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• WPF: Sort of inconsistence in the visual appearence of WPF controls derived by Selector class

  - by msfanboy

  Hello, focused items == selected items but selected items != focused items. Have you ever wondered about that? Do you specially style the backcolor of a focused/selected item ? I ask this question because a user has an enabled button because some customer items are selected. The user is wondering now "why the heck can I delete this customers (button is enabled...) when I have just clicked on the orders control selecting some orders ready to delete (button is enabled too). The thing is the selected customer items are nearly looking grayed out in the default style... Well its sort of inconsistence to the user NOT to the programmer because WE know the behavior. Do you cope with stuff like that?

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• devIL causes program to be unable to start correctly

  - by Mark

  I just tried to use devIL and ULIT to help me with opengl texture loading. However, whenever the program starts, I get the error: "The application was unable to start correctly (0xc000007b). Click OK to close the application." What happened? I'm using the Visual C++ 2010 RC, windows 7 64-bit.

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• best way to store 1:1 user relationships in relational database

  - by aharon

  What is the best way to store user relationships, e.g. friendships, that must be bidirectional (you're my friend, thus I'm your friend) in a rel. database, e.g. MYSql? I can think of two ways: Everytime a user friends another user, I'd add two rows to a database, row A consisting of the user id of the innitiating user followed by the UID of the accepting user in the next column. Row B would be the reverse. You'd only add one row, UID(initiating user) followed by UID(accepting user); and then just search through both columns when trying to figure out whether user 1 is a friend of user 2. Surely there is something better?

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• database splitting; multiple tables

  - by Ben

  I am coding a classifieds ad web app. What is the optimal way to structure the database for this? Because of the high repeatability, would it be faster (in terms of searching/indexing) to have a separate table in the database for each city? Or would it be okay to just have one table for every city (it would have a lot of rows..). The classifieds table has id, user_id, city_name, category,[description and detail fields].

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• Self Hosting Languages

  - by Pierreten

  This is completely blowing my fucking mind right now, how can a language run itself? http://en.wikipedia.org/wiki/Self-hosting

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• MySqlDateTime to System.DateTime conversion

  - by bowsa

  Ok I'm very new to databases and C# in general, but I'm using a piece of code that exports dataset data to an Excel file, and its taking issue with the date/time format. I'm using the MySQL connector so the rowtype is MySql.Data.Types.MySqlDateTime. Is there any quick way to convert it into System.DateTime so I can slot it straight into the case statement? Here's a link to the code I used, I copied it verbatim so I've not copied and pasted it here. It throws a MySql.Data.Types.MySqlDateTime not handled exception: Code Project Thanks in advance for any help.

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• Facing problem in accessing webservice

  - by Muhammad Waqas

  System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.Web.Services2.WebServicesExtension.AfterSerializeServer(SoapServerMessage message) Above exception is thrown whenever i try to access any method of webservice on another machine. Regards, Muhammad Waqas

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• mysql unique-constraint

  - by Cypher

  I have two tables -- Variables (id, name) and Variable_Entries (id, var_id, value). I want each variable to have a unique set of entries. If I make the value entry unique then a different variable won't be able to have that same value which is not right. Is there some way to make the value column unique for identical var_id's?

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• What makes MVVM uniquely suited to WPF?

  - by Reed Copsey

  The Model-View-ViewModel is very popular with WPF and Silverlight. I've been using this for my most recent projects, and am a very large fan. I understand that it's a refinement of MVP. However, I am wondering exactly what unique characteristics of WPF (and Silverlight) allow MVVM to work, and prevent (or at least make difficult) this pattern from working using other frameworks or technologies. I know MVVM has a strong dependency on the powerful data binding technology within WPF. This is the one feature which many articles and blogs seem to mention as being the key to WPF providing the means of the strong separation of View from ViewModel. However, data binding exists in many forms in other UI frameworks. There are even projects like Truss that provide WPF-style databinding to POCO in .NET. What features, other than data binding, make WPF and Silverlight uniquely suited to Model-View-ViewModel?

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• Tools to create class methods interaction diagram

  - by nightcoder

  Let's say I have a MyClass class, with various methods, and let's say that method MyClass.A() calls methods MyClass.B() which calls MyClass.C(). Method MyClass.A() also calls MyClass.D() which also calls MyClass.C() and so on :) Is there any tool to visualize this as a diagram? UPD. I see NDepend can do what I need but it costs too much when I just need to build methods dependency graph and trial limitations are too big (I can't zoom the graph and I can't see anything on a small resulted graph without being able to zoom). So, I'm still looking for alternatives - it should be free or not expensive tool.

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• MVC implementation/best-practices question

  - by Vivin Paliath

  I have to work with some code that isn't truly MVC (i.e., it doesn't use an explicit framework among other things). Right now we make do with servlets that pass data to services. Here is my problem. I am receiving a post to a servlet that contains a whole bunch of address data that I have to save to the database. The data is (obviously) in the HttpRequest object. My question is, how do I pass this data into a service? I am reluctant to do it like this: AddressService.saveAddress(request); Because I don't think the service should have a dependency on the request. My other option is to do something like this: String addressLine = request.getParameter("addressLine"); .. .. about 7 other parameters .. String zip = request.getParameter("zip"); AddressService.saveAddress(addressLine, ... 7 other parameters ..., zip); But I don't like having a function with a huge number of parameters either. I was thinking of making an intermediate object called AddressData that would hold data from the request, and then passing that into the service. Is that an acceptable way of doing things?

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• Intellisense in App_Code in VS2010

  - by nikok

  Hi, I've just upgrade my web application from vs2008 to vs2010, I create a new web app from vs2010, then copy across all the existing files from vs2008, then I add a new class file to App_Code folder, the intellisense is not showing up for everything and class etc is also not color in the right color. However, when I open the existing class I created earlier from vs2008, intellisense just working fine and all classes are in different color as well, if I make a copy of existing class, the copied class does not support the intellisense as well. However, if I shut my VS, and reopen it, they all appear to be support with intellisense for existing class, but once I created a new class, intellisense is not support. Can you tell me what's wrong here? Thanks

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• How to get common library to read App.config of current executable

  - by Rob Segal

  I have a common library and two executables. Each executable refers to the common library for some functionality. I would like the common library to read from the app.config of the exe which is currently running. Is there specific API calls to do this?

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• How to structure a Genetic Algorithm class hierarchy?

  - by MahlerFive

  I'm doing some work with Genetic Algorithms and want to write my own GA classes. Since a GA can have different ways of doing selection, mutation, cross-over, generating an initial population, calculating fitness, and terminating the algorithm, I need a way to plug in different combinations of these. My initial approach was to have an abstract class that had all of these methods defined as pure virtual, and any concrete class would have to implement them. If I want to try out two GAs that are the same but with different cross-over methods for example, I would have to make an abstract class that inherits from GeneticAlgorithm and implements all the methods except the cross-over method, then two concrete classes that inherit from this class and only implement the cross-over method. The downside to this is that every time I want to swap out a method or two to try out something new I have to make one or more new classes. Is there another approach that might apply better to this problem?

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• In a One to One relationship should i drop one of the table's id column?

  - by Vlad

  I have the following 2 tables in MySQL: Customer(Id, Firstname, Lastname...) Bonus(Id, CustomerId, Value, ...) The relation is One-To-One, every customer has only one bonus.(the CustomerId is unique in the Bonus Table) Q: Should I drop the Id column of the Bonus table? (I want to know why or why not)

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• ExpectedExceptionAttribute is not working in MSTest

  - by Micah

  This is wierd, but all of a sudden the `ExpectedExceptionAttribute' quit working for me the other day. Not sure what's gone wrong. I'm running VS 2010 and VS 2005 side-by-side. It's not working in VS 2010. This test should pass, however it is failing: [TestMethod] [ExpectedException(typeof(ArgumentNullException))] public void Test_Exception() { throw new ArgumentNullException("test"); } Any ideas? This really sux.

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• Choosing colors that convert nicely to greyscale

  - by svrist

  If I'm designing af tool that must "screenshot" well for printed documentation, can I easily choose colors that look different even when printed in greyscale?

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• What's missing in Cocoa?

  - by Bridgeyman

  If you could add anything to Cocoa, what would it be? Are there any features, major or minor, that you would say are missing in Cocoa. Perhaps there is a wheel you have had to invent over and over because of an omission in the frameworks?

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• Any sample C# project that highlights separate data access layer (using EF) to business logic layer

  - by Greg

  Hi, I'm interested in having a look at a small sample project that would highlight a good technique to separate data access layer (using Entity Framework) to business logic layer. In C# would be good. That is, it would highlight how to pass data between the layer without coupling them. That is, the assumption here is not to use the EF classes in the Business Logic layer, and how to achieve this low coupling, but minimizing plumbing code.

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• algorithm diagram

  - by tunl

  This is the max searching algorithm diagram: So, I wonder how can draw diagram for Recursion in HaNoi Tower program: package tunl; public class TowersApp { static int n = 3; public static void main(String[] args) { TowersApp.doTowers(3, 'A', 'B', 'C'); } public static void doTowers(int n, char from, char inter, char to) { if (n == 1) { System.out.println("disk 1 from "+ from + " to " + to); } else { doTowers(n-1, from, to, inter); System.out.println("disk " + n + " from " + from + " to " + to); doTowers(n-1, inter, from, to); } } } I can't draw it. Anyone can help me !!!

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• SQL Server: pulling and updating local data

  - by SDReyes

  Hi guys, I have two SQL Server 2008 databases called Anna and Bob. Bob has to pull and transform data from Anna to keep updated his tables. Ideally Bob will be always synchronized with Anna, but some delay would be acceptable. What is the best way to do this? Thanks in advance.

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• How to list all attached USB devices in Visual C++

  - by vinzenzweber

  In Short: I need to detect hotplug events of my USB CDC device by PID/VID and get the corresponding virtual COM port which was created by Windows in Visual C++ and in the end create a dll. I have a USB CDC device which I need to be notified of when connected/disconnected on Windows. My approach is to use RegisterDeviceNotification and an "invisible" Window to receive WM_DEVICECHANGE notifications. This part is working so far. Now as far as I found out I need to get the list of USB devices that is plugged, iterate over it and filter out the devices with my PID/VID? I assume that I am then able to get more informations about the device including the COM port? Is the only way to achieve my goal to use SetupDi calls in setupapi.h? Is using WDK / DDK the only way to achieve my goal? As soon as that is working I open-source it on http://github.com/vinzenzweber/USBEventHandler. The Mac version is available already!

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• silverlight 3 navigation page not availble in VS as item to add

  - by Steve Brownell

  I've recently upgraded my computer from Vista Home Premium 64-bit to Windows 7 Home Premium 64-bit. I've re-installed VS 2008 web express, and re-installed all the silver light sdk's, tools, etc. But now when I want to add a Silverlight Navigation Page, it is not avialble to me in the list of items that can be added. The navigation dll is installed, as my project existed before the OS upgrade. The program still runs just fine as is, but I want to add another navigation page item to the project, and I'm stumped for how to do it. Any ideas? Thanks, Steve

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• Question - Should I use SPItemReceiver or SPEmailEventReceiver

  - by RiverStorm

  Hello, I have custom SharePoint Document Library which I use to upload spreadsheet data into a database. When a spreadsheet is uploaded, the SPItemReceiver triggers, and upload the data. Now, I would like to add an incoming email feature to the document library. My question is...after the document library has received the spreadsheet by email. Should I use the override-able method EmailReceived of the SPEmailEventReceiver to process the data in the spreadsheet or still use the SPItemReceiver? I gather I could use either, but I would like to know your opinion which is better and why. Thanks in advance

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• A generic error in GDI+ with ToolStrip in ManagerRenderMode

  - by volody

  I have a vb.net form with ToolStrip menu RenderMode - ManagerRenderMode LayoutStyle - HorizontalStackWithOverflow My development environment is .net 4.0, VS2010, windows 7 x64; but occasionally I am getting next error A generic error occurred in GDI+. Stacktrace: at System.Drawing.Graphics.CheckErrorStatus(Int32 status) at System.Drawing.Graphics.FillRectangle(Brush brush, Int32 x, Int32 y, Int32 width, Int32 height) at System.Drawing.Graphics.FillRectangle(Brush brush, Rectangle rect) at System.Windows.Forms.ToolStripProfessionalRenderer.FillWithDoubleGradient(Color beginColor, Color middleColor, Color endColor, Graphics g, Rectangle bounds, Int32 firstGradientWidth, Int32 secondGradientWidth, LinearGradientMode mode, Boolean flipHorizontal) at System.Windows.Forms.ToolStripProfessionalRenderer.RenderToolStripBackgroundInternal(ToolStripRenderEventArgs e) at System.Windows.Forms.ToolStripProfessionalRenderer.OnRenderToolStripBackground(ToolStripRenderEventArgs e) at System.Windows.Forms.ToolStripRenderer.DrawToolStripBackground(ToolStripRenderEventArgs e) at System.Windows.Forms.ToolStrip.OnPaintBackground(PaintEventArgs e) at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer) at System.Windows.Forms.Control.WmPaint(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

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