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  • Silverlight TV with Myself, John Papa, Shawn Wildermuth and Ward Bell

    - by dwahlin
    I had the chance to go on a live episode of Channel 9 while at DevConnections and had a lot of fun chatting about various Silverlight topics and answering some fairly unique questions posted on Twitter.  Here’s more info on the episode from John Papa’s blog: John interviews a panel of 3 well known Silverlight leaders including Shawn Wildermuth, Dan Wahlin, and Ward Bell at the Silverlight 4 launch event. The guest panel answers questions sent in from Twitter about the features in Silverlight 4, thoughts on MVVM, and the panel members' experiences developing Silverlight. This is a great chance to hear from some of the leading Silverlight minds. These guys are all experts at building business applications with Silverlight. Relevant links: John's Blog and on Twitter (@john_papa) Shawn's Blog and on Twitter (@shawnwildermuth) Dan's Blog and on Twitter (@danwahlin) Ward's Blog and on Twitter (@wardbell) Silverlight Training Course on Channel 9 Follow us on Twitter @SilverlightTV or on the web at http://silverlight.tv You can see the episode online by clicking the image below:

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  • GlassFish Community Event and Party at JavaOne 2011 - Oct 2, 2011

    - by arungupta
    As in the previous years (2010, 2009, 2008 (more), and 2007), the GlassFish community event and party are getting planned along with JavaOne 2011 as well. Here are the coordinates for the community event: Date: Sunday, October 2nd, 2011 Time: 12:30pm - 4:30pm Venue: Moscone West The party will be held at the regular venue of The Thirsty Bear. This is your chance to meet the core members of engineering, product management, executive management, and rest of the team. This is your (yet another) chance to voice your opinion and be heard. There will be community updates, customer testimonials, unconference, and fun activities too. Stay tuned for more details. Here are some pictures from the yesteryears: A conference badge will be required to attend the community event but the party will be open to all friends of GlassFish. So if you are in town, plan to stop by at the community event and/or the party. Stay tuned for RSVP details. Its going to be lot of fun!

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  • GlassFish Community Event and Party at JavaOne 2011 - Oct 2, 2011

    - by arungupta
    As in the previous years (2010, 2009, 2008 (more), and 2007), the GlassFish community event and party are getting planned along with JavaOne 2011 as well. Here are the coordinates for the community event: Date: Sunday, October 2nd, 2011 Time: 12:30pm - 4:30pm Venue: Moscone West The party will be held at the regular venue of The Thirsty Bear. This is your chance to meet the core members of engineering, product management, executive management, and rest of the team. This is your (yet another) chance to voice your opinion and be heard. There will be community updates, customer testimonials, unconference, and fun activities too. Stay tuned for more details. Here are some pictures from the yesteryears: A conference badge will be required to attend the community event but the party will be open to all friends of GlassFish. So if you are in town, plan to stop by at the community event and/or the party. Stay tuned for RSVP details. Its going to be lot of fun!

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  • Windows Embedded Compact 7 and Silverlight for Windows Embedded

    - by Valter Minute
    If you want to see a preview of Windows Embedded Compact 7 you can attend a one-day workshop in Milan on the 7th of February. During the workshop you’ll have a chance to use the new tools and see the OS image running on a ARMv7 device. You can register here for the event (registration may already be overbooked, but if you register you’ll notified of other events in your area): http://www.arroweurope.com/it/news-events/arrow-events/dettaglio/article/microsoft-embedded-windows-ce-products-seminar-compact-7-1.html If you want to discover the potential of Silverlight for Windows Embedded running on CE 6.0 R3 or Windows Embedded Compact 7 you can attend a one day workshop at the Microsoft Innovation Center in Tourin on the 14th of February. In a full-day event you’ll be able to learn the theory and use the tools in practice, getting a good overview of this technology and a chance to experiment with the tools. You can register here: https://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032473933&Culture=it-IT

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  • Can a Guy with Embedded System Background go into Game Development

    - by NANDAGOPAL
    Well, I finished my Masters in Embedded Systems, and I am working in GUI development, and working with graphic tools and images and GUI's keep me glued to my seat more than working on code for MUP/MUC . And I want to give game development a Fair chance, try out developing a game from scratch using basic libraries then tryout the same in a free/open source game engine and there is a good chance I may fall in love with it, but it is poissible for a person with an Electrical and Electronics Bachelors and Embedded Systems Masters ( just a years experience in the field) go into game development and be successful in the profession. And I asked the same question @ stackoverflow.com (wrong place to ask ) http://stackoverflow.com/questions/13794822/can-a-guy-with-embedded-system-background-go-into-game-development/13794943#13794943 And I received good but a very generic answer. I would be happy to know the actual pro's and con's of a master's in embedded systems migrating to Game Dev

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  • can a guy with embedded system background go into game development

    - by NANDAGOPAL
    Well, I finished my Masters in Embedded Systems, and I am working in GUI development, and working with graphic tools and images and GUI's keep me glued to my seat more than working on code for MUP/MUC . And I want to give game development a Fair chance, try out developing a game from scratch using basic libraries then tryout the same in a free/open source game engine and there is a good chance I may fall in love with it, but it is poissible for a person with an Electrical and Electronics Bachelors and Embedded Systems Masters ( just a years experience in the field) go into game development and be successful in the profession. And I asked the same question @ stackoverflow.com (wrong place to ask ) http://stackoverflow.com/questions/13794822/can-a-guy-with-embedded-system-background-go-into-game-development/13794943#13794943 And I received good but a very generic answer. I would be happy to know the actual pro's and con's of a master's in embedded systems migrating to Game Dev And I am extremely sorry for asking the same question for the third time but I really did not know that stackoverflow had so many sister sites, So a really big sorry, and an even bigger thank you!

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  • Oracle India: Become an Oracle Student Ambassador

    - by user769227
     As the new year begins in India for many students, Oracle India is currently looking for bright, energetic students who are interested in becoming Oracle Campus Ambassadors. We have a dedicated team of Campus Recruiters who are regularly on site at selected Engineering Colleges in India - we need your help to spread the Oracle message within the Student Community. This is a great chance to work with one of the global leaders in the IT space and get some exposure to Oracle that many people do not get the chance to experience We are specifically looking for Campus Ambassadors at these colleges:   IIT Kanpur IIT Delhi  IIT  Madras  IIT Kharagpur  IIT Kharagpur  IIT Bombay  IIT Guwahati  IT-BHU  BITS Pilani  BITS Goa  IISc Bangalore  Do you want to find out more? Have a read of the Infographic we have created below that will talk a little about what an 'Oracle Ambassador' actually will do. If you are interested in this fantastic opportunity and meet the eligibility criteria send us your resume at [email protected] We are excited for another great school and we are looking forward to sharing that experience with you.

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  • Remmina 1.0 problems

    - by kamil
    I downloaded, compiled remmina and freerdp from the source repositories. Unlikely I am having troubles in RDP connections. When I initiate any RDP connection from Remmina, Remmina is closed immidialtely. I tried to open freerdp from terminal, it worked like a charm. I tried to open remmina from terminal to check errors. It says: segmentation fault - after connecting to any rdp connection I got the source from git: git clone git://github.com/FreeRDP/Remmina.git git clone git://github.com/FreeRDP/FreeRDP.git// Compilation is successfull with all dependencies. I tried to remove old remmina 0.9.9.1 with no chance I tried to reboot my machine and issue ldconfig with no chance I switched to other rdp clients right now. How can I be able to fix this? the old remmina was working well with RDP but causing sometimes high memory consumption (about 1GB of RAM) I am using Ubuntu 12.04.1 64bit

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  • Architecture Forum in the North 2010 - Hosted by Black Marble

    - by Stuart Brierley
    On Thursday the 8th of December I attended the "Architecture Forum in the North 2010" hosted by Black Marble. The third time this annual event has been held, it was pitched as featuring Black Marble and Microsoft UK architecture experts focusing on “Tools and Methods for Architects.... a unique opportunity to provide IT Managers, IT and software architects from Northern businesses the chance to learn about the latest technologies and best practices from Microsoft in the field of Architecture....insightful information about the latest techniques, demonstrating how with Microsoft’s architecture tools and technologies you can address your current business needs." Following a useful overview of the Architecture features of Visual Studio 2010, the rest of the day was given over to various features and ways to make use of Microsoft's Azure offerings.  While I did feel that a wider spread of technologies could have been covered (maybe a bit of Sharepoint or BizTalk even), the technological and architectural overviews of the Azure platform were well presented, informative and useful. The day was well organised and all those involved were friendly and approachable for questions and discussions.  If you are in "the North" and get a chance to attend next year I would highly recommend it.

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  • This not having job, is driving me nuts!

    - by Ratman21
    I had two jobs lined up (temporary but, hey they pay), one of which was in IT. A very low paying IT job for only 30 hours a week and only 3 weeks. At a large high tech company and a government (a not in my field job) temporary, paying a bit more, for little longer and for up to 40 hours a week. I was going to happily work my little self raged for the next 3 weeks. Guess what, the IT job fell thru and I now feel so let down. This I felt was my chance to get back in to IT, even if it was only for few weeks and maybe get note-us as hard working IT guy. I still have the other job but, let me add that there is no chance that it will turn in to something longer (I have been told that point blank). As I said this is nuts.

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  • Turn based battle and formula

    - by Mark Chapman
    I'm building a game called DVP(Digimon Virtual Pet), and in this game other than taking care of your digimon, You can also battle and breed them. I'm working on the battle system (making it first cause the actual pet system will be easy compared to the netplay, or 39DLL)but here is the problem I don't want it to be "too" simple or "too" complicated, but I do want to go by a certain formula. There are str, def, spd, and int. Strength: How hard the attacking digimon is hitting Defense: How much damage your digimon can defend when being attacked Speed: The chance of you missing the enemy Intelligence (battle knowledge): The chance of you hitting a critical hit or defending a critical hit. I can make a super simple turn based example, but I don't know how exactly to make the formulas for what I've explained above, any help?

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  • Missed the Call for Papers Deadline? Don't Despair!

    - by [email protected]
    Now, You've Got a Second Chance You were skiing in the Alps. Your dog ate your paper. You were locked in a time capsule that opened March 22 (one day after the Call for Papers deadline). No matter what your reason was for missing the deadline, you can still have a say in what's covered at Oracle OpenWorld 2010 and Oracle Develop 2010. We've just brought back the Suggest a Session program. And that means you've got a second chance to suggest presentations for Oracle OpenWorld and Oracle Develop 2010 and to share your ideas, experiences, and accomplishments with Oracle customers, developers, and partners. So hang up your skis and show us what you've got. The deadline for submission is June 20. Get all the information on the Suggest a Session process, timeline, and guidelines.

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  • Extremely Hybrid Game requirements

    - by tugrul büyükisik
    What system specifications would a game need if it was: Total players per planet: ~20000 Total players per team:~1M Total players per map(small volume of space or small surface over a planet): ~2000 Total players: ~10M(world has more players than this amount i think) Two of the players are commanders of opposite quadrants(from HUD of a strategy game). Lots of players use space-crafts as a captain(like 3d fps and rts). Many many players control consoles in those space-crafts as under command of captains.(fps ) Some players are still in stone-age trying to reinvent wheel in some planet. Players design and construct any vehicles they have. With good physics engine Has puzzles inside. Everyone get experience by doing stuff(RPG). Commerce, income or totally different resource-based group(like starcraft) Player classes(primitive: cunning and strong, wrapped: healthy, wealthy) Arcade top-down style firing with ships when people get bored very low chance of miraculous things.(mediclorians, wormholes, bugs) Different game-modes: persistent(living world), resetted periodically(a new chance for noobs), instant(pre-built space + hack&slash) I suspect this would need 128GB ram and 2048 cores.

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  • New Features, Fresh Competitive Edge: Help Your Customers Get the Most from Oracle RightNow Cloud Service by Sandi Main

    - by Tuula Fai
    Are your customers taking full advantage of their customer service solution? If they’re not up-to-speed with the new features of Oracle RightNow Cloud Service, this is their chance to catch up—and gain competitive advantage. Invite customers to join our live Webcast on Thursday, July 16, for a rapid overview of Oracle RightNow Cloud Service's most powerful new capabilities and what they mean for their organization. They’ll learn how they can: Take full advantage of RightNow's evolution under Oracle Stay ahead of the competition with key innovations and enhancements Upgrade with confidence based on other user experiences Don't miss the chance to help your customers deliver an even smarter customer experience.  Click here for the Evite to send to your customers.

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  • What is the difference between being an IT in investment bank and a professional IT company?

    - by deepsky
    Suppose there are two positions: IT in investment bank: developer for the infrastructure or the platform a famous IT company: embedded developer, linux As far as I understand, since in the investment bank not everyone will have the chance to work for the core trading system, most people just do the same job as they do in a normal IT company. And some of the tasks can even be outsourced. But in a professional IT company, you will have more chance to practice your coding skill and enhance your professional knowledge. So there are many choices when you want to change your job while the IT in invest bank not. Is this correct?

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  • What is "top new free" on GooglePlay

    - by Lumis
    On Android Market i.e. GooglePlay, there used to be a page with the latest new games. So every game had a chance to get noticed and make its way up especially if it was good. But now I see "top new free" page and no more the latest apps. I don't understand how can be "top new" Anybody knows how this works? If there are no more pages with the very latest uploaded games then the new apps will be barely seen to exist even if they are excellent, and new programmers have very little chance of getting noticed. Any good advice how to promote a new Android app these days?

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  • WP7: play MP3 using Media with phonegap/Cordova

    - by Loda
    My problem: I use the Media Class from Cordova. The MP3 file is only played once (the first time). Code: Add this code to the Cordova Starter project to reproduce my problem: var playCounter = 0; function playMP3(){ console.log("playMP3() counter " + playCounter); var my_media = new Media("app/www/test.mp3");//ressource buildAction == content my_media.play(); playCounter++; } [...] <p onclick="playMP3();">Click to Play MP3</p> VS output: [...] GapBrowser_Navigated :: /app/www/index.html 'UI Task' (Managed): Loaded 'System.ServiceModel.Web.dll' 'UI Task' (Managed): Loaded 'System.ServiceModel.dll' Log:"onDeviceReady. You should see this message in Visual Studio's output window." 'UI Task' (Managed): Loaded 'Microsoft.Xna.Framework.dll' Log:"playMP3() counter 0" 'UI Task' (Managed): Loaded 'System.SR.dll' Log:"media on status :: {\"id\": \"fa123123-bc55-a266-f447-8881bd32e2aa\", \"msg\": 1, \"value\": 1}" A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll Log:"media on status :: {\"id\": \"fa123123-bc55-a266-f447-8881bd32e2aa\", \"msg\": 1, \"value\": 2}" Log:"media on status :: {\"id\": \"fa123123-bc55-a266-f447-8881bd32e2aa\", \"msg\": 2, \"value\": 2.141}" Log:"media on status :: {\"id\": \"fa123123-bc55-a266-f447-8881bd32e2aa\", \"msg\": 1, \"value\": 4}" Log:"playMP3() counter 1" A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll A first chance exception of type 'System.IO.IOException' occurred in mscorlib.dll A first chance exception of type 'System.IO.IsolatedStorage.IsolatedStorageException' occurred in mscorlib.dll Log:"media on status :: {\"id\": \"2de3388c-bbb6-d896-9e27-660f1402bc2a\", \"msg\": 9, \"value\": 5}" My Config: cordova-1.6.1.js Lumia 800 WP 7.5 (7.10.7740.16) WorkAround (kind of): Desactivate the app (turn off the screen) reactivate the app (turn on the screen) - you get one more shot. Any help is welcome as I am blocked on this since may days and I found no usefull information anywhere. Also, Can you tell me if this code work on your config ? . . . Update: add a demo code using a global var. Keeping the instance alive. result The test2.mp3 is played and can replay fine. the test.mp3 is not played at all. It is the first file you play that will work. Code function onDeviceReady() { document.getElementById("welcomeMsg").innerHTML += "Cordova is ready! version=" + window.device.cordova; console.log("onDeviceReady. You should see this message in Visual Studio's output window."); my_media = new Media("app/www/test.mp3");//ressource buildAction == content my_media2 = new Media("app/www/test2.mp3");//ressource buildAction == content } var playCounter = 0; var my_media = null; function playMP3(){ console.log("playMP3() counter " + playCounter); my_media.play(); playCounter++; } var my_media2 = null; function playMP32(){ console.log("playMP32() counter " + playCounter); my_media2.play(); playCounter++; } </script> [...] <p onclick="playMP3();">Click to Play MP3</p> <p onclick="playMP32();">Click to Play MP3 2</p> VS output: Log:"onDeviceReady. You should see this message in Visual Studio's output window." INFO: startPlayingAudio could not find mediaPlayer for 71888b14-86fe-4769-95c9-a9bb05d5555b Log:"playMP32() counter 0" INFO: startPlayingAudio could not find mediaPlayer for 71888b14-86fe-4769-95c9-a9bb05d5555b Log:"playMP32() counter 1" Log:"playMP3() counter 2" INFO: startPlayingAudio could not find mediaPlayer for b60fa266-d105-a295-a5be-fa2c6b824bc1 A first chance exception of type 'System.ArgumentException' occurred in System.Windows.dll Error: El parámetro es incorrecto. Log:"playMP32() counter 3" INFO: startPlayingAudio could not find mediaPlayer for 71888b14-86fe-4769-95c9-a9bb05d5555b Can anybody reproduce this ? link to bug report: https://issues.apache.org/jira/browse/CB-941

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  • You Are Hiring But Do Candidate&rsquo;s Want to Work For You

    - by david.talamelli
    So here you are – it has happened, you are now interviewing for that position that you have either applied for or maybe were called about. Whether you are an “active” candidate looking for a job or a “passive” candidate who was contacted about the opportunity, it doesn’t matter now. Regardless of the circumstances of how you got to the interview stage, how you and your new potential manager connect with each other at interview will play a part in whether you are successful in landing that job. The best manager/employee relationships I think tend to be the ones where both the manager and employee have a common goal that they are both working towards and they work together in unison to achieve these goals. Candidates – when you are interviewing for a role, remember that an interview is a two way process. An interview shouldn’t be just a case of a company interviewing you to see if you are a good fit for a certain role. Don’t forget in an interview process it is equally important that you take the opportunity to similarly interview the company to see if that role/company are the right place for you to move to as the next step in your career. I think an interview should not only be a chance for a Hiring Manager to get to better know a candidate and asses his capability and cultural fit for a team/company but it should also be a chance for the candidate to similarly assess a company or manager about whether they are someone that they want to work with. Managers – I know Recruiters have been talking about the “war for talent” since before many of you were managers, but there is no denying it – it exists. You are not only competing with other companies for talented individuals but you are also competing with the existing companies that those talented individuals are working at. Companies are not going to let the people they have identified as superstars resign without a fight (this is the classic Counter Offer scenario which may be another blog post in itself). So how do we get these great people – their current employer will do all they can to keep them, everyone else wants them – does this mean all hope is lost? No, absolutely not. The same reasons that have always existed on why candidates are interested in other opportunities is still there: it could be that someone is looking for career advancement, or they want the chance to work with new technology or maybe you have an opportunity that is exactly what that person is looking to do. As a Hiring Manager don’t just conduct your interviews in question/answer mode. You should talk to that individual to work out what it is they are looking for and you can then relate how your role addresses that. It is potentially going to be the two of you working together so you two are the ones who have to be most comfortable with each other. Don’t oversell the role – set realistic expectations of what that candidate can expect working in your team – give them the good, the bad and the ugly so they can make an informed decision. Manager’s think back to when you last were looking for a job and put yourself in the candidate’s shoes. When you were looking for a job, what was it that you wanted to know about Oracle, or what was it that you wanted more information about. There are some great Business Leaders that work here at Oracle – if you are one of them it is likely that you already are doing all these things anyway. The good news for you is that you are also likely raising yourself head and shoulders above what many interviewers do – that in itself gives you a competitive advantage in this ‘war for talent’ but as a great Business Leader you already know that

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  • Meet our Interns: Adam and Hanadi

    - by Maria Sandu
    Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 This week, we’d like to introduce you to two of our ECEMEA Interns, Adam and Hanadi. They’re based in different countries and are part of different teams; however they both have the same enthusiasm in being an Intern at Oracle. “Hi! I’m Adam (Bachelor of Accounting Science & CIMA Diploma in Management Accounting), a member of the Oracle Applications Pre-sales team in Johannesburg, South Africa. Joining Oracle has been a truly inspiring experience thus far. My first week at Oracle has been one of insight and learning. I have had the opportunity to meet and interact with industry leading software solution professionals. Gaining insight into a mammoth multinational company has changed my perception on how things work and has truly opened my eyes to the world of business. Having the privilege of joining the Oracle Graduate Program has afforded me the chance to take advantage of countless training opportunities as well as the chance to learn about Information Technology in a practical manner which is vital to most businesses in today’s modern environment.” “Hi! I’m Hanadi, an Oracle 2013 Sales Intern from Saudi Arabia. I received my BSc in Information Technology from King Saud University and immediately after graduating I applied for the internship at Oracle. I thought it was an incredible opportunity and a great way to shift from college life to career life through learning and practicing in an environment with such high standards. At the beginning, I was a bit nervous in joining the serious business world, but once I joined, I found the program very organized and everyone was extremely helpful, which made it easier for us, as interns, to learn faster. If you are a self-motivated, committed person, who has initiative, accepts challenges, has good soft skills and some technical experience, I would definitely advice you to take a chance and apply for the program once you graduate. Best of luck!” Get the latest updates from the ECEMEA Sales and Presales Internship Programme 2013 by following #Oracleinterns on Twitter or visiting CampusatOracle Facebook Page! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-family:"Calibri","sans-serif"; mso-ascii- mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi- mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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  • Why is XmlSerializer throwing an InvalidOperationException?

    - by qster
    public void Save() { XmlSerializer Serializer = new XmlSerializer(typeof(DatabaseInformation)); /* A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll A first chance exception of type 'System.InvalidOperationException' occurred in System.Xml.dll */ // .... } This is the whole class if you need it: public class DatabaseInformation { /* Create new database */ public DatabaseInformation(string name) { mName = name; NeedsSaving = true; mFieldsInfo = new List<DatabaseField>(); } /* Read from file */ public static DatabaseInformation DeserializeFromFile(string xml_file_path) { XmlSerializer Serializer = new XmlSerializer(typeof(DatabaseInformation)); TextReader r = new StreamReader(xml_file_path); DatabaseInformation ret = (DatabaseInformation)Serializer.Deserialize(r); r.Close(); ret.NeedsSaving = false; return ret; } /* Save */ public void Save() { XmlSerializer Serializer = new XmlSerializer(typeof(DatabaseInformation)); if (!mNeedsSaving) return; TextWriter w = new StreamWriter(Path.Combine(Program.MainView.CommonDirectory.Get(), Name + ".xml"), false); Serializer.Serialize(w, this); w.Close(); NeedsSaving = false; } private string mName; public string Name { get { return mName; } } private bool mNeedsSaving; public bool NeedsSaving { get { return mNeedsSaving; } set { mNeedsSaving = value; Program.MainView.UpdateTitle(value); } } private bool mHasId; public bool HasId { get { return mHasId; } } List<DatabaseField> mFieldsInfo; }

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  • WPF binding fails with custom add and remove accessors for INotifyPropertyChanged.PropertyChanged

    - by emddudley
    I have a scenario which is causing strange behavior with WPF data binding and INotifyPropertyChanged. I want a private member of the data binding source to handle the INotifyPropertyChanged.PropertyChanged event. I get some exceptions which haven't helped me debug, even when I have "Enable .NET Framework source stepping" checked in Visual Studio's options: A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll A first chance exception of type 'System.InvalidOperationException' occurred in PresentationCore.dll Here's the source code: XAML <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="TestApplication.MainWindow" DataContext="{Binding RelativeSource={RelativeSource Self}}" Height="100" Width="100"> <StackPanel> <CheckBox IsChecked="{Binding Path=CheckboxIsChecked}" Content="A" /> <CheckBox IsChecked="{Binding Path=CheckboxIsChecked}" Content="B" /> </StackPanel> </Window> Normal implementation works public partial class MainWindow : Window, INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public bool CheckboxIsChecked { get { return this.mCheckboxIsChecked; } set { this.mCheckboxIsChecked = value; PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs("CheckboxIsChecked")); } } private bool mCheckboxIsChecked = false; public MainWindow() { InitializeComponent(); } } Desired implementation doesn't work public partial class MainWindow : Window, INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged { add { lock (this.mHandler) { this.mHandler.PropertyChanged += value; } } remove { lock (this.mHandler) { this.mHandler.PropertyChanged -= value; } } } public bool CheckboxIsChecked { get { return this.mHandler.CheckboxIsChecked; } set { this.mHandler.CheckboxIsChecked = value; } } private HandlesPropertyChangeEvents mHandler = new HandlesPropertyChangeEvents(); public MainWindow() { InitializeComponent(); } public class HandlesPropertyChangeEvents : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public bool CheckboxIsChecked { get { return this.mCheckboxIsChecked; } set { this.mCheckboxIsChecked = value; PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs("CheckboxIsChecked")); } } private bool mCheckboxIsChecked = false; } }

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