Is, and Who Has Access to It Might Surprise You

    - by yaldahhakim
    Written by: David Krauss While data security and operational risk conversations usually happen around the desk of a CCO/CSO (chief compliance and/or security officer), or perhaps the CFO, since business managers are now selecting cloud providers, they need to be able to at least ask some high-level questions on the topic of risk and compliance.  While the report found that 76% of adopters were motivated to adopt cloud apps because of quick access to software, most of these managers found that after they made a purchase decision their access to exciting new capabilities in the cloud could be hindered due to performance and scalability constraints put forth  by their cloud provider.  If you are going to let your business consume their mission critical business applications as a service, then it’s important to understand who is providing those cloud services and what kind of performance you are going to get.  Different types of departments, companies and industries will all have unique requirements so it’s key to take this also into consideration.   Nothing puts a CEO in a bad mood like a public data breach or finding out the company lost money when customers couldn’t buy a product or service because your cloud service provider had a problem.  With 42% of business managers having seen a data security breach in their department associated directly with the use of cloud applications, this is happening more than you think.   We’ve talked about the importance of being able to avoid information silos through a unified cloud approach and platform.  This is also important when keeping your data safe and secure, and a key conversation to have with your cloud provider.  Your customers want to know that their information is protected when they do business with you, just like you want your own company information protected.   This is really hard to do when each line of business is running different cloud application services managed by different cloud providers, all with different processes and controls.   It only adds to the complexity, and the more complex, the more risky and the chance that something will go wrong. What about compliance? Depending on the cloud provider, it can be difficult at best to understand who has access to your data, and were your data is actually stored.  Add to this multiple cloud providers spanning multiple departments and it becomes very problematic when trying to comply with certain industry and country data security regulations.  With 73% of business managers complaining that having cloud data handled externally by one or more cloud vendors makes it hard for their department to be compliant, this is a big time suck for executives and it puts the organization at risk. Is There A Complete, Integrated, Modern Cloud Out there for Business Executives?If you are a business manager looking to drive faster innovation for your business and want a cloud application that your CIO would approve of, I would encourage you take a look at Oracle Cloud.  It’s everything you want from a SaaS based application, but without compromising on functionality and other modern capabilities like embedded business intelligence, social relationship management (for your entire business), and advanced mobile.  And because Oracle Cloud is built and managed by Oracle, you can be confident that your cloud application services are enterprise-grade.  Over 25 Million users and 10 thousands companies around the globe rely on Oracle Cloud application services everyday – maybe your business should too.  For more information, visit cloud.oracle.com. Additional Resources •    Try it: cloud.oracle.com•    Learn more: http://www.oracle.com/us/corporate/features/complete-cloud/index.html•    Research Report: Cloud for Business Managers: The Good, the Bad, and the Ugly

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  • Using WKA in Large Coherence Clusters (Disabling Multicast)

    - by jpurdy
    Disabling hardware multicast (by configuring well-known addresses aka WKA) will place significant stress on the network. For messages that must be sent to multiple servers, rather than having a server send a single packet to the switch and having the switch broadcast that packet to the rest of the cluster, the server must send a packet to each of the other servers. While hardware varies significantly, consider that a server with a single gigabit connection can send at most ~70,000 packets per second. To continue with some concrete numbers, in a cluster with 500 members, that means that each server can send at most 140 cluster-wide messages per second. And if there are 10 cluster members on each physical machine, that number shrinks to 14 cluster-wide messages per second (or with only mild hyperbole, roughly zero). It is also important to keep in mind that network I/O is not only expensive in terms of the network itself, but also the consumption of CPU required to send (or receive) a message (due to things like copying the packet bytes, processing a interrupt, etc). Fortunately, Coherence is designed to rely primarily on point-to-point messages, but there are some features that are inherently one-to-many: Announcing the arrival or departure of a member Updating partition assignment maps across the cluster Creating or destroying a NamedCache Invalidating a cache entry from a large number of client-side near caches Distributing a filter-based request across the full set of cache servers (e.g. queries, aggregators and entry processors) Invoking clear() on a NamedCache The first few of these are operations that are primarily routed through a single senior member, and also occur infrequently, so they usually are not a primary consideration. There are cases, however, where the load from introducing new members can be substantial (to the point of destabilizing the cluster). Consider the case where cluster in the first paragraph grows from 500 members to 1000 members (holding the number of physical machines constant). During this period, there will be 500 new member introductions, each of which may consist of several cluster-wide operations (for the cluster membership itself as well as the partitioned cache services, replicated cache services, invocation services, management services, etc). Note that all of these introductions will route through that one senior member, which is sharing its network bandwidth with several other members (which will be communicating to a lesser degree with other members throughout this process). While each service may have a distinct senior member, there's a good chance during initial startup that a single member will be the senior for all services (if those services start on the senior before the second member joins the cluster). It's obvious that this could cause CPU and/or network starvation. In the current release of Coherence (3.7.1.3 as of this writing), the pure unicast code path also has less sophisticated flow-control for cluster-wide messages (compared to the multicast-enabled code path), which may also result in significant heap consumption on the senior member's JVM (from the message backlog). This is almost never a problem in practice, but with sufficient CPU or network starvation, it could become critical. For the non-operational concerns (near caches, queries, etc), the application itself will determine how much load is placed on the cluster. Applications intended for deployment in a pure unicast environment should be careful to avoid excessive dependence on these features. Even in an environment with multicast support, these operations may scale poorly since even with a constant request rate, the underlying workload will increase at roughly the same rate as the underlying resources are added. Unless there is an infrastructural requirement to the contrary, multicast should be enabled. If it can't be enabled, care should be taken to ensure the added overhead doesn't lead to performance or stability issues. This is particularly crucial in large clusters.

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  • Is there any kind of established architecture for browser based games?

    - by black_puppydog
    I am beginning the development of a broser based game in which players take certain actions at any point in time. Big parts of gameplay will be happening in real life and just have to be entered into the system. I believe a good kind of comparison might be a platform for managing fantasy football, although I have virtually no experience playing that, so please correct me if I am mistaken here. The point is that some events happen in the program (i.e. on the server, out of reach for the players) like pulling new results from some datasource, starting of a new round by a game master and such. Other events happen in real life (two players closing a deal on the transfer of some team member or whatnot - again: have never played fantasy football) and have to be entered into the system. The first part is pretty easy since the game masters will be "staff" and thus can be trusted to a certain degree to not mess with the system. But the second part bothers me quite a lot, especially since the actions may involve multiple steps and interactions with different players, like registering a deal with the system that then has to be approved by the other party or denied and passed on to a game master to decide. I would of course like to separate the game logic as far as possible from the presentation and basic form validation but am unsure how to do this in a clean fashion. Of course I could (and will) put some effort into making my own architectural decisions and prototype different ideas. But I am bound to make some stupid mistakes at some point, so I would like to avoid some of that by getting a little "book smart" beforehand. So the question is: Is there any kind of architectural works that I can read up on? Papers, blogs, maybe design documents or even source code? Writing this down this seems more like a business application with business rules, workflows and such... Any good entry points for that? EDIT: After reading the first answers I am under the impression of having made a mistake when including the "MMO" part into the title. The game will not be all fancy (i.e. 3D or such) on the client side and the logic will completely exist on the server. That is, apart from basic form validation for the user which will also be mirrored on the server side. So the target toolset will be HTML5, JavaScript, probably JQuery(UI). My question is more related to the software architecture/design of a system that enforces certain rules. Separation of ruleset and presentation One problem I am having is that I want to separate the game rules from the presentation. The first step would be to make an own module for the game "engine" that only exposes an interface that allows all actions to be taken in a clean way. If an action fails with regard to some pre/post condition, the engine throws an exception which is then presented to the user like "you cannot sell something you do not own" or "after that you would end up in a situation which is not a valid game state." The problem here is that I would like to be able to not even present invalid action in the first place or grey out the corresponding UI elements. Changing and tweaking the ruleset Another big thing is the ruleset. It will probably evolve over time and most definitely must be tweaked. What's more, it should be possible (to a certain extent) to build a ruleset that fits a specific game round, i.e. choosing different kinds of behaviours in different aspects of the game. This would do something like "we play it with extension A today but we throw out extension B." For me, this screams "Architectural/Design pattern" but I have no idea on who might have published on something like this, not even what to google for.

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  • 'Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory' threw an exception

    - by user281180
    Hi I`m having the error message: The type initializer for 'Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory' threw an exception. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Practices.ObjectBuilder2, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. Source Error: Line 30: private static ICacheManager GetCacheManager() Line 31: { Line 32: return CacheFactory.GetCacheManager(cacheManagerName); Line 33: } Line 34: } Source File: C:\Dev\DEV\HotHouse\HotHousetest3_rtmClone107\Code\MvcUI\State\PersistentCache.cs Line: 32 Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.Practices.ObjectBuilder2, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded. , whereas my colleages using the same dll, are not having the error message. Help please. I have Microsoft.Practices.EnterpriseLibrary.Caching and Microsoft.Practices.EnterpriseLibrary.Common as references both version 4.1.0.0 and runtime version v2.0.50727.

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  • DevExpress AspxGridView clientside SelectionChanged problem when using paged ObjectDataSource

    - by Constantin Baciu
    The context is as follows: One DexExpress AspxGridView with a server-side paging/filtering/sorting mechanism (using ObjectDataSource). I've been having problems with the filter mechanism ( see this stack ). Now, the problem I'm having is this: the client-side events get mangled between DataSource events. :O . Let me explain what happens: if I change the page (or sort/filter for that matter), then, select one row from the grid, the client-side SelectionChanged event fires well. If I change the page (or sort/filter), the event doesn't fire anymore. Instead, on the server side, I get a "The method or operation is not implemented" exception with the following stack-trace: at DevExpress.Web.Data.WebDataProviderBase.GetListSouceRowValue(Int32 listSourceRowIndex, String fieldName) at DevExpress.Web.Data.WebDataProxy.GetListSourceRowValue(Int32 listSourceRowIndex, String fieldName) at DevExpress.Web.Data.WebDataProxy.GetKeyValueCore(Int32 index, GetKeyValueCallback getKeyValue) at DevExpress.Web.Data.WebDataSelectionBase.GetSelectedValues(String[] fieldNames, Int32 visibleStartIndex, Int32 visibleRowCountOnPage) at DevExpress.Web.Data.WebDataProxy.GetSelectedValues(String[] fieldNames) at DevExpress.Web.ASPxGridView.ASPxGridView.FBSelectFieldValues(String[] args) at DevExpress.Web.ASPxGridView.ASPxGridView.GetCallbackResultCore() at DevExpress.Web.ASPxGridView.ASPxGridView.GetCallbackResult() at DevExpress.Web.ASPxClasses.ASPxWebControl.System.Web.UI.ICallbackEventHandler.GetCallbackResult() Am I doing something wrong? Any help will be much appreciated.

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  • Core Data migration problem: "Persistent store migration failed, missing source managed object model

    - by John Gallagher
    The Background A Cocoa Non Document Core Data project with two Managed Object Models. Model 1 stays the same. Model 2 has changed, so I want to migrate the store. I've created a new version by Design Data Model Add Model Version in Xcode. The difference between versions is a single relationship that's been changed from to a one to many. I've made my changes to the model, then saved. I've made a new Mapping Model that has the old model as a source and new model as a destination. I've ensured all Mapping Models and Data Models and are being compiled and all are copied to the Resource folder of my app bundle. I've switched on migrations by passing in a dictionary with the NSMigratePersistentStoresAutomaticallyOption key as [NSNumber numberWithBool:YES] when adding the Persistent Store. Rather than merging all models in the bundle, I've specified the two models I want to use (model 1 and the new version of model 2) and merged them using modelByMergingModels: The Problem No matter what I do to migrate, I get the error message: "Persistent store migration failed, missing source managed object model." What I've Tried I clean after every single build. I've tried various combinations of having only the model I'm migrating to in Resources, being compiled, or both. Since the error message implies it can't find the source model for my migration, I've tried having every version of the model in both the Resources folder and being compiled. I've made sure I'm not making a really basic error by switching back to the original version of my data model. The app runs fine. I've deleted the Mapping Model and the new version of the model, cleaned, then recreated both. I've tried making a different change in the new model - deleting an entity instead. I'm at my wits end. I can't help but think I've made a huge mistake somewhere that I'm not seeing. Any ideas?

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  • DevExpress AspxGridView clientside SelectionChanged problem when using paged ObjectDataSource

    - by Constantin Baciu
    The context is as follows: One DexExpress AspxGridView with a server-side paging/filtering/sorting mechanism (using ObjectDataSource). I've been having problems with the filter mechanism ( see this stack ). Now, the problem I'm having is this: the client-side events get mangled between DataSource events. :O . Let me explain what happens: if I change the page (or sort/filter for that matter), then, select one row from the grid, the client-side SelectionChanged event fires well. If I change the page (or sort/filter), the event doesn't fire anymore. Instead, on the server side, I get a "The method or operation is not implemented" exception with the following stack-trace: at DevExpress.Web.Data.WebDataProviderBase.GetListSouceRowValue(Int32 listSourceRowIndex, String fieldName) at DevExpress.Web.Data.WebDataProxy.GetListSourceRowValue(Int32 listSourceRowIndex, String fieldName) at DevExpress.Web.Data.WebDataProxy.GetKeyValueCore(Int32 index, GetKeyValueCallback getKeyValue) at DevExpress.Web.Data.WebDataSelectionBase.GetSelectedValues(String[] fieldNames, Int32 visibleStartIndex, Int32 visibleRowCountOnPage) at DevExpress.Web.Data.WebDataProxy.GetSelectedValues(String[] fieldNames) at DevExpress.Web.ASPxGridView.ASPxGridView.FBSelectFieldValues(String[] args) at DevExpress.Web.ASPxGridView.ASPxGridView.GetCallbackResultCore() at DevExpress.Web.ASPxGridView.ASPxGridView.GetCallbackResult() at DevExpress.Web.ASPxClasses.ASPxWebControl.System.Web.UI.ICallbackEventHandler.GetCallbackResult() Am I doing something wrong? Any help will be much appreciated.

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  • c# WinForms ReportViewer Performance issue using RefreshReport() and ServerReport.SetParameters()

    - by mdk
    Hi All, Currently I am writing a c# client application that uses the WinForms ReportViewer Control to display reports from a remote server. I am having performance troubles with the ReportViewer Control, to be specific with the 2 methods reportViewer.ServerReport.SetParameters() and reportViewer.RefreshReport() – they both take a really long time to complete and not just on the very first call, but on each subsequent call as well. SetParameters() takes 20 to 40 seconds (they vary greatly in time, some execute event okay fast) and RefreshReport() is a bit faster but still takes ages. I don’t think the server is the culprit, as the same report viewed using the browser renders pretty fast, about a second tops. The report in question doesn't matter as well. When I break into the process and take a look at the call stack, I see a call to Socket.DoConnect. So I thought that’s a good reason to start using fiddler and I installed it, disabled caching and fired up the app again to see which call takes that long to connect, but the performance issue was gone. By using a proxy I am having the same performance as the webbrowser. FYI: I am using NTLM authentication in the following way: reportViewer.ServerReport.ReportServerCredentials.NetworkCredentials = new NetworkCredentials() { Username = ... } I don’t have a strong webbackground, so I guess my question is: What should this tell me / What should I be looking into? (Btw: Adding fiddler to my installation package is not the solution I am looking for :)) I am grateful for any pointers. Take care, -Martin

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  • Refresh UltraGrid's GroupBy Sort on child bands when ListChanged?

    - by Idriss
    I am using Infragistics 2009 vol 1. My UltraGrid is bound to a BindingList of business objects "A" having themself a BindingList property of business objects "B". It results in having two bands: one named "BindingList`1", the other one "ListOfB" thanks to the currency manager. I would like to refresh the GroupBy sort of the grid whenever a change is performed on the child band through the child business object and INotifyPropertyChange. If I group by a property in the child band which is a boolean (let's say "Active") and I subscribe to the event ListChanged on the bindinglist datasource with this event handler: void Grid_ListChanged(object sender, ListChangedEventArgs e) { if (e.ListChangedType == ListChangedType.ItemChanged) { string columnKey = e.PropertyDescriptor.Name; if (e.PropertyDescriptor.PropertyType.Name == "BindingList`1") { ultraGrid.DisplayLayout.Bands[columnKey].SortedColumns.RefreshSort(true); } else { UltraGridBand band = ultraGrid.DisplayLayout.Bands[0]; UltraGridColumn gc = band.Columns[columnKey]; if (gc.IsGroupByColumn || gc.SortIndicator != SortIndicator.None) { band.SortedColumns.RefreshSort(true); } ColumnFilter cf = band.ColumnFilters[columnKey]; if (cf.FilterConditions.Count > 0) { ultraGrid.DisplayLayout.RefreshFilters(); } } } } the band.SortedColumns.RefreshSort(true) is called but It gives unpredictable results in the groupby area when the property Active is changed in the child band: if one object out of three actives becomes inactive it goes from: Active : True (3 items) To: Active : False (3 items) Instead of (which is the case when I drag the column back and forth to the group by area) Active : False (1 item) Active : True (2 items) Am I doing something wrong? Is there a way to restore the expanded state of the rows when performing a RefreshSort(true); ?

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  • Decoding ima4 audio format

    - by MrDatabase
    To reduce the download size of an iPhone application I'm compressing some audio files. Specifically I'm using afconvert on the command line to change .wav format to .caf format w/ ima4 compression. I've read this (wooji-juice.com) awesome post about this exact topic. I'm having trouble w/ the "decoding ima4 packets" step. I've looked at their sample code and I'm stuck. Please help w/ some pseudo code or sample code that can guide me in the right direction. Thanks! Additional info: Here is what I've completed and where I'm having trouble... I can play .wav files in both the simulator and on the phone. I can compress .wav files to .caf w/ ima4 compression using afconvert on the command line. I'm using the SoundEngine that came w/ CrashLanding (I fixed one memory leak). I modified the SoundEngine code to look for the mFormatID 'ima4'. I don't understand the blog post linked above starting w/ "Calculating the size of the unpacked data". Why do I need to do this? Also, what does the term "packet" refer to? I'm very new to any sort of audio programming.

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  • Autofac WCF integration + sessions

    - by Michael Sagalovich
    I am having an ASP.NET MVC 3 application that collaborates with a WCF service, which is hosted using Autofac host factory. Here are some code samples: .svc file: <%@ ServiceHost Language="C#" Debug="true" Service="MyNamespace.IMyContract, MyAssembly" Factory="Autofac.Integration.Wcf.AutofacServiceHostFactory, Autofac.Integration.Wcf" %> Global.asax of the WCF service project: protected void Application_Start(object sender, EventArgs e) { ContainerBuilder builder = new ContainerBuilder(); //Here I perform all registrations, including implementation of IMyContract AutofacServiceHostFactory.Container = builder.Build(); } Client proxy class constructor (MVC side): ContainerBuilder builder = new ContainerBuilder(); builder.Register(c => new ChannelFactory<IMyContract>( new BasicHttpBinding(), new EndpointAddress(Settings.Default.Url_MyService))) .SingleInstance(); builder.Register(c => c.Resolve<ChannelFactory<IMyContract>>().CreateChannel()) .UseWcfSafeRelease(); _container = builder.Build(); This works fine until I want WCF service to allow or require sessions ([ServiceContract(SessionMode = SessionMode.Allowed)], or [ServiceContract(SessionMode = SessionMode.Required)]) and to share one session with the MVC side. I changed the binding to WSHttpBinding on the MVC side, but I am having different exceptions depending on how I tune it. I also tried changing AutofacServiceHostFactory to AutofacWebServiceHostFactory, with no result. I am not using config file as I am mainly experimenting, not developing real-life application, but I need to study the case. But if you think I can achieve what I need only with config files, then OK, I'll use them. I will provide exception details for each combination of settings if required, I'm omitting them not to make the post too large. Any ideas on what I can do?

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  • Making flexible C# code in MVC2 for Stored Procedures

    - by cc0
    Thanks to Darin Dimitrov's suggestion I got a big step further in understanding good MVC code, but I'm having some problems making it flexible. I implemented Darin's suggested solution, and it works perfectly for single controllers. However I'm having some trouble implementing it with some flexibility. What I'm looking for is this; To be able to make dynamic column names in json Instead of using "Column1: 'value', ..." and "Column2: 'value', ..." inside the json, I'd like to use for example "id: 'value', ..." and "place: 'value' ..." for one stored procedure, and "animal" and "type" in another (inside the json format). To be able to make dynamic amounts of columns dependent on which stored procedure is called Some stored procedures I'll want to read more than 2 rows from, is there a smart way of accomplishing that? To be able to make numeric (floats and integers) rows from the database be presented inside the json without quotes Like this (name and age); { Column1: "John", Column2: 53 }, I would be very grateful for any feedback and suggestions / code examples I can get here. Even imperfect ones.

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  • Understanding ServiceKnownType in WCF

    - by SLC
    I am having a little trouble understanding ServiceKnownType in WCF. Taken from this blog, the following code does not work: [DataContract(Namespace = “http://mycompany.com/”)] public class Shape{…} [DataContract(Namespace = “http://mycompany.com/”)] public class Circle : Shape {…} [ServiceContract] public interface IMyServer { [OperationContract] bool AddShape(Shape shape); } . IMyServer client = new ChannelFactory<IMyServer>(binding, endPoint).CreateChannel(); client.AddShape(new Circle()); The reason it doesn't work is because you are trying to add a circle, but the servicecontract only allows a Shape. You are supposed to do something with knowntypes, but I am a bit confused about how that works. Since that code is in the service, why doesn't it know automatically that a Circle is derived from Shape? Additionally, what does ServiceKnownType actually do? When ServiceKnownType is put below the DataContract, apparently that makes it work. I am guessing it says hey, this particular object type called Shape can also be a Circle. I am having trouble understanding why it would do it this way around, because if you add a new type like Square you are going to have to add that too, wouldn't it make sense if it cannot infer it, to put the KnownType onto the Square rather than the Shape? So the Square says hey, I am a Shape, and you don't have to fiddle with the Shape class?

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  • How to programmatically show & hide BalloonPopupExtender?

    - by Danferd
    I have a page that will be having few buttons that will redirect user to certain pages that required them to login before to proceed to the page. I would like to have something like, when user click on the button that required login and if user is not logged in prior to the click, a tooltip will show up beside the 'User ID' textbox to inform user to login in order to proceed. So, I implemented the jQuery Tooltipster in the page to show the tooltip message. I'm having problem on IE8 in Windows XP where the first click on the button, the tooltip would show up, but the second click it wouldn't then the third click, it shows up again and then the fourth click, it wouldn't! But for IE8 in Windows 7, IE9 & IE10, they have no such problem. Any idea how to fix this? The 'imgBtnKISS' & 'lnkBtnKISS' buttons are located in a content page but the tooltip and the 'User ID' textbox are in a master page. Below is the code that how I call the tooltip: function loginAlertMsg() { $('.tooltip').tooltipster({ trigger: 'custom', position: 'left', onlyOne: false, content: 'Login required! Please login to proceed.' }); $('#ctl00_txtID').tooltipster('show'); $('#ctl00_txtID').focus(); } Private Sub KISS_Click() Handles imgBtnKISS.Click, lnkBtnKISS.Click If Not bIsRefresh Then '==Detect User Login Status== Session(sesClickFromIcon) = toKISS If Session(USR.sesLogin) Is Nothing Then '//User NOT LOGIN. If (Not Page.ClientScript.IsStartupScriptRegistered("loginAlertMsg")) Then Page.ClientScript.RegisterStartupScript(Me.GetType(), "loginAlertMsg", "loginAlertMsg();", True) End If Exit Sub Else If Trim(CType(Session.Item(USR.sesLogin), Boolean)) <> True Then '//User NOT LOGIN. If (Not Page.ClientScript.IsStartupScriptRegistered("loginAlertMsg")) Then Page.ClientScript.RegisterStartupScript(Me.GetType(), "loginAlertMsg", "loginAlertMsg();", True) End If Exit Sub End If End If '**Detect User Login Status** Response.Redirect("~/page2.aspx", False) Session.Remove(sesClickFromIcon) End If End Sub

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  • LINQ To SQL ignore unique constraint exception and continue

    - by Martin
    I have a single table in a database called Users Users ------ ID (PK, Identity) Username (Unique Index) I have setup a unique index on the Username table to prevent duplicates. I am then enumerating through a collection and creating a new user in the database for each item. What I want to do is just insert a new user and ignore the exception if the unique key constraint is violated (as it's clearly a duplicate record in that case). This is to avoid having to craft where not exists kind of queries. First off, is this going to be any more efficient or should my insert code be checking for duplicates instead? I'm drawn more to the database having that logic as this prevents any other type of client from inserting duplicate data. My other issue is related to LINQ To SQL. I have the following code: public class TestRepo { DatabaseDataContext database = new DatabaseDataContext(); public void Add(string username) { database.Users.InsertOnSubmit(new User() { Username = username }); } public void Save() { database.SubmitChanges(); } } And then I iterate over a collection and insert new users, ignoring any exceptions: TestRepo repo = new TestRepo(); foreach (var name in new string[] { "Tim", "Bob", "John" }) { try { repo.Add(name); repo.Save(); } catch { } } The first time this is run, great I have three users in the table. If I remove the second one and run this code again, nothing is inserted. I expected the first insert to fail with the exception, the second to succeed (as I just removed that item from the DB) and the third to then fail. What seems to be happening is that once the SqlException is thrown (even though the loop continues to iterate) all of the next inserts fail - even when there isn't a row in the table that would cause a unique violation. Can anyone explain this? P.S. The only workaround I could find was to instantiate the repo each time before the insert, then it worked exactly as excepted - indicating that it's something to do with the LINQ To SQL DataContext. Thanks.

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  • POST from edit/create partial views loaded into Twitter Bootstrap modal

    - by mare
    I'm struggling with AJAX POST from the form that was loaded into Twitter Bootstrap modal dialog. Partial view form goes like this: @using (Html.BeginForm()) { // fields // ... // submit <input type="submit" value="@ButtonsRes.button_save" /> } Now this is being used in non AJAX editing with classic postbacks. Is it possible to use the same partial for AJAX functionality? Or should I abstract away the inputs into it's own partial view? Like this: @using (Ajax.BeginForm()) { @Html.Partial("~/Views/Shared/ImageEditInputs.cshtml") // but what to do with this one then? <input type="submit" value="@ButtonsRes.button_save" /> } I know how to load this into Bootstrap modal but few changes should be done on the fly: the buttons in Bootstrap modal should be placed in a special container (the modal footer), the AJAX POST should be done when clicking Save which would first, validate the form and keep the modal opened if not valid (display the errors of course) second, post and close the modal if everything went fine in the view that opened the modal, display some feedback information at the top that save was succesful. I'm mostly struggling where to put what JS code. So far I have this within the List view, which wires up the modals: $(document).ready(function () { $('.openModalDialog').click(function (event) { event.preventDefault(); var url = $(this).attr('href'); $.get(url, function (data) { $('#modalContent').html(data); $('#modal').modal('show'); }); }); }); The above code, however, doesn't take into the account the special Bootstrap modal content placeholder (header, content, footer). Is it possible to achieve what I want without having multiple partial views with the same inputs but different @using and without having to do hacks with moving the Submit button around?

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  • CSS layout that fills available space

    - by Jared I
    I'm trying to do a seemingly simple webpage layout, but I'm hitting a wall. I'd like to do everything purely with CSS (no tables to much things up, and no javascript dynamically resizing things) I'd like to have: A heading with a fixed height A footer with a fixed height Left sidebar with a fixed width Right sidebar with a fixed width The whole layout always fills the entire viewport (i.e. if the user resizes the window, the layout grows to the new size) Put another way: |< Total width is 100% of viewport >| +--------------------------------------------------------------+ --- | Header with a fixed height | ^ |--------+-------------------------------------------+---------+ | | | | | | | | | Left | | Right | Total | with | Center grows in height/width | with | height | fixed | and has scrollbars if necessary | fixed | is | width | | width | 100% | | | | of | | | | viewport | | | | |--------+-------------------------------------------+---------| | Footer with a fixed height | v +--------------------------------------------------------------+ --- The parts that are giving me the most trouble are Having the sidebars and center have a height equal to the height of the viewport minus the heights of the header and footer Having the center have a width equal to the width of the viewport minus the widths of the two sidebars I have no problem requiring users to have a modern browser. I'm aware that similar questions to this have been asked before, such as Make a div fill remaining space (http://stackoverflow.com/questions/1717564) Three row tableless CSS layout with middle row that fills remaining space (http://stackoverflow.com/questions/1703455) Create 2 divs, one takes up remaining space (http://stackoverflow.com/questions/1717564) ... and the conclusion seems to be that there isn't a good solution. Those answers are somewhat old, so I'm hoping that someone knows the trick now.

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  • ASP.Net MVC 2 - Need To Add A Default Property To A Strongly Typed Html.Textbox Helper In Asp.Net MV

    - by Sara
    I'm having a problem with something that I'm sure is very simple. I have been using Asp.Net MVC and I decided to start using Asp.Net MVC 2. Something has changed and now I need a little help. The strongly typed helpers are now written like this - <%= Html.TextBoxFor(model => model.State) %> I need to add a default value to a textbox. In the prior version of Asp.Net MVC it was easy to assign a default value. I thought doing the following would work in MVC 2- <%= Html.TextBoxFor(model => model.CountyId, new{ value = 840 })%> This, however, does not work for me in Asp.Net MVC 2. The value is still blank for the textbox. I want to make sure that this isn't some random error that I am having. Has anyone else encountered the same problem? I have searched and searched to find more information on the default property for the html helpers in MVC 2, but I can't find anything. Does anyone out there know how to correctly assign a default value to a textbox in Asp.Net MVC 2?

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  • MVP, WinForms - how to avoid bloated view, presenter and presentation model

    - by MatteS
    When implementing MVP pattern in winforms I often find bloated view interfaces with too many properties, setters and getters. An easy example with be a view with 3 buttons and 7 textboxes, all having value, enabled and visible properties exposed from the view. Adding validation results for this, and you could easily end up with an interface with 40ish properties. Using the Presentation Model, there'll be a model with the same number of properties aswell. How do you easily sync the view and the presentation model without having bloated presenter logic that pass all the values back and forth? (With that 80ish line presenter code, imagine with the presenter test that mocks the model and view will look like..160ish lines of code just to mock that transfer.) Is there any framework to handle this without resorting to winforms databinding? (you might want to use different views than a winforms view. According to some, this sync should be the presenters job..) Would you use AutoMapper? Maybe im asking the wrong questions, but it seems to me MVP easily gets bloated without some good solution here..

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  • Changing size of content in HorizontalScrollView when phone is rotated by overriding onConfiguration

    - by Emil Arfvidsson
    Hello I have a problem with resizing content in a HorizontalScrollView when the phone is rotated. I'm overriding onConfigurationChanged in my activity containing the HorizontalScrollView, since I want to handle the resizing myself. However, I'm having great problem finding where i should put the resizing of the content. The HorizontalScrollView it self has FILL_PARENT as width and a fixed height. The idea is that it should always fill the screen width-wise, while having several cells of content, each as wide as the HorizontalScrollView itself. The content in my HorizontalScrollView consists of one LinearLayout (let's call it wrapperLayout) with several LinearLayouts inside it. When the phone rotates I simply want to change the width of all the LinearLayouts inside the wrapperLayout. This is easy to do and works great when I test the resizing code by putting it in onInterceptTouchEvent(MotionEvent ev), that is the views are resized just as they are supposed to when I touch the HorizontalScrollView. The difficulty appears when I try to find a good spot to execute resizing code, so that the resizing happens automatically when the phone is rotated. I have tried all possible combinations of requestLayout, onSizeChanged, onLayout, onConfigurationChanged and a few others and varying their calls to super (if any) before and after the resizing code. I can not make this work (the views are not resized even though the resize code is executed) and it is really frustrating. I've done a lot of logging to make sure the HorizonalScrollView really has changed width before calling my resize code but to no avail. Does anyone have any clue as to what is going on? What methods are called and in what order when I handle the onConfigurationChanged by myself like this? Thanks in advance

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  • CPUID on Intel i7 processors

    - by StarPacker
    I'm having an issue with my CPUID-based code on newer i7-based machines. It is detecting the CPU as having a single core with 8 HT units instead of 4 cores each with 2 HT units. I must be misinterpreting the results of the CPUID information coming back from the CPU, but I can't see how. Basically, I iterate through each processor visible to Windows, set thread affinity to that thread and then make a sequence of CPUID calls. args = new CPUID_Args(); args.eax = 1; executeHandler(ref args); if (0 != (args.edx & (0x1 << 28))) { //If the 28th bit in EDX is flagged, this processor supports multiple logical processors per physical package // in this case bits 23:16 of EBX should give the count. //** EBX here is 0x2100800 logicalProcessorCount = (args.ebx & 0x00FF0000) >> 16; //** this tells me there are 16 logical processors (wrong) } else { logicalProcessorCount = 1; } apic = unchecked((byte)((0xFF000000 & args.ebx) >> 24)); if (maximumSupportedCPUID >= 4) { args = new CPUID_Args(); args.eax = 4; executeHandler(ref args); //EAX now contains 0x1C004121 coreCount = 1 + ((args.eax & 0xFC000000) >> 26); //This calculates coreCount as 8 } else { coreCount = 1; } This sequence repeats for the remainder of the CPUs in the system. Has anyone faced this before?

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  • Elmah for non-HTTP protocol applications OR Elmah without HttpContext

    - by Josh
    We are working on a 3-tier application, and we've been allowed to use the latest and greatest (MVC2, IIS7.5, WCF, SQL2k8, etc). The application tier is exposed to the various web applications by WCF services. Since we control both the service and client side, we've decided to use net.tcp bindings for their performance advantage over HTTP. We would like to use ELMAH for the error logging, both on the web apps and services. Here's my question. There's lots of information about using ELMAH with WCF, but it is all for HTTP bindings. Does anyone know if/how you can use ELMAH with WCF services exposing non-HTTP endpoints? My guess is no, because ELMAH wants the HttpContext, which requires the AspNetCompatibilityEnabled flag to be true in the web.config. From MSDN: IIS 7.0 and WAS allows WCF services to communicate over protocols other than HTTP. However, WCF services running in applications that have enabled ASP.NET compatibility mode are not permitted to expose non-HTTP endpoints. Such a configuration generates an activation exception when the service receives its first message. If it is true that you cannot use ELMAH with WCF services having non-HTTP endpoints, then the follow-up question is: Can we use ELMAH in such a way that doesn't need HttpContext? Or more generally (so as not to commit the thin metal ruler error), is there ANY way to use ELMAH with WCF services having non-HTTP endpoints?

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  • XtraGrid Suite - is there a way to add a button or hyperlink to a cell?

    - by calico-cat
    I'm working with the XtraGrid Suite made by DevExpress. I can't find any sort of functionality to do this, but I'm curious if you can add a button or hyperlink to a grid cell. Context: I've got an Events list. Each Event has a Time, Start/End, and a Category (Utility and Maintenance). There can be Start events and Stop events. Having done my analysis of the problem, I've decided that having a StartTime and EndTime for each event would not work. So if an event starts, I'd record the current time to the Event object, and set it as a 'Start' event. I'd like to add a "Stop" button/hyperlink to a cell in that row. If the user wishes to log an Ends event, the event type, etc would be copied to a new Event with the type 'Stop' and the button would disappear. I hope this makes sense. EDIT: Aaronaught's answer is actually better than what I was originally asking (a button) so I've updated the question. That way, anyone looking for putting a hyperlink in a cell can benefit from his example : )

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  • Problem Rendering SIFR with revision 436 on IE6 and IE7

    - by Mark
    Hi, I seem to have a problem with SIFR3. I'm using version 436 and from all my testing it appears to be a problem associated with IE6 and IE7 as I cannot replicate the issue in Firefox, Chrome, Safari for Windows, or even IE8. The problem is occurring on my company's website and can be seen here: http://www.wyldeia.co.uk/blog.php When you first go to the page in IE6 or IE7 it appears to render fine. However if you click away onto another page and then click the back button in the browser, all of the text is replaced by an error saying "Rendered with sIFR3 revision 436". If you refresh the page, then the problem goes away, that is until you browse away and come back again. I've tried this on two separate machines both running IE7.0.6000.16809, and a further separate machine running IE6 which I then upgraded to IE8. I thought initially it might be Flash player related but on upgrading from version 9 to 10 of the flash player the problem remains. Further digging around indicated that the error can be caused by having a corrupted flash font file, or having one present that was generated with a previous revision of SIFR3. However I have exported the flash font file using the supplied fla with revision 436 but the problem remains. Usually I like to track the answer down myself but as it is I'm at a bit of a loss on this one so if anyone has any ideas what might be happening here then I would be very grateful! Regards, Mark

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  • Adding click/double-click events to static group box controls

    - by omatai
    Having realised my own reasons were way too dubious, I've now gone about this a different way. But I'm still curious... For reasons of nostalgia, familiarity and laziness, I'm coding a UI with MFC. For dubious reasons (as if those were not enough), I wanted to add a (double-)click event to a group box. Naturally, the group box contains things - in fact, it contains another static item, to which I can successfully add a (double-)click event handler. Is there any reason I cannot get an event handler to work for clicks on my group box the same way I can do that for the simple text static item? No amount of clicking on, in or near the control fires the event. Note - I've read through http://www.codeproject.com/KB/static/staticctrl_tut.aspx and tried responding to both ON_STN_... events and ON_BN_... messages, setting the notify style (BS_NOTIFY appears in the rc file)... and still I'm missing something - what is it? Is it even possible? Most of what I've googled suggests it is... but without clear answers for C++/MFC. Since first posting this question, I've found reference to a WM_NCHITTEST message, and hints that you have to create a handler for this message to override the group box default behaviour of responding with HT_TRANSPARENT... despite having its transparent property in ClassWizard set to false. Hmmm. Can anyone confirm that this is indeed the key?

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