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  • Stumbling Through: Visual Studio 2010 (Part IV)

    So finally we get to the fun part the fruits of all of our middle-tier/back end labors of generating classes to interface with an XML data source that the previous posts were about can now be presented quickly and easily to an end user.  I think.  Well see.  Well be using a WPF window to display all of our various MFL information that weve collected in the two XML files, and well provide a means of adding, updating and deleting each of these entities using as little code as possible.  Additionally, I would like to dig into the performance of this solution as well as the flexibility of it if were were to modify the underlying XML schema.  So first things first, lets create a WPF project and include our xml data in a data folder within.  On the main window, well drag out the following controls: A combo box to contain all of the teams A list box to show the players of the selected team, along with add/delete player buttons A text box tied to the selected players name, with a save button to save any changes made to the player name A combo box of all the available positions, tied to the currently selected players position A data grid tied to the statistics of the currently selected player, with add/delete statistic buttons This monstrosity of a form and its associated project will look like this (dont forget to reference the DataFoundation project from the Presentation project): To get to the visual data binding, as we learned in a previous post, you have to first make sure the project containing your bindable classes is compiled.  Do so, and then open the Data Sources pane to add a reference to the Teams and Positions classes in the DataFoundation project: Why only Team and Position?  Well, we will get to Players from Teams, and Statistics from Players so no need to make an interface for them as well see in a second.  As for Positions, well need a way to bind the dropdown to ALL positions they dont appear underneath any of the other classes so we need to reference it directly.  After adding these guys, expand every node in your Data Sources pane and see how the Team node allows you to drill into Players and then Statistics.  This is why there was no need to bring in a reference to those classes for the UI we are designing: Now for the seriously hard work of binding all of our controls to the correct data sources.  Drag the following items from the Data Sources pane to the specified control on the window design canvas: Team.Name > Teams combo box Team.Players.Name > Players list box Team.Players.Name > Player name text box Team.Players.Statistics > Statistics data grid Position.Name > Positions combo box That is it!  Really?  Well, no, not really there is one caveat here in that the Positions combo box is not bound the selected players position.  To do so, we will apply a binding to the position combo boxs SelectedValue to point to the current players PositionId value: That should do the trick now, all we need to worry about is loading the actual data.  Sadly, it appears as if we will need to drop to code in order to invoke our IO methods to load all teams and positions.  At least Visual Studio kindly created the stubs for us to do so, ultimately the code should look like this: Note the weirdness with the InitializeDataFiles call that is my current means of telling an IO where to load the data for each of the entities.  I havent thought of a more intuitive way than that yet, but do note that all data is loaded from Teams.xml besides for positions, which is loaded from Lookups.xml.   I think that may be all we need to do to at least load all of the data, lets run it and see: Yay!  All of our glorious data is being displayed!  Er, wait, whats up with the position dropdown?  Why is it red?  Lets select the RB and see if everything updates: Crap, the position didnt update to reflect the selected player, but everything else did.  Where did we go wrong in binding the position to the selected player?  Thinking about it a bit and comparing it to how traditional data binding works, I realize that we never set the value member (or some similar property) to tell the control to join the Id of the source (positions) to the position Id of the player.  I dont see a similar property to that on the combo box control, but I do see a property named SelectedValuePath that might be it, so I set it to Id and run the app again: Hey, all right!  No red box around the positions combo box.  Unfortunately, selecting the RB does not update the dropdown to point to Runningback.  Hmmm.  Now what could it be?  Maybe the problem is that we are loading teams before we are loading positions, so when it binds position Id, all of the positions arent loaded yet.  I went to the code behind and switched things so position loads first and no dice.  Same result when I run.  Why?  WHY?  Ok, ok, calm down, take a deep breath.  Get something with caffeine or sugar (preferably both) and think rationally. Ok, gigantic chocolate chip cookie and a mountain dew chaser have never let me down in the past, so dont fail me now!  Ah ha!  of course!  I didnt even have to finish the mountain dew and I think Ive got it:  Data Context.  By default, when setting on the selected value binding for the dropdown, the data context was list_team.  I dont even know what the heck list_team is, we want it to be bound to our team players view source resource instead, like this: Running it now and selecting the various players: Done and done.  Everything read and bound, thank you caffeine and sugar!  Oh, and thank you Visual Studio 2010.  Lets wire up some of those buttons now There has got to be a better way to do this, but it works for now.  What the add player button does is add a new player object to the currently selected team.  Unfortunately, I couldnt get the new object to automatically show up in the players list (something about not using an observable collection gotta look into this) so I just save the change immediately and reload the screen.  Terrible, but it works: Lets go after something easier:  The save button.  By default, as we type in new text for the players name, it is showing up in the list box as updated.  Cool!  Why couldnt my add new player logic do that?  Anyway, the save button should be as simple as invoking MFL.IO.Save for the selected player, like this: MFL.IO.Save((MFL.Player)lbTeamPlayers.SelectedItem, true); Surprisingly, that worked on the first try.  Lets see if we get as lucky with the Delete player button: MFL.IO.Delete((MFL.Player)lbTeamPlayers.SelectedItem); Refresh(); Note the use of the Refresh method again I cant seem to figure out why updates to the underlying data source are immediately reflected, but adds and deletes are not.  That is a problem for another day, and again my hunch is that I should be binding to something more complex than IEnumerable (like observable collection). Now that an example of the basic CRUD methods are wired up, I want to quickly investigate the performance of this beast.  Im going to make a special button to add 30 teams, each with 50 players and 10 seasons worth of stats.  If my math is right, that will end up with 15000 rows of data, a pretty hefty amount for an XML file.  The save of all this new data took a little over a minute, but that is acceptable because we wouldnt typically be saving batches of 15k records, and the resulting XML file size is a little over a megabyte.  Not huge, but big enough to see some read performance numbers or so I thought.  It reads this file and renders the first team in under a second.  That is unbelievable, but we are lazy loading and the file really wasnt that big.  I will increase it to 50 teams with 100 players and 20 seasons each - 100,000 rows.  It took a year and a half to save all of that data, and resulted in an 8 megabyte file.  Seriously, if you are loading XML files this large, get a freaking database!  Despite this, it STILL takes under a second to load and render the first team, which is interesting mostly because I thought that it was loading that entire 8 MB XML file behind the scenes.  I have to say that I am quite impressed with the performance of the LINQ to XML approach, particularly since I took no efforts to optimize any of this code and was fairly new to the concept from the start.  There might be some merit to this little project after all Look out SQL Server and Oracle, use XML files instead!  Next up, I am going to completely pull the rug out from under the UI and change a number of entities in our model.  How well will the code be regenerated?  How much effort will be required to tie things back together in the UI?Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Finding .desktop files based on their titles?

    - by stwissel
    That's part 2 of a question asked earlier (to be able to give credit to the answers individually). When I type into the Dash applications show up with their title (also when hovering over the launcher), how can I find the associated desktop file. When I look into the usual suspect locations (/usr/share/applications and ~/.local/share/applications) with Nautilus I see the titles, but not the file names (not even in properties which sucks). When I look from the command line I see the file names but not the titles (a switch would be nice). How can I get a listing (a custom column?) that shows them next to each other?

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  • Master Data Management - The Trend Towards Multi-Domain and Other Realities

    - by Mala Narasimharajan
    In my quest to keep my fingers on the pulse of MDM, I recently found a pretty interesting article.  The article was published in Information Week and provides some interesting statistics from a recent survey conducted by the analyst firm, The Information Difference.  Let's take a look: Of the 130 organizations surveyed, 53% have live operational MDM implementations 81% of those with live operational MDM implementations report broad success - a huge improvement over 2011's 54% 64% developed a business case prior to their MDM deployment, while a daring 32% went ahead without a business case.    The article goes on to talk about the shift in vendors from focusing on customer data and product information management to one that is oriented around multi-domain master data management as well as other realities around MDM.  Take a look at the article. For more information on Oracle's master data management suite, click here. 

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  • Why isn't Chrome rendering images and fonts correctly?

    - by user287558
    I have an Acer monitor and an Intel Pentium 4 running 12.04 32-bit. Chrome renders all webpages like this: This is how CNN should look: I have Firefox installed and its images/fonts look fine. I am new to Ubuntu and comfortable with using Terminal. Beyond that, I have no idea what I'm doing. This happened all of a sudden a few weeks ago. Any suggestions would be very much appreciated. Thanks in advance.

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  • Chrome Mobile: The Mobile Web Developers Toolkit (Part 1)

    Chrome Mobile: The Mobile Web Developers Toolkit (Part 1) Building for mobile web requires a different mindset than desktop web development, and a different set of tools. The tools we're used to using often aren't available or would take up too much screen real estate. And going back to the dark ages of tweak/save/deploy/test/repeat isn't exactly optimal, so what can we do? Thankfully there are a number of great options - from remote debugging to emulation, mobile browsers are offering more and more tools to make our lives easier. We'll take a look at a couple of tools that you can use today to make cross platform mobile web development easier and then peer into the crystal ball to see what tools may bring in the future. Join us for Part 1 - as we take a look at a few boiler plates, frameworks and helpful libraries for building the mobile web. From: GoogleDevelopers Views: 0 0 ratings Time: 01:00:00 More in Science & Technology

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  • Excel duration converts to date

    - by Malcolm Anderson
    I'm working on an Excel 2010 spreadsheet and I'm trying to put in durations for some tasks I want to schedule.The interesting thing is that up until a few minutes ago, I couldn't do it.I was entering in "47:00" and excel was (and still is) converting it to "1/1/1900 23:00:00"In my mind, I want the value to be 47 minutes, but for the life of me I cannot find a fix for this behavior.Here's the weirdest thing, I haven't had this problem in the past.  Usually I put in times, add them up and they work like magic.  Put in 18 entries of 20 minutes each, total them and excel will usually tell me that it's a total of 6 hours.No problem.Today, problem.Here's the weird bit:As I was writing this post, I got it to work.By formatting the column as custom "[hh]:mm" and summing the columns, I can get total times.But the times are still being formatted into dates if I look at the underlying data.  Bottom line, if you need to calculate durations, you can, but don't look too closely at what is happening underneath the covers.

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  • Are people getting away with the "follow 1000s and then unfollow" Twitter trick? [closed]

    - by Baumr
    It seems that more and more people are trying to 'cheat' their way into more Twitter followers. The basic mechanism is: Follow thousands of people on Twitter with the hope that they'll follow you back. Once it reaches a point you're happy with, start gradually unfollowing them. That way, at the end of the day, it'll look like a lot of people follow you unconditionally. I've seen self-proclaimed social media and SEO experts do this. It's clear they want to look influential — and will use black hat social media tactics to do so. I can see how it can work, so is Twitter letting them get away with it? Should it?

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  • Silverlight 4 + RIA Services - Ready for Business: Exposing Data from Entity Framework

    To continue our series I wanted to look next at how to expose your data from the server side of your application.  The interesting data in your business applications come from a wide variety of data sources.  From a SQL Database, from Oracle DB, from Sql Azure, from Sharepoint, from a mainframe and you have likely already chosen a datamodel such as NHibernate, Linq2Sql, Entity Framework, Stored Proc, a service.   The goal of RIA Service in this release is to make it easy to...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • My Inbox: How to save changes coming from disconnected POCOs

    I receive a lot of random emails from developers with Entity Framework questions. (This is not a request for more! :)) If I’m too busy to even look or if it’s something I can’t answer off the top of my head, I swallow my pride and ask the person to try the MSDN forums. If the email is from a complete stranger and has gobs and gobs of code that email will surely get a "please try MSDN forums" reply.  But sometimes I’m not in my usual state of “too...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • DotNetNuke Gallery Module - 7 Videos

    In this tutorial we cover the Installation of the DotNetNuke Core Gallery Module and show you how to configure it correctly. We walk you through how to use all of the features in the Gallery module including creating albums, uploading files, bulk uploads, the slideshow, media files, watermarks, templates, and more. The videos contain: Video 1 - Introduction to the DNN Gallery Module, Installation and Basic Configuration Video 2 - How to Upload Images and Configure Their Settings Video 3 - Creating Gallery Albums and Bulk Uploading Video 4 - How to Add Files and Albums Using FTP, Adding Music and Changing Permissible Upload Types Video 5 - How to Add Video Files, How to Rate Files, Gallery Look and Feel Video 6 - Changing Feature Settings, Adding Watermarks, Gallery Security Roles Video 7 - Working with Private Galleries and Security Roles, Gallery Maintenance Total Time Length: 57minsDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • How should I define my Java Objects?

    - by HonorGod
    I have a data grid where I sort of show the following information - All Guests Total Adults = 22 Total Children = 27 Confirmed Total Adults = 9 Total Children = 13 Country = Germany Total Adults = 5 Total Childres = 6 Friends Adults = 2 Children = 2 Relatives Adults = 3 Children = 4 Country = USA Total Adults = 4 Total Childres = 7 Friends Adults = 2 Children = 5 Relatives Adults = 2 Children = 2 Tentative Total Adults = 13 Total Children - 14 Country = Australia Total Adults = 7 Total Childres = 8 Friends Adults = 2 Children = 3 Relatives Adults = 5 Children = 5 Country = China Total Adults = 6 Total Childres = 6 Friends Adults = 2 Children = 4 Relatives Adults = 4 Children = 2 And in the database what I have is data at the lowest level which is Friends / Relatives and the corresponding countries set as a look-up value which in indirectly connected to another look-up that can tell me if they fall under confirmed or tentative. I guess my question is how do I layout my Java Object and perform the aggregations and give it back to the client. I am not sure if I am clear with my question, but feel free to comment so I can update the question accordingly.

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  • SharePoint Conference 2012&ndash;How To Find Me

    - by MOSSLover
    Hey guys I will be at the conference if you don’t follow me on twitter and you want to find me.  Look around the Women in SharePoint area in the Community Lounge.  If you don’t find me at the Community Lounge then I would say try to look at the Planet Technologies booth for me.  If you don’t find me in that booth then try Booth #22 the SharePoint Pavilion.  If I’m not in any of these places I’m either in a session, sleeping, running, or wearing a cloaking device.  You can ask me all kinds of questions about Planet, Women in SharePoint, and such.  I can try to answer the questions as best I can or direct you to someone smarter.  See you all at SPC 12! Technorati Tags: SPC12,SharePoint

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  • Do you actually write 'clean code'?

    - by ykombinator
    I have seen some programmers tweaking their code over and over again not only to make it 'work good', but also to make it 'look good'. IMO, 'clean code' is actually a compliment indicating your code is elegant, perfectly understandable and maintainable. And the difference comes out when you have to choose between an aesthetically appealing code vs. code that's stressful to look at. So, how many of you actually write 'clean code'? Is it a good practice? What are the other benefits or drawbacks of this? EDIT: I came across the term 'girl-code' here.

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  • Tagging Objects in the AppFabric Cache

    In two of my previous entries I outlined functionality and patterns used in the AppFabric Cache.  In this entry I wanted to expand and look at another area of functionality that people have come to expect when working with cache technology.  This expectation is the ability to tag content with more information than just the key.  As you start to examine this expectation you will soon find yourself asking if the tagged data can be related to each other and finally if it is possible...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Silverlight 4 Twitter Client &ndash; Part 5

    - by Max
    In this post, we will look at implementing the following in our twitter client - displaying the profile picture in the home page after logging in. So to accomplish this, we will need to do the following steps. 1) First of all, let us create another field in our Global variable static class to hold the profile image url. So just create a static string field in that. public static string profileImage { get; set; } 2) In the Login.xaml.cs file, before the line where we redirect to the Home page if the login was successful. Create another WebClient request to fetch details from this url - .xml">http://api.twitter.com/1/users/show/<TwitterUsername>.xml I am interested only in the “profile_image_url” node in this xml string returned. You can choose what ever field you need – the reference to the Twitter API Documentation is here. 3) This particular url does not require any authentication so no need of network credentials for this and also the useDefaultCredentials will be true. So this code would look like. WebRequest.RegisterPrefix("http://", System.Net.Browser.WebRequestCreator.ClientHttp); WebClient myService = new WebClient(); myService.AllowReadStreamBuffering = myService.UseDefaultCredentials = true; myService.DownloadStringCompleted += new DownloadStringCompletedEventHandler(TimelineRequestCompleted_User);) myService.DownloadStringAsync(new Uri("http://api.twitter.com/1/users/show/" + TwitterUsername.Text + ".xml")); 4) To parse the xml file returned by this and get the value of the “profile_image_url” node, the LINQ code will look something like XDocument xdoc; xdoc = XDocument.Parse(e.Result); var answer = (from status in xdoc.Descendants("user") select status.Element("profile_image_url").Value); GlobalVariable.profileImage = answer.First().ToString(); 5) After this, we can then redirect to Home page completing our login formalities. 6) In the home page, add a image tag and give it a name, something like <Image Name="image1" Stretch="Fill" Margin="29,29,0,0" Height="73" VerticalAlignment="Top" HorizontalAlignment="Left" Width="73" /> 7) In the OnNavigated to event in home page, we can set the image source url as below image1.Source = new BitmapImage(new Uri(GlobalVariable.profileImage, UriKind.Absolute)); Hope this helps. If you have any queries / suggestions, please feel free to comment below or contact me. Technorati Tags: Silverlight,LINQ,Twitter API,Twitter

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  • Rendering trillions of "atoms" instead of polygons?

    - by Baring
    I just saw a video about what the publishers call the "next major step after the invention of 3D". According to the person speaking in it, they use a huge amount of atoms grouped into clouds instead of polygons, to reach a level of unlimited detail. They tried their best to make the video understandable for persons with no knowledge of any rendering techniques, and therefore or for other purposes left out all details of how their engine works. The level of detail in their video does look quite impressive to me. How is it possible to render scenes using custom atoms instead of polygons on current hardware? (Speed, memory-wise) If this is real, why has nobody else even thought about it so far? I'm, as an OpenGL developer, really baffled by this and would really like to hear what experts have to say. Therefore I also don't want this to look like a cheap advert and will include the link to the video only if requested, in the comments section.

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  • Sneak Peek: Reports In Visual Studio 2010, WPF & Silverlight

    The DevExpress Reports team has been busy preparing for the DXperience v2010.1 release. Im happy to report that theyre hard work has paid off and the new items for v2010.1 look fantastic: Complete Support for Visual Studio 2010 The XtraReports Suite now fully supports the new Microsoft IDE providing the same feature set as for the previous Visual Studio versions: Create new reports using templates available through the Add New Item dialog Use fully-integrated report designer with native...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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