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• Query on MVVM design pattern on WPF.

  - by Ashish Ashu

  I am using MVVM architecture. I have a usercontrol UC as a View Model is a ModelData class ViewModel (UCViewModel) is binded to a usercontrol. I have three more usercontrols that is inside the usercontrol UC ( discussed above). Let's say uc1, uc2 and uc3. and the visibility of uc1 , uc2 and uc3 inside UC depends on the type selected ( which ever radio button is selected ). Since UC is binded to UCViewModel and I have to do all the stuff related to uc1 , uc2 and uc3 inside UCViewModel. Can I have seperate VM to uc1 , uc2 and uc3.. if Yes how can i do that ? Please Help!!

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• Differences in IE8 behavior between XP, Vista, Win7?

  - by Piskvor

  Is there any significant difference in behavior (HTML, CSS, Javascript, ...) with Internet Explorer 8 on different operating systems? In other words, will a web page work the same way across IE8+XP, IE8+Vista and IE8+Win7, or are there some significant differences? (I'm aware that installed plugins and fonts will have an impact, but that's a bit outside my scope at the moment; assuming compatibility mode X-UA-Compatible: IE=8 or edge) Although The IEBlog contains very useful information, I haven't found this data there - so I'm assuming that there should not be any difference. However, search has turned up this (vague) question: "IE8 on XP: looks great! IE8 on Vista: looks terrible". Will have to check IE8+{XP,V,7} in VM in the meantime.

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• OutOfMemoryException - out of ideas II

  - by Captain Comic

  Hello, This question is related to my previous question. The storyline: I have an application which consumes a lot of memory if you look at task manager VMSize. I am trying to find out what consumes this amount of memory. You see in the picture below that VM size is 2,46 GB Ok now I am looking at .net performance counters Committed and reserved bytes add up to only 1,2 GB Now lets look at windb sos debugging. Let's run eeheap -gc command The heap size used by GC is only 340 MB. Where is the rest of used memory? I need to discover why WM size in TaskManager is 2.4 GB

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• Problems with Castle DynamicProxy2 on .Net 3.5 SP1 on Win2003 Server

  - by Andrea Balducci

  I've an mvc + nh asp.net application. On my dev machine (win 7 Ent) all works fine, if deployed on a Win 2k3 (tried 2 different vm and one phisical machine) I got the following error.. anyone can help? Cannot explain this issue (tried the same build, so i think it'a machine configuration issue).. Derived method 'set_ID' in type 'CustomerProxy75950979a2a048e889584c21696f7f1b' from assembly 'DynamicProxyGenAssembly2, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' cannot reduce access [TypeLoadException: Derived method 'set_ID' in type 'CustomerProxy75950979a2a048e889584c21696f7f1b' from assembly 'DynamicProxyGenAssembly2, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' cannot reduce access.] System.Reflection.Emit.TypeBuilder._TermCreateClass(Int32 handle, Module module) +0 System.Reflection.Emit.TypeBuilder.CreateTypeNoLock() +915 System.Reflection.Emit.TypeBuilder.CreateType() +108 Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.BuildType() +48 Castle.DynamicProxy.Generators.ClassProxyGenerator.GenerateCode(Type[] interfaces, ProxyGenerationOptions options) +3821 Castle.DynamicProxy.DefaultProxyBuilder.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options) +84 Castle.DynamicProxy.ProxyGenerator.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, Object[] constructorArguments, IInterceptor[] interceptors) +92 Castle.DynamicProxy.ProxyGenerator.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, IInterceptor[] interceptors) +21 NHibernate.ByteCode.Castle.ProxyFactory.GetProxy(Object id, ISessionImplementor session) +283

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• download jdk1.5.0_18 source code

  - by Don

  Hi, I'm looking for the JDK source code for Java 1.5 update 18 (on win XP). I don't want to install a JDK, I don't want the source code for the entire VM, just the source for the JDK libs, so that when I navigate to a Java class in Eclipse, it opens up the source code. Is it possible to download just src.zip (or a zip that contains src.zip)? I don't want to install a new JDK/JRE just to get access to src.zip as I'm concerned that this will have undesirable side-effects such as modifying JAVA_HOME. Thanks, Don

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• java.lang.UnsupportedClassVersionError: Bad version number in .class file?

  - by grmn.bob

  I am getting this error when I include an opensource library that I had to compile from source. Now, all the suggestions on the web indicate that the code was compiled in one version and executed in another version (new on old). However, I only have one version of JRE on my system. If I run the commands: $ javac -version javac 1.5.0_18 $ java -version java version "1.5.0_18" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_18-b02) Java HotSpot(TM) Server VM (build 1.5.0_18-b02, mixed mode) and check in Eclipse for the properties of the java library, I get 1.5.0_18 Therefore, I have to conclude something else, internal to a class itself, is throwing the exception?? Is that even possible?

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• Java: notify() vs. notifyAll() all over again

  - by Sergey Mikhanov

  If one google for "difference between notify() and notifyAll()" then a lot of explanations will pop up (leaving apart the javadoc paragraphs). It all boils down to the number of waiting threads being waken up: one in notify() and all in notifyAll(). However (if I do understand the difference between these methods right), only one thread is always selected for further monitor acquisition; in the first case the one selected by the VM, in the second case the one selected by the system thread scheduler. The exact selection procedures for both of them (in general case) are not known to the programmer. What's is the useful difference between notify() and notifyAll() then? Am I missing something?

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• J2ME VS Android VS iPhone VS Symbian VS Windows CE

  - by Sadi

  I have very little idea about mobile platform, though I am interested to program for mobile platform. Would you please compare between J2ME VS Android VS iPhone VS Symbian VS Windows CE. I would like to know which one is better, and if there is any VM technology to test the programs. Which one should I choose and why? Is there any IDE, debugging facilities? Personally I would like to code for open source, but any suggestion are welcome. I have preliminary knowledge on java. I would also like to know, if there is anything else that you can recommended. Thank you

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• WinHTTP and Windows 7 x64: Error

  - by JackOfAllTrades

  I have an application which uses WinHTTP, and it seems under Windows 7 (64-bit; have yet to test the 32-bit version) the call to WinHttpOpen fails, returning "The group or resource is not in the correct state to perform the requested operation." This corresponds to error code 5023, and occurs for the Administrator as well as a standard user. The C++ DLL containing this call was compiled using Visual Studio 2008 (32-bit) on a Windows XP Professional system. Other than Outlook 2007, this is an otherwise clean install in a VM. Thanks!

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• NVelocity ASP.NET Examples

  - by Ben

  I'm looking to use NVelocity in my ASP.NET MVC application, not as a view engine, just for rendering some email templates. However, I cannot for the life of me get it to work. I have downloaded it from the castle project and followed the example at http://www.castleproject.org/others/nvelocity/usingit.html#step1 No matter what I try I don't seem to be able to load a template located in my site. The example suggests using the absolute path, which I have tried to no avail: Template t = engine.GetTemplate("/Templates/TestEmail.vm"); So please can someone give me two examples. One of loading a template located in the web site directory and secondly one parsing a string variable (as it is likely that my templates will be stored in a database). Many thanks Ben

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• Debug an Eclipse plugin in a different language?

  - by david

  I'm trying to debug an Eclipse plug-in when it is running in another language (japanese). The problem I'm encountering is: I can't get the Eclipse debugger to run another Eclipse instance in another language. I've got all my strings externalized to resource bundles ... and, when the plug-in is installed in Eclipse on a machine that has it's default language set to Japanese, it runs OK ... but there are a few problems that I need to resolve. I've tried setting the Eclipse -nl parameter to ja_JP along with '-Duser.language=ja -Duser.country=JP' on the VM arguments, but every time Eclipse is launched, everything is in English. Any suggestions on how I can get the debugger to launch the Eclipse instance in Japanese?

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• WMIprvse process leaks memory on 2008 server R2

  - by Dani Fischer

  I have a Windows 2008 R2 server running on a VM machine. My .NET service is running on this server periodically querying WMI, for example: SELECT ProcessId FROM Win32_Service WHERE ... After a day or two WMIprvse takes up to 500M memory and WMI queries start getting out of memory exceptions. This article seems to be talking about this issue: "http://support.microsoft.com/kb/958124" I've seen other articles saying that Microsoft is aware of the problem and not going to issue a fix until the next major release. http://social.msdn.microsoft.com/Forums/en/netfxbcl/thread/256eb40c-d050-4278-a3d8-863e30db02a0 I'd appreciate any suggestions and insights on this.

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• Can you return an assignable lvalue in Scala?

  - by Alex R

  (note, lvalue is actually a term from the C grammar, I don't know what it's called in Scala!) Trying to learn Scala... this evening I'm working on an internal DSL for a dynamically scoped language that might resemble PHP syntax. My REPL is: Welcome to Scala version 2.7.6.final (Java HotSpot(TM) Client VM, Java 1.6.0). I have some made-up example code: class $(any: Any) { def update(sym: Symbol, any: Any) { println("line 2 executed");} def -(sym: Symbol) : $ = { println("line 1 executed"); return this } def update(any: Any) { println("line 3 executed");} } The following works as expected: scala var a = new $(0) a: $ = $@19238ad scala a('x) = "blah" line 2 executed On the other hand, why does the following not invoke the 1-parameter update method? scala a = 1 :6: error: type mismatch; found : Int(1) required: $ a = 1 ^ Ultimately, I would like this to work: a-'x = "blah" Thanks

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• Invoke or BeginInvoke cannot be called on a control until the window handle has been created.

  - by blade3

  Hi I am trying to install SQL Server 2008 Developer Edition x64 on a Windows Server 2008 VM. I run the installer for a standalone installation and this works fine for the setup support rules bit. That passes ok but then I get this error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.. BUTTONS: OK How can I resolve this? I am getting 2008 R2 CTP but this is just a CTP. My download is from DreamSpark. Thanks

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• Silverlight MVVM conversion from WPF

  - by IrishJoker

  I was reading this article - http://msdn.microsoft.com/en-us/magazine/dd419663.aspx And I came across this piece of code in the WPF Demo application that came with the article. This template applies a CustomerView to an instance of the CustomerViewModel class shown in the main window. <DataTemplate DataType="{x:Type vm:CustomerViewModel}"> <vw:CustomerView /> </DataTemplate> I substituted the angle brackets for square brackets - not sure how to post them. The code is in the MainWindowResourses.xaml and the code starts on line 19. Anyone know how I can do this in Silverlight ?? We don't have the DataType and I need to be able to tell the app that this View is associated with this ViewModel - so I can create a tab control with different view like the demo app. Cheers, EC

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• Breakpoints are ignored when debugging in Visual Studio 2008 on 64-bit system

  - by Arnold Zokas

  I'm trying to debug an ASP.NET web application in this environment: Windows Server Standard 2008 SP2 x64 Single-core CPU 4GB RAM Visual Studio 2008 with Remote Debugger SP1 .NET 3.5 Web Application running in IIS in 64-bit mode The code I am trying to debug is a simple event handler with some basic sequential code. What I observe is that breakpoints get randomly ignored and VS often exits debug mode when I try to step through the code. The code is compiled in debug mode. I've tried all the usual steps: iisreset, reboot VM, rebuild solution, reinstall Visual Studio. Any ideas?

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• Site Actions menu in SharePoint is WSS-like, whereas I have installed MOSS

  - by Graeme

  I had WSS installed on my VM and then uninstalled in order to install MOSS Enterprise I can see a lot of the MOSS stuff in the Central Administration pages but when I create a new web application and site collection, my Site Actions dropdown is showing the WSS version, i.e. Create, Edit Page and Site Settings as opposed to the MOSS menu which has View All Site Content, View Reports, Manage Content and Structure etc. I just tried deleting my web app and creating it all again but it's come back with the same thing again. Is somewhere remembering that I used to have WSS installed? (yes I know MOSS is built on top of WSS but you know what I mean!)

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• Why is the user.dir system property working in Java?

  - by Geo

  Almost every article I read told me that you can't have chdir in Java. The accepted answer to this question says you can't do it in Java. However, here's some of the stuff I tried : geo@codebox:~$ java -version java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing) Here's a test class I'm using : import java.io.*; public class Ch { public static void main(String[] args) { System.out.println(new File(".").getAbsolutePath()); System.setProperty("user.dir","/media"); System.out.println(new File(".").getAbsolutePath()); } } geo@codebox:~$ pwd /home/geo geo@codebox:~$ java Ch /home/geo/. /media/. Please explain why this worked. Can I use this from now on and expect it to work the same way on all platforms?

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• Silverlight WCF service acting strange

  - by Caleb Sandfort

  Hi I have a silverlight project that calls into a wcf service. Everything works fine on my local machine. However when I deploy to a virtual machine, with the exact same query the wcf service returns, but the result is empty. I've tried debugging, but have not been able to get it to break in the wcf service. Any ideas what the problem could be, or how I could go about debugging it? Thanks I figured out what the problem is, but am not sure what the solution is. In my silverlight project the wcf service I am referencing is http://localhost/.../SilverlightApiService.svc I used fiddler on my vm to see the request that was made and instead of trying to contact the above service, it was trying to contact: http:///.../SilverlightApiService.svc So, for some reason my machine name is getting inserted in there instead of localhost. Any thoughts on this would be appreciated.

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• WPF Validation with ContentPresenter

  - by Chris

  Hi, I have a WPF user control which needs to validate some fields. It is bound to a class implementing IDataErrorInfo. When I set the user control as the content of my ContentPresenter in another, already open, window, I can see validation occurring, and error messages being returned, however, I don't get any validation adorner - e.g. the default red outline. If I enter the field and leave it (triggering re-validation) the validation adorner appears. Also, if I show the user control in it's own window it shows the validation adorner immediately. (I'm using Caliburn IResults to do this underneath, e.g. Show.Dialog<VM>(); but I suspect this isn't related) Can anyone offer any suggestion why the validation adorners aren't appearing immediately. (I had guessed animation on my ContentPresenter ContentChanged, however, I have removed this and still experience the problem. thanks, Chris

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• How can I connect to Android with ADB over TCP?

  - by martinjd

  I am attempting to debug an application on a Motorola Droid but I am having some difficulty connecting to the device via USB. My development server is a Windows 7 64bit VM running in HyperV and so I cannot connect directly via USB in the guest or from the host. I installed a couple of different USB over TCP solutions but the connection appears to have issues since the adb monitor reports "devicemonitor failed to start monitoring" repeatedly. I was wondering if there is a way to connect directly from the client on the development machine to the daemon on the device using the network instead of the usb connection or possibly other viable options?

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• Why won't the VisualVM Profiler profile my application?

  - by Luke

  I've created a simple 1 file java application that iterates through a loop, calls some functions, allocates some memory, adds some numbers, etc. I run that application via eclipse's Run As->Java Application. The running application shows up in Java VisualVM under Local. I double click on that application and go to the Profiler tab. The default settings are: Start profiling from classes: my.main.package.** Do not profile classes: java.*, javax.*, sun.*, sunw.*, com.sun.* I click on CPU. The CPU and Memory buttons gray out. Nothing happens. The Status says profiling inactive. When my application terminates the Status says application terminated. What am I doing wrong here? Are there some settings I need to tweak? Do I need to set a VM flag when I launch my application?

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• Why is the JVM stack-based and the DalvikVM register based?

  - by aioobe

  I'm curious, why did Sun decide to make the JVM stack-based and Google decide to make the DalvikVM register based? I suppose the JVM can't really assume that a certain number of registers are available on the target platform, since it is supposed to be platform independent. Therefor it just postpones the register-allocation etc, to the JIT compiler. (Correct me if I'm wrong.) So the Android guys thought, "hey, that's inefficient, let's go for a register based vm right away..."? But wait, there are multiple different android devices, what number of registers did the Dalvik target? Are the Dalvik opcodes hardcoded for a certain number of registers? Do all current Android devices on the market have about the same number of registers? Or, is there a register re-allocation performed during dex-loading? How does all this fit together?

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• bundle .NET dlls to run application in .NET-less machine?

  - by Camilo Martin

  AFAIK, ngen turns MSIL into native code (also reffered to as pre-JIT), however I never payed too much attention at it's startup performance impact. Ngen'd applications still require the .NET base class libraries (the runtime). Since the base class libraries have everything our .NET assemblies need (correct?) would it be possible to ship the framework's DLLs with my ngen'd application so that it does not require the runtime to be installed? (e.g., the scenario for most Windows XP machines) Oh, and please don't bother mentioning Remotesoft's Salamander Linker or Xenocode's Postbuild. They are not for my (and many's) current budget (and they seem to simply bundle the framework in a virtualized enviroinment, which means big download sizes and slow startup times I believe) EDIT: I know now, ngen doesn't do what I thought it did. But is it possible to bundle the .NET files with an application, without using a VM?

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• Why does jruby complain about valid java_opts

  - by brad

  I have set my java min/max heap size to be the same as outlined in the Sun Docs for precise heap sizing using the following: -Xms768m -Xmx768m This works fine when I start tomcat, but if I run jruby from the command line it complains saying: Error occurred during initialization of VM Incompatible minimum and maximum heap sizes specified I read in the jruby docs about some -J-X params but it seems silly that I would need to explicitly override my normal jvm settings. The problem arises when I do a deploy. I try running jruby -S rake db:migrate on my server and it complains. Is it true that I need to explicitly override my JVM settings when running jruby? It seems as though ANY Xms/Xmx values cause jruby to complain. Update So it seems that some settings do in fact work. For instance all of these work: Xmx256m Xms256m Xmx512m Xms256m Xmx512m Xms500m But these don't: Xmx512m Xms512m Xmx512m Xms501m Xmx768m Xms512m

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