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• Load balancing and sessions

  - by vtortola

  Hi there, What is the better approach for load balancing on web servers? My services run in .NET and Mono, so they could be hosted on IIS or Apache2, and the will have to provide SSL connection. I've read two main approaches, store the state in a common server and use sticky sessions, there is any other else? I've read 3 diffent things about sticky sessions: 1)the load balancing device will know with which server did you start the connection and all the further connections from that host will be routed to the same server. 2)the load balancing devide read a cookie named: JSESSIONID 3)the load balancing devide read a cookie named: ASPSESSIONID I'm a little bit confused, what will happen exactly? As the connections will be SSL there is not a chance for the load balancing devide of read the cookies, so then what? About store the estate in a common server, what solutions do you know? I've read memcache is a good solution but is there any other else? Cheers.

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• Good examples of MVVM Template

  - by jwarzech

  I am currently working with the Microsoft MVVM template and find the lack of detailed examples frustrating. The included ContactBook example shows very little Command handling and the only other example I've found is from an MSDN Magazine article where the concepts are similar but uses a slightly different approach and still lack in any complexity. Are there any decent MVVM examples that at least show basic CRUD operations and dialog/content switching? Everyone's suggestions were really useful and I will start compiling a list of good resources Frameworks/Templates WPF Model-View-ViewModel Toolkit MVVM Light Toolkit Prism Caliburn Cinch Useful Articles Data Validation in .NET 3.5 Using a ViewModel to Provide Meaningful Validation Error Messages Action based ViewModel and Model validation Dialogs Command Bindings in MVVM More than just MVC for WPF MVVM + Mediator Example Application Additional Libraries WPF Disciples' improved Mediator Pattern implementation(I highly recommend this for applications that have more complex navigation)

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• Disable browser 'Save Password' functionality

  - by mattsmith321

  One of the joys of working for a government healthcare agency is having to deal with all of the paranoia around dealing with PHI (Protected Health Information). Don't get me wrong, I'm all for doing everything possible to protect people's personal information (health, financial, surfing habits, etc.), but sometimes people get a little too jumpy. Case in point: One of our state customers recently found out that the browser provides the handy feature to save your password. We all know that it has been there for a while and is completely optional and is up to the end user to decide whether or not it is a smart decision to use or not. However, there is a bit of an uproar at the moment and we are being demanded to find a way to disable that functionality for our site. Question: Is there a way for a site to tell the browser not to offer to remember passwords? I've been around web development a long time but don't know that I have come across that before. Any help is appreciated. Thanks, Matt

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• How can you get NVelocity to initialize correctly?

  - by Deane

  I can't get NVelocity to initialize. I'm not trying to do anything complicated, so it's just fine if it initializes at the defaults, but it won't even do that. This: VelocityEngine velocity = new VelocityEngine(); ExtendedProperties props = new ExtendedProperties(); velocity.Init(props); Results in: "It appears that no class was specified as the ResourceManager..." So does this: VelocityEngine velocity = new VelocityEngine(); velocity.Init(); I can find precious little documentation on what the properties should be, nor how to get it to initialize with the simple defaults. Can anyone point to a resource? A lot of pages point back to this page: http://www.castleproject.org/others/nvelocity/usingit.html But this page skips over the (seemingly) most important point -- how to set the properties and what to set them to. I just want to load a simple template from a file.

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• Serving east/west coasts with Geoipdns and MaxMind GeoLite data

  - by netvope

  I want to serve east (west) coast visitors with my Virginia (California) server. To do so, I plan to use Geoipdns and the IP-to-location mappings from MaxMind. MaxMind provide two datasets for free: GeoLite Country and GeoLite City. However, neither of them has east/west coast regions defined. A possible solution is to write a script to combine all the IP ranges for the east/west coast cities in GeoLite City, but that sounds a little bit stupid. What is the best practice in doing this? Any suggestions or alternatives?

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• Silverlight: DataContractSerializer cannot handle read only collection properties

  - by moonground.de

  Hey Stackoverflowers :) For our Silverlight Project (SL4) I'm using a Model which might contain Lists (IList<AnotherModel>). According to good practice and rule CA2227:CollectionPropertiesShouldBeReadOnly the IList properties don't have a public setter. We serialize the Model using the DataContractSerializer which is working. But when I try to deserialize, a SecurityException is thrown by DataContractSerializer's ReadObject(Stream) Method, complaining that the target property (pointing to the IList property) cannot be set due to a missing public setter. Since the DataContractSerializer is sealed and neither extendable nor flexible so I currently see no chance to add some kind of additional rules which allow to deserialize the ILists using a foreach-loop on Add() method or some other method of transferring the collection items. I've also tried to dig into DataContractSerializer source (using Reflector) to create a little fork but it looks like i'd have to dig very deep and replicating whole serialization classes doesn't seem to be a viable solution. Do you see another chance to serialize a List with no public setter using the DataContractSerializer? Thank you very much in advance for your ideas! Thomas

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• .net WCF DateTime

  - by freddy smith

  I want to be able to safely send DateTime's over WCF without having to worry about any implicit or automatic TimeZone conversions. The dates I want to send are "logical" dates. year month day, there should be no time component. I have various server processes and client process that run on a variety of machines with different TimeZone settings. What I would like to ensure is that when a user enters a date in a textfield (or uses a date picker component) on any client that exact what they see at data entry is what is sent over WCF, used by the server and seen by other clients when they request the data. I am a little confused by the various questions and answers on this site concerning DateTime.Kind (unspecified, UTC, local).

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• Visual Studio 2010 and TFS 2008: Building unit test projects

  - by Peter

  Hi, We are currently taking VS2010 for a testdrive and so far we are a little stumped with how it just won't cooperate with our existing Team Foundation Server 2008. We still have all our projects on .NET 3.5 and whenever we are now building a solution that contains a unit test project (which automatically builds in .NET 4.0) the TFS won't build it. The .NET 4.0 framework is installed on the TFS 2008. The error we're receiving is: [Any CPU/Release] c:\WINDOWS\Microsoft.NET\Framework\v3.5\Microsoft.Common.targets(0,0): warning MSB3245: Could not resolve this reference. Could not locate the assembly "Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors. As a temporary workaround we are now forced to remove all our test projects in order for our solutions to build.

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• Determing software estimates and tracking past estimates

  - by Casey

  I know that this probably has as many answers as users here on SO, but software estimation always seemed like an esoteric science. Software developers don't have a magic book to refer to as exist in many other industries. I've been spending the last couple of days working on putting together some estimates for a bit of work that I am proposing for a freelance project that I am working on and am having trouble getting it down. I'm not experienced with any real software estimation practices and am trying to go from the gut based on my experience but also trying to be a little loose (not too loose though) on the estimates to leave me a bit of room to work. I read this blog entry http://blogs.popart.com/2007/07/what-scotty-from-star-trek-can-teach-us-about-managing-expectations/ that was linked to from SO and would like to start tracking my estimates at work as well even though I'm not really required to create estimates there. What tools or techniques would you recommend? Also, how much padding do you usually add in to a time estimate?

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• TortoiseSVN svnadmin

  - by PetPaulsen

  Currently im setting up TortoiseSVN and reading through docs etc. The manual often mentions svnadmin. I figured out, that I have to download it seperatly. But the link seems to be old. After some browsing I got here. But I can't find a version 1.6.7, like my TortoiseSVN installation. Also I'm a little bit lost, because of the many files. So where can I get svnadmin from?

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• Fortran arrays and subroutines

  - by ccook

  I'm going through a Fortran code, and one bit has me a little puzzled. There is a subroutine, say SUBROUTINE SSUB(X,...) REAL*8 X(0:N1,1:N2,0:N3-1),... ... RETURN END Which is called in another subroutine by: CALL SSUB(W(0,1,0,1),...) where W is a 'working array'. It appears that a specific value from W is passed to the X, however, X is dimensioned as an array. What's going on?

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• Cygwin socket & thread & other programming issues (some question about Cygwin)

  - by SjB

  I have some question about cygwin : Can I use Cygwin develop socket based code? Does Cygwin have read() and write() functions that work with file descriptors? Can I use Pthread library in Cygwin? Does code that compiles in Cygwin also compile in Linux without any change or with little change? Will an executable file that built by Cygwin run in Linux ? Why does Cygwin not need the linker option -lpthread when I use pthread library? why in #include <iostream> don't I need to use using namespace std; ? Can I work with QT in Cygwin? If so, How?

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• Is Objective C fast enough for DSP/audio programming

  - by morgancodes

  I've been making some progress with audio programming for iPhone. Now I'm doing some performance tuning, trying to see if I can squeeze more out of this little machine. Running Shark, I see that a significant part of my cpu power (16%) is getting eaten up by objc_msgSend. I understand I can speed this up somewhat by storing pointers to functions (IMP) rather than calling them using [object message] notation. But if I'm going to go through all this trouble, I wonder if I might just be better off using C++. Any thoughts on this?

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• How to handle Append Only text fields in a Sharepoint DataSheet view?

  - by Telos

  We've created a Sharepoint site to track a process. Eventually we're going to make a workflow out of it, but in the meantime there's a list we all have to look at which lists the various dates each piece is supposed to be finished. So basically My group needs to see and update columns X, Y, Z and Comments while ignoring the other 30 billion or so columns. Which is great in datasheet view because we can easily view our columns, and update them right there without drilling into the item and browsing through all the other crap we don't need. The problem is the Comments field, in which we really need to see the last actual comment made. Unfortunately whenever anyone saves the record the field is updated with a blank value (unless they entered a comment) and the last actual comment is lost unless you drill into the item. Is there some way to get the Datasheet view to show all the entries? I should also note that I know very little about Sharepoint 2007... so detailed answers would be nice!

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• MVC2 Binding isn't working for Html.DropDownListFor<>

  - by devlife

  I'm trying to use the Html.DropDownListFor< HtmlHelper and am having a little trouble binding on post. The HTML renders properly but I never get a "selected" value when submitting. <%= Html.DropDownListFor( m => m.TimeZones, Model.TimeZones, new { @class = "SecureDropDown", name = "SelectedTimeZone" } ) %> [Bind(Exclude = "TimeZones")] public class SettingsViewModel : ProfileBaseModel { public IEnumerable TimeZones { get; set; } public string TimeZone { get; set; } public SettingsViewModel() { TimeZones = GetTimeZones(); TimeZone = string.Empty; } private static IEnumerable GetTimeZones() { var timeZones = TimeZoneInfo.GetSystemTimeZones().ToList(); return timeZones.Select( t = new SelectListItem { Text = t.DisplayName, Value = t.Id } ); } } I've tried a few different things and am sure I am doing something stupid... just not sure what it is :)

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• Ruby/Rails display general screen when modifications being performed on server

  - by john chan

  I have a ruby on rails app running a server and sometimes it needs to be taken down for updates/etc. As of now, one way I see to have a general display screen during update periods (when the app is down) is to substitute the files within /srv/www/ directory to just have it display a general screen everywhere that the user could possibly navigate to. I also thought of having a central controller file that connects all others (essentially a main) but this seems counter intuitive for rails. There are many external links to these different components of the site that the user could navigate to from outside and I need to make sure that they always receive this general update screen when the app is taken down for a little. I was wondering if anyone had any other ideas.... maybe a library or something like that, I can't seem to find anything online. any suggestions would be appreciated. Thanks

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• C++ _beginthreadex in cygwin

  - by Hugh

  Hello all, I am aware that _beginthreadex is part of the MSCVRT functions and therefore not accessible via Cygwin/MinGW uintptr_t _beginthreadex( void *security, unsigned stack_size, unsigned ( __stdcall *start_address )( void * ), void *arglist, unsigned initflag, unsigned *thrdaddr ); However, _beginthreadex does call upon CreateThread(). HANDLE CreateThread( LPSECURITY_ATTRIBUTES secAttr, SIZE_T stackSize, LPTHREAD_START_ROUTINE threadFunc, LPVOID param, DWORD flags, LPDWORD threadID ); However, does anyone have a wrapper or a URL to a library that is compatible with Cygwin/WinGW. Or can offer some advice? As this is the last little piece of moving from VSutdio Project over to makefiles for Windows/Darwin/Linux. Thanks.

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• Reading a plist utf-8 value as utf-16

  - by ennuikiller

  I'm working on an iphone app that needs to display superscripts and subscripts. I'm using a picker to read in data from a plist but the unicode values aren't being displayed corretly in the pickerview. Subscripts and superscripts are not being recognized. I'm assuming this is due to the encoding of the plist as utf-8, so the question is how do a convert a plist string encoding from utf-8 to utf-16 ? Just a little more elaboration: If I do this it displays properly at least in a textfield: NSString *equation = @"x\u00B2 + y\u00B2 = z\u00B2" However if I define the same string in a plist and try to read it in and assign it to a string and display it on a pickerview it just displays the the encoding and not the superscripts. @Matt: thanks for your suggestion the unicode is being escaped that is \u00B2 = \u00B2. Googling for "escaped values in plists" returned no useful results, and I haven't been able to use the keyboard cmd-ctrl-shift-+ to work. Any further suggestions would be greatly appreciated!!

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• Tutorial: Simple WCF XML-RPC client

  - by mr.b

  Update: I have provided complete code example in answer below. I have built my own little custom XML-RPC server, and since I'd like to keep things simple, on both server and client side, what I would like to accomplish is to create a simplest possible client (in C# preferably) using WCF. Let's say that Contract for service exposed via XML-RPC is as follows: [ServiceContract] public interface IContract { [OperationContract(Action="Ping")] string Ping(); // server returns back string "Pong" [OperationContract(Action="Echo")] string Echo(string message); // server echoes back whatever message is } So, there are two example methods, one without any arguments, and another with simple string argument, both returning strings (just for sake of example). Service is exposed via http. Aaand, what's next? :)

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• How to pass string file path as HttpPostedfile to fileupload control?

  - by rahul

  Hi friends, I have got little tricky issue i.e I am using API of a product which has few methods for uploading image. The UI part of the product has one file upload control which takes files and convert that into binary and save it to database. In the coding part they are using one method where they send this fileupload.postedfile as one of the input parameter to the method. Now my requirement is, I have a directory where there are hundred of files which i have to send each file one by after another to this method as a input. Now i wish to know how to pass a file name as "HttpPostedFile" to that method as a parameter. I have no other option other than using that API (our clients requirement). Thanks

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• RadComboBox Just Freezes

  - by ProfK

  I have two examples now, my first two, where a place a RadComboBox on a web form, and populate it, but it won't drop down. I first picked this up on a big web application project, and then on a simple little web site project, for investigating this. In my sample project, it is the only control on the page besides the ScriptManager, and there are rows in the data source, and it does display the first row, but it just doesn't drop down. Any ideas on this? BTW, this is theh first time I've restored this project onto a new XP machine, where I previously was working on a Vista machine that died.

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• iphone basic game loop

  - by Mrigank Gupta

  I am little confused with my Opengl game loop. as I am skipping touch events some times. My game loop is some thing like this.. I have ScreenManager which draw and update all game screens who so ever has control.In update I am checking input of all screen also. if input state changes, then whichever screen has control, consume touches. EaglView draw update | | ScreenManager.draw ScreenManager.update -> handle input stack ___________ ___________ of ___________ ___________ screen ___________ ___________ Problem comes.. I am changing input state as touch begun and end methods called. but sometimes In my game loop both touchbegun/end methods get called between two updates and I am missing events. I guess approach is not good. can you guys share your approach to this problem.

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• SSRS 2008 - How to hide the plus icon in a group visibility toggle cell

  - by Daniel Coffman

  I have a report that shows or hides columns in a group based on a header cell. SSRS makes this pretty easy and is kind enough to place a little plus/minus icon in the toggling cell. I want to HIDE this plus/minus icon when there is only one column of data in the subgroup, because it shows that one column by default so expanding the group doesn't do anything. This really only applies to one specific group, because all the others always have more than one column of data, so a way to hide only the icon for a specific group would be fine. JavaScript won't work (I don't think) because the client ID of the plus/minus image is generated by the report and changes with each generation. see this image for more clarity: http://imgur.com/vqaQA.png

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• QTableWidget signal cellChanged(): distinguish between user input and change by routines

  - by crabman

  i am using PyQt but my question is a general Qt one: I have a QTableWidget that is set up by the function updateTable. It writes the data from DATASET to the table when it is called. Unfortunately this causes my QTableWidget to emit the signal cellChanged() for every cell. The signal cellChanged() is connected to a function on_tableWidget_cellChanged that reads the contents of the changed cell and writes it back to DATASET. This is necessary to allow the user to change the data manually. So everytime the table is updated, its contents are written back to DATASET. Is there a way to distinguish if the cell was changed by the user or by updateTable? i thought of disconnecting on_tableWidget_cellChanged by updateTable temporarily but that seems to be a little dirty.

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• Jquery Uploadify checkscript

  - by Kevin McPhail

  I am trying to implement the checkscript feature of uploadify in an asp.net mvc view but i can't determine what the key is i should be using on the controller side. Below is the php script but i am not very familiar with php and can't determine what php is scraping out of the httprequest. Has anyone implemented this? The documentation is a little sparse (as in nonexistent). $fileArray = array(); foreach ($_POST as $key => $value) { if ($key != 'folder') { if (file_exists($_SERVER['DOCUMENT_ROOT'] . $_POST['folder'] . '/' . $value)) { $fileArray[$key] = $value; } } } echo json_encode($fileArray); ?>

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