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  • Adding a value to a 'datetime' column caused overflow.

    - by sathya
    Adding a value to a 'datetime' column caused overflow. Came across this error today. So thought of posting the same. Whenever you try to do a dateadd like this  dateadd(mm,12,datefield) you might face this error if the value in your records in the datefield is not a valid date or if u add some months or date to this value and the output of that will exceed the date range In my case i was just thinking what would be the error here. But unfortunately there was some data in the table which was there with the value (Ex:date of joining column) 1-1-9999 So my sql statement has tried to add 12 months to this and it had caused this error.

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  • Windows Installer Error Codes 2738 and 2739

    - by Wil Peck
    I recently encountered this error on my Vista x64 box and came across a post that provided ended up providing the resolution. Link to information about MSI script-based custom action error codes 2738 and 2739 On my system I went to the C:\Windows\SysWOW64 directory and re-registered vbscript.dll and jscript.dll.  Once I did this my WIX project built and I no longer received the 4 ICE offenses (ICE08, ICE09, ICE32 and ICE61).   Technorati Tags: WIX,Windows Installer

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  • Windows 2008 R2, UDDI 3.0 and No Admin Links

    - by Andy Morrison
    Windows 2008 R2 might end up giving me a heart attack at some point. Yesterday I installed and configured UDDI 3.0 as part of an ESB 2.0 install & config.  After configuring UDDI 3.0, if I browsed to the localhost/uddi virtual directory from IIS, all of the links would show up in UDDI.  If opened up IE and went to the UDDI site only the Home and Search links would show up. You've probably already guessed at what the "fix" was... I had to Run IE as Administrator.  Then when I browse to the UDDI site all of the links show up.

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  • Visual Tree Enumeration

    - by codingbloke
    I feel compelled to post this blog because I find I’m repeatedly posting this same code in silverlight and windows-phone-7 answers in Stackoverflow. One common task that we feel we need to do is burrow into the visual tree in a Silverlight or Windows Phone 7 application (actually more recently I found myself doing this in WPF as well).  This allows access to details that aren’t exposed directly by some controls.  A good example of this sort of requirement is found in the “Restoring exact scroll position of a listbox in Windows Phone 7”  question on stackoverflow.  This required that the scroll position of the scroll viewer internal to a listbox be accessed. A caveat One caveat here is that we should seriously challenge the need for this burrowing since it may indicate that there is a design problem.  Burrowing into the visual tree or indeed burrowing out to containing ancestors could represent significant coupling between module boundaries and that generally isn’t a good idea. Why isn’t this idea just not cast aside as a no-no?  Well the whole concept of a “Templated Control”, which are in extensive use in these applications, opens the coupling between the content of the visual tree and the internal code of a control.   For example, I can completely change the appearance and positioning of elements that make up a ComboBox.  The ComboBox control relies on specific template parts having set names of a specified type being present in my template.  Rightly or wrongly this does kind of give license to writing code that has similar coupling. Hasn’t this been done already? Yes it has.  There are number of blogs already out there with similar solutions.  In fact if you are using Silverlight toolkit the VisualTreeExtensions class already provides this feature.  However I prefer my specific code because of the simplicity principle I hold to.  Only write the minimum code necessary to give all the features needed.  In this case I add just two extension methods Ancestors and Descendents, note I don’t bother with “Get” or “Visual” prefixes.  Also I haven’t added Parent or Children methods nor additional “AndSelf” methods because all but Children is achievable with the addition of some other Linq methods.  I decided to give Descendents an additional overload for depth hence a depth of 1 is equivalent to Children but this overload is a little more flexible than simply Children. So here is the code:- VisualTreeEnumeration public static class VisualTreeEnumeration {     public static IEnumerable<DependencyObject> Descendents(this DependencyObject root, int depth)     {         int count = VisualTreeHelper.GetChildrenCount(root);         for (int i = 0; i < count; i++)         {             var child = VisualTreeHelper.GetChild(root, i);             yield return child;             if (depth > 0)             {                 foreach (var descendent in Descendents(child, --depth))                     yield return descendent;             }         }     }     public static IEnumerable<DependencyObject> Descendents(this DependencyObject root)     {         return Descendents(root, Int32.MaxValue);     }     public static IEnumerable<DependencyObject> Ancestors(this DependencyObject root)     {         DependencyObject current = VisualTreeHelper.GetParent(root);         while (current != null)         {             yield return current;             current = VisualTreeHelper.GetParent(current);         }     } }   Usage examples The following are some examples of how to combine the above extension methods with Linq to generate the other axis scenarios that tree traversal code might require. Missing Axis Scenarios var parent = control.Ancestors().Take(1).FirstOrDefault(); var children = control.Descendents(1); var previousSiblings = control.Ancestors().Take(1)     .SelectMany(p => p.Descendents(1).TakeWhile(c => c != control)); var followingSiblings = control.Ancestors().Take(1)     .SelectMany(p => p.Descendents(1).SkipWhile(c => c != control).Skip(1)); var ancestorsAndSelf = Enumerable.Repeat((DependencyObject)control, 1)     .Concat(control.Ancestors()); var descendentsAndSelf = Enumerable.Repeat((DependencyObject)control, 1)     .Concat(control.Descendents()); You might ask why I don’t just include these in the VisualTreeEnumerator.  I don’t on the principle of only including code that is actually needed.  If you find that one or more of the above  is needed in your code then go ahead and create additional methods.  One of the downsides to Extension methods is that they can make finding the method you actually want in intellisense harder. Here are some real world usage scenarios for these methods:- Real World Scenarios //Gets the internal scrollviewer of a ListBox ScrollViewer sv = someListBox.Descendents().OfType<ScrollViewer>().FirstOrDefault(); // Get all text boxes in current UserControl:- var textBoxes = this.Descendents().OfType<TextBox>(); // All UIElement direct children of the layout root grid:- var topLevelElements = LayoutRoot.Descendents(0).OfType<UIElement>(); // Find the containing `ListBoxItem` for a UIElement:- var container = elem.Ancestors().OfType<ListBoxItem>().FirstOrDefault(); // Seek a button with the name "PinkElephants" even if outside of the current Namescope:- var pinkElephantsButton = this.Descendents()     .OfType<Button>()     .FirstOrDefault(b => b.Name == "PinkElephants"); //Clear all checkboxes with the name "Selector" in a Treeview foreach (CheckBox checkBox in elem.Descendents()     .OfType<CheckBox>().Where(c => c.Name == "Selector")) {     checkBox.IsChecked = false; }   The last couple of examples above demonstrate a common requirement of finding controls that have a specific name.  FindName will often not find these controls because they exist in a different namescope. Hope you find this useful, if not I’m just glad to be able to link to this blog in future stackoverflow answers.

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  • The True Cost of a Solution

    - by D'Arcy Lussier
    I had a Twitter chat recently with someone suggesting Oracle and SQL Server were losing out to OSS (Open Source Software) in the enterprise due to their issues with scaling or being too generic (one size fits all). I challenged that a bit, as my experience with enterprise sized clients has been different – adverse to OSS but receptive to an established vendor. The response I got was: Found it easier to influence change by showing how X can’t solve our problems or X is extremely costly to scale. Money talks. I think this is definitely the right approach for anyone pitching an alternate or alien technology as part of a solution: identify the issue, identify the solution, then present pros and cons including a cost/benefit analysis. What can happen though is we get tunnel vision and don’t present a full view of the costs associated with a solution. An “Acura”te Example (I’m so clever…) This is my dream vehicle, a Crystal Black Pearl coloured Acura MDX with the SH-AWD package! We’re a family of 4 (5 if my daughters ever get their wish of adding a dog), and I’ve always wanted a luxury type of vehicle, so this is a perfect replacement in a few years when our Rav 4 has hit the 8 – 10 year mark. MSRP – $62,890 But as we all know, that’s not *really* the cost of the vehicle. There’s taxes and fees added on, there’s the extended warranty if I choose to purchase it, there’s the finance rate that needs to be factored in… MSRP –   $62,890 Taxes –      $7,546 Warranty - $2,500 SubTotal – $72,936 Finance Charge – $ 1094.04 Grand Total – $74,030 Well! Glad we did that exercise – we discovered an extra $11k added on to the MSRP! Well now we have our true price…or do we? Lifetime of the Vehicle I’m expecting to have this vehicle for 7 – 10 years. While the hard cost of the vehicle is known and dealt with, the costs to run and maintain the vehicle are on top of this. I did some research, and here’s what I’ve found: Fuel and Mileage Gas prices are high as it is for regular fuel, but getting into an MDX will require that I *only* purchase premium fuel, which comes at a premium price. I need to expect my bill at the pump to be higher. Comparing the MDX to my 2007 Rav4 also shows I’ll be gassing up more often. The Rav4 has a city MPG of 21, while the MDX plummets to 16! The MDX does have a bigger fuel tank though, so all in all the number of times I hit the pumps might even out. Still, I estimate I’ll be spending approximately $8000 – $10000 more on gas over a 10 year period than my current Rav4. Service Options Limited Although I have options with my Toyota here in Winnipeg (we have 4 Toyota dealerships), I do go to my original dealer for any service work. Still, I like the fact that I have options. However, there’s only one Acura dealership in all of Winnipeg! So if, for whatever reason, I’m not satisfied with the level of service I’m stuck. Non Warranty Service Work Also let’s not forget that there’s a bulk of work required every year that is *not* covered under warranty – oil changes, tire rotations, brake pads, etc. I expect I’ll need to get new tires at the 5 years mark as well, which can easily be $1200 – $1500 (I just paid $1000 for new tires for the Rav4 and we’re at the 5 year mark). Now these aren’t going to be *new* costs that I’m not used to from our existing vehicles, but they should still be factored in. I’d budget $500/year, or $5000 over the 10 years I’ll own the vehicle. Final Assessment So let’s re-assess the true cost of my dream MDX: MSRP                    $62,890 Taxes                       $7,546 Warranty                 $2,500 Finance Charge         $1094 Gas                        $10,000 Service Work            $5000 Grand Total           $89,030 So now I have a better idea of 10 year cost overall, and I’ve identified some concerns with local service availability. And there’s now much more to consider over the original $62,890 price tag. Tying This Back to Technology Solutions The process that we just went through is no different than what organizations do when considering implementing a new system, technology, or technology based solution, within their environments. It’s easy to tout the short term cost savings of particular product/platform/technology in a vacuum. But its when you consider the wider impact that the true cost comes into play. Let’s create a scenario: A company is not happy with its current data reporting suite. An employee suggests moving to an open source solution. The selling points are: - Because its open source its free - The organization would have access to the source code so they could alter it however they wished - It provided features not available with the current reporting suite At first this sounds great to the management and executive, but then they start asking some questions and uncover more information: - The OSS product is built on a technology not used anywhere within the organization - There are no vendors offering product support for the OSS product - The OSS product requires a specific server platform to operate on, one that’s not standard in the organization All of a sudden, the true cost of implementing this solution is starting to become clearer. The company might save money on licensing costs, but their training costs would increase significantly – developers would need to learn how to develop in the technology the OSS solution was built on, IT staff must learn how to set up and maintain a new server platform within their existing infrastructure, and if a problem was found there was no vendor to contact for support. The true cost of implementing a “free” OSS solution is actually spinning up a project to implement it within the organization – no small cost. And that’s just the short-term cost. Now the organization must ensure they maintain trained staff who can make changes to the OSS reporting solution and IT staff that will stay knowledgeable in the new server platform. If those skills are very niche, then higher labour costs could be incurred if those people are hard to find or if trained employees use that knowledge as leverage for higher pay. Maybe a vendor exists that will contract out support, but then there are those costs to consider as well. And let’s not forget end-user training – in our example, anyone that runs reports will need to be trained on how to use the new system. Here’s the Point We still tend to look at software in an “off the shelf” kind of way. It’s very easy to say “oh, this product is better than vendor x’s product – and its free because its OSS!” but the reality is that implementing any new technology within an organization has a cost regardless of the retail price of the product. Training, integration, support – these are real costs that impact an organization and span multiple departments. Whether you’re pitching an improved business process, a new system, or a new technology, you need to consider the bigger picture costs of implementation. What you define as success (in our example, having better reporting functionality) might not be what others define as success if implementing your solution causes them issues. A true enterprise solution needs to consider the entire enterprise.

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  • Welcome

    - by 13DaysaWeek
    Greetings! Let me start with an introduction.  My name is Chris House.  I'm a consultant with Digineer, a management and technology consultant firm in the Twin Cities of Minneapolis/St. Paul, Minnesota.  My particular area of focus is on middle tier technologies such as BizTalk, WCF, etc. I'm looking forward to sharing some of the interesting tidbits I come across during the course of my work.

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  • Just too bright

    - by Bunch
    Like a lot of folks I am using SSMS and VS pretty much all day. But staring at the text on the stark white background can be a bit much for my eyes after a while. I have seen quite a few different “themes” for these apps which change all the colors around to make it easier on your eyes. Some of them are pretty cool but all I really wanted was to dim the background a little not radically change the way everything looked. Since the stock colors for comments, breakpoints, keywords and the like are so familiar I wanted a background that did not interfere with those colors. So I picked the following custom color for the item background. It comes off as a parchment type color. Hue: 42        Red: 244 Sat: 123    Green: 245 Lum: 221    Blue: 224

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  • Silverlight Cream Top Posted Authors September, 2010 to February, 2011

    - by Dave Campbell
    It's a bit past the first of March, and it's now time to recognize devs that have a large number of posts in Silverlight Cream. Ground Rules I pick what posts are on the blog Only posts that go in the database are included The author has to appear in SC at least 4 of the 6 months considered I averaged the monthly posts and am only showing Authors with an average greater than 1. Here are the Top Posted Authors at Silverlight Cream for September 1, 2010 through February 28, 2011: It is my intention to post a new list sometime shortly after the 1st of every month to recognize the top posted in the previous 6 months, so next up is March 1! Some other metrics for Silverlight Cream: At the time of this posting there are 7672 articles aggregated and searchable by partial Author, partial Title, keywords (in the synopsis), or partial URL. There are also 118 tags by which the articles can be searched. This is an increase of 368 posts over last month. At the time of this posting there are 984 articles tagged wp7dev. This is an increase of 201 posts over last month, or 54% of the posts added. Stay in the 'Light!

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  • WCF HttpClient Error calling a RESTful WCF Service - Cannot write more bytes to the buffer than the configured maximum buffer size: 65536

    - by Justin Hoffman
    Using the HttpClient API from wcf.codeplex.com, you may encounter this error if respones are too large.   Cannot write more bytes to the buffer than the configured maximum buffer size: 65536 In order to increase the size of the Response Buffer, just increase the MaxReseponseContentBufferSize as shown below. Increase it to something larger than the default: 65536 depending on your response sizes. var client = new HttpClient { MaxResponseContentBufferSize = 196608, BaseAddress = new Uri("http://myservice/service1/") };

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  • WP7&ndash;Samsung Owners Should Hold Off on the Update

    - by D'Arcy Lussier
    Microsoft released an update for WP7 that’s meant to improve updating the devices going forward. They’ve identified a glitch though, specifically with Samsung phones. From Winrumors: A number of Windows Phone 7 users applied the patch on Monday and some Samsung Omnia owners devices have been left in a “bricked” state. Devices simply instruct users to connect them to a PC, hard resetting the device or connecting it to a PC does not appear to solve the issue. Microsoft has also been advising users with broken devices to return them to stores for exchange. The scary thing about this is the resolution: return the “broken” devices to stores for exchange. Many Samsung Focus owners in Canada purchased unlocked phones from the US, and supposedly that act alone voided the warranty. So applying the update has very dire implications for those who might be left with a very pretty brick. I’m going to wait until there are successful installs of the patched update before going ahead with it on my device.

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  • SO-Aware @ TechReady (Microsoft Event)

    - by SURESH GIRIRAJAN
    A session on SO-Aware is presented at Microsoft TechReady event this week check here for more details : http://tellagostudios.com/blog/so-aware-highlighted-microsoft-techready Check here for more details on SO-Aware and how to leverage within your enterprise if you’re using BizTalk Server, WCF Services and services build on Azure. It provides lot of capability such as: o    Centralized service repository o    Centralized configuration management o    Service testing o    Monitoring o    Transparent integration with technologies such as Visual Studio, BizTalk Server, Windows Server & Azure AppFabric among many others o    SO-Aware Test Workbench provides developers with a visually rich environment to model and control the execution of load and functional tests in a SOA infrastructure. This tool includes the first native WCF load testing engine allowing developers to transparently load test applications built on Microsoft's service oriented technologies such as WCF, BizTalk Server or the Windows Server or Azure AppFabric.

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  • TellagoStudio's presenting SOA Governance on the Microsoft platform using SO-Aware at Microsoft TechReady.

    - by Vishal
    Hi there, Microsoft is hosting the first edition of their annual TechReddy conference. TechReady is an internal Microsoft conference but Microsoft invited Tellago Studios to present a session about how to enable Agile SOA Governance on the Microsoft platform using our recently release product: SO-Aware. As part of our session, we will take a look at the current challenges that organizations face when enabling SOA governance capabilities on the Microsoft platform and how organizations can benefit from  more agile, lightweight and modern SOA governance models. The session will provide a practical view to the role of Tellago Studios' SO-Aware as an essential technology to enable native SOA governance on the Microsoft platform. We will explore in detail important capabilities of SO-Aware such as Centralized service repository Centralized configuration management Service testing Monitoring Transparent integration with technologies such as Visual Studio, BizTalk Server, Windows Server & Azure AppFabric among many others But the fun doesn't stop there..... As part of this session, we will showcase for the first time our upcoming SO-Aware Test Workbench product which enables load and functional web service testing capabilities on the Microsoft technology stack. SO-Aware Test Workbench provides developers with a visually rich environment to model and control the execution of load and functional tests in a SOA infrastructure. This tool includes the first native WCF load testing engine allowing developers to transparently load test applications built on Microsoft's service oriented technologies such as WCF, BizTalk Server or the Windows Server or Azure AppFabric.

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  • Playing with F#

    - by mroberts
    Project Euler is a awesome site.   When working with a new language it can be tricky to find problems that need solving, that are more complex than "Hello World" and simpler than a full blown application. Project Euler gives use just that, cool and thought provoking problems that usually don't take days to solve.  I've solved a number of questions with C# and some with Java.  BTW, I used Java because it had BigInteger support before .Net. A couple weeks ago, back when winter had a firm grip on Columbus, OH, I began playing (researching) with F#.  I began with Problem #1 from Project Euler.  I started by looking at my solution in C#. Here is my solution in C#. 1: using System; 2: using System.Collections.Generic; 3:   4: namespace Problem001 5: { 6: class Program 7: { 8: static void Main(string[] args) 9: { 10: List<int> values = new List<int>(); 11:   12: for (int i = 1; i < 1000; i++) 13: { 14: if (i % 3 == 0 || i % 5 == 0) 15: values.Add(i); 16: } 17: int total = 0; 18:   19: values.ForEach(v => total += v); 20:   21: Console.WriteLine(total); 22: Console.ReadKey(); 23: } 24: } 25: }   Now, after much tweaking and learning, here is my solution in F#.   1: open System 2:   3: let calc n = 4: [1..n] 5: |> List.map (fun x -> if (x % 3 = 0 || x % 5 = 0) then x else 0) 6: |> List.sum 7:   8: let main() = 9: calc 999 10: |> printfn "result = %d" 11: Console.ReadKey(true) |> ignore 12:   13: main() Just this little example highlights some cool things about F#. Type inference. F# infers the type of a value.  In the C# code above we declare a number of variables, the list, and a couple ints.  F# does not require this, it infers the calc (a function) accepts a int and returns a int. Great built in functionality for Lists.  List.map for example. BTW, I don’t think I’m spilling the beans by giving away the code for Problem 1.  It by far is the easiest question, IMHO, solved by 92,000+ people. Next I’ll look into writing a class library with F#.

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  • Backup SQL Database Federation

    - by Herve Roggero
    One of the amazing features of Windows Azure SQL Database is the ability to create federations in order to scale your cloud databases. However until now, there were very few options available to backup federated databases. In this post I will show you how Enzo Cloud Backup can help you backup, and restore your federated database easily. You can restore federated databases in SQL Database, or even on SQL Server (as regular databases). Generally speaking, you will need to perform the following steps to backup and restore the federations of a SQL Database: Backup the federation root Backup the federation members Restore the federation root Restore the federation members These actions can be automated using: the built-in scheduler of Enzo Cloud Backup, the command-line utilities, or the .NET Cloud Backup API provided, giving you complete control on how you want to perform your backup and restore operations. Backing up federations Let’s look at the tool to backup federations. You can explore your existing federations by using the Enzo Cloud Backup application as shown below. As you can see, the federation root and the various federations available are shown in separate tabs for convenience. You would first need to backup the federation root (unless you intend to restore the federation member on a local SQL Server database and you don’t need what’s in the federation root). The steps are similar than those to backup a federation member, so let’s proceed to backing up a federation member. You can click on a specific federation member to view the database details by clicking at the tab that contains your federation member. You can see the size currently consumed and a summary of its content at the bottom of the screen. If you right-click on a specific range, you can choose to backup the federation member. This brings up a window with the details of the federation member already filled out for you, including the value of the member that is used to select the federation member. Notice that the list of Federations includes “Federation Root”, which is what you need to select to backup the federation root (you can also do that directly from the root database tab).  Once you provide at least one backup destination, you can begin the backup operation.  From this window, you can also schedule this operation as a job and perform this operation entirely in the cloud. You can also “filter” the connection, so that only the specific member value is backed up (this will backup all the global tables, and only the records for which the distribution value is the one specified). You can repeat this operation for every federation member in your federation. Restoring Federations Once backed up, you can restore your federations easily. Select the backup device using the tool, then select Restore. The following window will appear. From here you can create a new root database. You can also view the backup properties, showing you exactly which federations will be created. Under the Federations tab, you can select how the federations will be created. I chose to recreate the federations and let the tool perform all the SPLIT operations necessary to recreate the same number of federation members. Other options include to create the first federation member only, or not to create the federation members at all. Once the root database has been restored and the federation members have been created, you can restore the federation members you previously backed up. The screen below shows you how to restore a backup of a federation member into a specific federation member (the details of the federation member are provided to make it easier to identify). Conclusion This post gave you an overview on how to backup and restore federation roots and federation members. The backup operations can be setup once, then scheduled daily.

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  • Good Customer Service Example

    - by MightyZot
    Here’s another good customer service example for you! My wife purchased a Galaxy last week and she loves the phone.  She asked me to add it to our AT&T Microcell last night. I purchased the AT&T Microcell a couple of years ago, because cell signal out where I live sucks! Since microcells are managed on the AT&T web site, I went to the site and tried to sign in. Naturally, having not managed that microcell in a couple of years…and much to my chagrin…I discovered that I didn’t know my password OR my user ID. So, I decided to call and see if I could get my account reset that late in the day (we’re talking last night, so it was well after 7pm.) I called the technical support line, touched the appropriate numbers to navigate to microcell support, turned on my speaker phone, and prepared for the long wait. After about 45 seconds I was delighted to hear “Jeffrey” break in and ask what he could help me with. I explained that I have not managed my microcell for some time and had forgotten the user name and password.  “No problem”, he replied, and he asked me for the line I used to register the microcell. After confirming the last four digits of my IMEI number, he asked me for my wife’s number. I gave him my wife’s number and he said, “I’ve taken care of it Mr Pope. Just have her reboot her phone and you should see your microcell.” We rebooted her phone, it connected to the microcell, and voila, she was online! “Is there anything else I can help you with while I’ve got you on the line”, he said. “Nope”, I replied. “Ok, have a great night.” What made this a great customer service experience for me was that “Jeffrey” didn’t stop at giving me my user account and password, which I would probably forget anyway after setting up my wife’s new phone. Instead, he solved the real problem for me – adding my wife’s new phone to my microcell. Great job Jeffrey!

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  • Windows Store now open to ALL developers

    - by CSharpZealot
    A little late, but it should be announced here too... Today’s an especially great day to be a developer. We’re very excited to announce the last significant milestone in the rollout of the Windows Store before the general availability of Windows 8 on October 26. The Store is now open for app submissions from all developers – individuals and companies – in our supported markets, and we’ve added 82 more app submission markets! Now, developers from 120 markets can publish Windows Store apps. Ted Dworkin, Partner Program Manager for the Store, authored this post. --Antoine Source: http://blogs.msdn.com/b/windowsstore/archive/2012/09/11/windows-store-now-open-to-all-developers.aspx About two weeks ago the Windows Store was opened and with the upcoming general availability of Windows 8 in October, it seems that it was good timing. In addition to the store being opened, Microsoft also announced that the MSDN, BizSpark and DreamSpark will get a 1-year Windows Store developer account. That's a different tact than what we saw for the Windows Phone 7, where we didn't get that subscription included. We're already seeing new apps showing up faster and faster, so with the addition of 86 more markets we're only going to see more apps than ever available. Since i'm now back on a Windows 8 platform (was out for about a month) I'm going to start blogging more content around the Windows 8 developer experience. Next stop for me...get my hands on a Windows 8 surface device as quickly as possible :) Keep coding!

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  • Computer Networks UNISA - Chap 8 &ndash; Wireless Networking

    - by MarkPearl
    After reading this section you should be able to Explain how nodes exchange wireless signals Identify potential obstacles to successful transmission and their repercussions, such as interference and reflection Understand WLAN architecture Specify the characteristics of popular WLAN transmission methods including 802.11 a/b/g/n Install and configure wireless access points and their clients Describe wireless MAN and WAN technologies, including 802.16 and satellite communications The Wireless Spectrum All wireless signals are carried through the air by electromagnetic waves. The wireless spectrum is a continuum of the electromagnetic waves used for data and voice communication. The wireless spectrum falls between 9KHZ and 300 GHZ. Characteristics of Wireless Transmission Antennas Each type of wireless service requires an antenna specifically designed for that service. The service’s specification determine the antenna’s power output, frequency, and radiation pattern. A directional antenna issues wireless signals along a single direction. An omnidirectional antenna issues and receives wireless signals with equal strength and clarity in all directions The geographical area that an antenna or wireless system can reach is known as its range Signal Propagation LOS (line of sight) uses the least amount of energy and results in the reception of the clearest possible signal. When there is an obstacle in the way, the signal may… pass through the object or be obsrobed by the object or may be subject to reflection, diffraction or scattering. Reflection – waves encounter an object and bounces off it. Diffraction – signal splits into secondary waves when it encounters an obstruction Scattering – is the diffusion or the reflection in multiple different directions of a signal Signal Degradation Fading occurs as a signal hits various objects. Because of fading, the strength of the signal that reaches the receiver is lower than the transmitted signal strength. The further a signal moves from its source, the weaker it gets (this is called attenuation) Signals are also affected by noise – the electromagnetic interference) Interference can distort and weaken a wireless signal in the same way that noise distorts and weakens a wired signal. Frequency Ranges Older wireless devices used the 2.4 GHZ band to send and receive signals. This had 11 communication channels that are unlicensed. Newer wireless devices can also use the 5 GHZ band which has 24 unlicensed bands Narrowband, Broadband, and Spread Spectrum Signals Narrowband – a transmitter concentrates the signal energy at a single frequency or in a very small range of frequencies Broadband – uses a relatively wide band of the wireless spectrum and offers higher throughputs than narrowband technologies The use of multiple frequencies to transmit a signal is known as spread-spectrum technology. In other words a signal never stays continuously within one frequency range during its transmission. One specific implementation of spread spectrum is FHSS (frequency hoping spread spectrum). Another type is known as DSS (direct sequence spread spectrum) Fixed vs. Mobile Each type of wireless communication falls into one of two categories Fixed – the location of the transmitted and receiver do not move (results in energy saved because weaker signal strength is possible with directional antennas) Mobile – the location can change WLAN (Wireless LAN) Architecture There are two main types of arrangements Adhoc – data is sent directly between devices – good for small local devices Infrastructure mode – a wireless access point is placed centrally, that all devices connect with 802.11 WLANs The most popular wireless standards used on contemporary LANs are those developed by IEEE’s 802.11 committee. Over the years several distinct standards related to wireless networking have been released. Four of the best known standards are also referred to as Wi-Fi. They are…. 802.11b 802.11a 802.11g 802.11n These four standards share many characteristics. i.e. All 4 use half duplex signalling Follow the same access method Access Method 802.11 standards specify the use of CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) to access a shared medium. Using CSMA/CA before a station begins to send data on an 802.11 network, it checks for existing wireless transmissions. If the source node detects no transmission activity on the network, it waits a brief period of time and then sends its transmission. If the source does detect activity, it waits a brief period of time before checking again. The destination node receives the transmission and, after verifying its accuracy, issues an acknowledgement (ACT) packet to the source. If the source receives the ACK it assumes the transmission was successful, – if it does not receive an ACK it assumes the transmission failed and sends it again. Association Two types of scanning… Active – station transmits a special frame, known as a prove, on all available channels within its frequency range. When an access point finds the probe frame, it issues a probe response. Passive – wireless station listens on all channels within its frequency range for a special signal, known as a beacon frame, issued from an access point – the beacon frame contains information necessary to connect to the point. Re-association occurs when a mobile user moves out of one access point’s range and into the range of another. Frames Read page 378 – 381 about frames and specific 802.11 protocols Bluetooth Networks Sony Ericson originally invented the Bluetooth technology in the early 1990s. In 1998 other manufacturers joined Ericsson in the Special Interest Group (SIG) whose aim was to refine and standardize the technology. Bluetooth was designed to be used on small networks composed of personal communications devices. It has become popular wireless technology for communicating among cellular telephones, phone headsets, etc. Wireless WANs and Internet Access Refer to pages 396 – 402 of the textbook for details.

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  • Parallel MSBuild FTW - Build faster in parallel

    - by deadlydog
    Hey everyone, I just discovered this great post yesterday that shows how to have msbuild build projects in parallel Basically all you need to do is pass the switches “/m:[NumOfCPUsToUse] /p:BuildInParallel=true” into MSBuild. Example to use 4 cores/processes (If you just pass in “/m” it will use all CPU cores): MSBuild /m:4 /p:BuildInParallel=true "C:\dev\Client.sln" Obviously this trick will only be useful on PCs with multi-core CPUs (which we should all have by now) and solutions with multiple projects; So there’s no point using it for solutions that only contain one project.  Also, testing shows that using multiple processes does not speed up Team Foundation Database deployments either in case you’re curious Also, I found that if I didn’t explicitly use “/p:BuildInParallel=true” I would get many build errors (even though the MSDN documentation says that it is true by default). The poster boasts compile time improvements up to 59%, but the performance boost you see will vary depending on the solution and its project dependencies.  I tested with building a solution at my office, and here are my results (runs are in seconds): # of Processes 1st Run 2nd Run 3rd Run Avg Performance 1 192 195 200 195.67 100% 2 155 156 156 155.67 79.56% 4 146 149 146 147.00 75.13% 8 136 136 138 136.67 69.85%   So I updated all of our build scripts to build using 2 cores (~20% speed boost), since that gives us the biggest bang for our buck on our solution without bogging down a machine, and developers may sometimes compile more than 1 solution at a time.  I’ve put the any-PC-safe batch script code at the bottom of this post. The poster also has a follow-up post showing how to add a button and keyboard shortcut to the Visual Studio IDE to have VS build in parallel as well (so you don’t have to use a build script); if you do this make sure you use the .Net 4.0 MSBuild, not the 3.5 one that he shows in the screenshot.  While this did work for me, I found it left an MSBuild.exe process always hanging around afterwards for some reason, so watch out (batch file doesn’t have this problem though).  Also, you do get build output, but it may not be the same that you’re used to, and it doesn’t say “Build succeeded” in the status bar when completed, so I chose to not make this my default Visual Studio build option, but you may still want to. Happy building! ------------------------------------------------------------------------------------- :: Calculate how many Processes to use to do the build. SET NumberOfProcessesToUseForBuild=1  SET BuildInParallel=false if %NUMBER_OF_PROCESSORS% GTR 2 (                 SET NumberOfProcessesToUseForBuild=2                 SET BuildInParallel=true ) MSBuild /maxcpucount:%NumberOfProcessesToUseForBuild% /p:BuildInParallel=%BuildInParallel% "C:\dev\Client.sln"

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  • Ranking - Part II

    - by PointsToShare
    © 2011 By: Dov Trietsch. All rights reserved   Ranking Part II In my introduction to ranking I also introduced the Ranking Game. This is actually a much more sophisticated program than the one we need to simply rate an item, but it introduced you to the sophisticated results that you may achieve by a bit of code and accompanying CSS. In this installment, I am going to handle simple rating with 5 stars. The extra sophistication will come in the form of creating new elements in run time. Why do I need this? I like to be able to extend the SharePoint New and Update forms and put the starts in them simply by using the code shown here. We do not even need to go into SPD. We may achieve this simply by adding a content editor web part; more about this in the next installment. I have created a new page – Rank the Author – in which you may praise me in 5 different ways, but not immediately. The ranking mechanism – the 5 stars – has to be created first. To achieve that, click the “Add Element” button on the screen and then proceed in giving me the appropriate number of stars. Now view the source and see how this extra 5 start element was added. Also see how the ranking is achieved. This, obviously, is not any different in principle than what we did in the Ranking game. We create some sophisticated HTML, Add some style and create the element by: var divString = "<div id="rateMe" title="Rate Me...">    <a onclick="rateIt(this)" id="_1" title="ehh..." onmouseover="rating(this)" onmouseout="off(this)"></a>    <a onclick="rateIt(this)" id="_2" title="So So" onmouseover="rating(this)" onmouseout="off(this)"></a>    <a onclick="rateIt(this)" id="_3" title="Passable" onmouseover="rating(this)" onmouseout="off(this)"></a>    <a onclick="rateIt(this)" id="_4" title="Not too Bad" onmouseover="rating(this)" onmouseout="off(this)"></a>    <a onclick="rateIt(this)" id="_5" title="Not Bad" onmouseover="rating(this)" onmouseout="off(this)"></a></div>";m = document.createElement("p");m.innerHTML = divString;m.className = "blah";function AddElement(){    y = document.getElementById("Rest");    y.parentNode.insertBefore(m, y);} When you look into the full code, you’ll notice that I have added an empty <div id=”Rest”> into the form. A div element, like p, creates a line break, but the main purpose here was to mark the place above which I wanted to add the stars. Now you may hover over the stars, see how they behave and click on one of them to see that the program can react to your selection. That’s all folks!

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  • The provider did not return a ProviderManifestToken string Entity Framework

    - by PearlFactory
    Moved from Home to work and went to fire up my project and after long pause "The provider did not return a ProviderManifestToken string" or even More Abscure ProviderIncompatable Exception Now after 20 mins of chasing my tail re different ver of EntityFramework 4.1 vs 4.2...blahblahblah Look inside at the inner exception A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible DOH!!!! Or a clean translation is that it cant find SQL or is offline or not running. SO check the power is on/Service running or as in my case Edit web.config & change back to Work SQL box   Hope you dont have this pain as the default errors @ the moment suck balls in the EntityFramework 4.XX releases   Cheers

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  • NDepend 4.0 Released

    - by Anthony Trudeau
    Last week version 4.0 of NDepend was released.  NDepend is a Visual Studio add-in designed for intense code analysis with the goal of high quality code.  A month ago I wrapped up my evaluation of the previous version of NDepend. The new version contains many minor changes, several bug fixes, and adds about 50 new code rules.  The version also adds support for Visual Studio 11, .NET Framework 4.5, and SilverLight 5.0.  But, the biggest change was the shift from CQL to CQLinq. Introducing CQLinq The latest version replaces the CQL rules language with CQLinq (CQL is still an option although the editor is buried).  As you might guess CQLinq is a flavor of Linq designed specifically for the code rules. The best way to illustrate the differences is with an example.  I used the following CQL example in Part 3 of my review: WARN IF Count > 0 IN SELECT TYPES WHERE IsInterface AND !NameLike “I” This same query looks like this when implemented in CQLinq: warnif count > 0 from t in Types where t.IsInterface == true && !t.NameLike(“I”) select t I like the syntax and it is a natural fit, but I found writing the queries frustrating in the Queries and Rules Edit window.  The Queries and Rules Edit window replaces the CQL Query Edit window.  The new editor has the same style of Intellisense as the previous editor.  However, it has a few annoyances.  The error indicator is a red block.  It has the tendency of obscuring your cursor.  Additionally, writing CQLing queries is like writing plain old Linq queries, so the fact that the editor uses Enter to select from Intellisense instead of Tab is jarring.  These issues can be an obstacle to writing queries quickly.CQLinq makes it possible to write rules that weren't possible before.  Additionally, a JustMyCode domain is now possible making it easy to eliminate generated code from the analysis.Should you Buy? I recommend NDepend overall.  It has some rough points for me that I have detailed in my earlier evaluation (starting here).  But, it’s definitely worth the money.  The bigger question is: should I pay for the upgrade to 4.0?  At this point I’m on the fence, but I would go for it if you need support for Visual Studio 2011, .NET Framework 4.5, or Silverlight 5.0; or if you need one of the many rules that weren't possible before CQLinq. Disclaimer: Patrick Smacchia contacted me about reviewing NDepend. I received a free license in return for sharing my experiences and talking about the capabilities of the add-in on this site. There is no expectation of a positive review elicited from the author of NDepend. Resources: NDepend Release Notes

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  • Why is my laptop so sluggish? Or Damn You Facebook and Twitter! Or All Hail Chrome!

    - by John Conwell
    In the past three weeks, I've noticed that my laptop (dual core 2.1GHz, 2Gb RAM) has become amazingly sluggish.  I only uses for communications and data lookup workflows, so the slowness was tolerable.  But today I finally got fed up with the suckyness and decided to get to the root of the problem (I do have strong performance roots after all). It actually didn't take all that long to figure it out.  About a year ago I converted to Google Chrome (away from FireFox).  One of the great tools Chrome has is a "Task Manager" tool, that gives you Windows Task Manager like details for all the tabs open in the browser (Shift + Esc).  Since every tab runs in its own process, its easy from Task Manager (both Windows or Chrome) to identify and kill a single performance offending tab.  This is unlike IE, where you only get aggregate data about all tabs open.  Anyway, I digress.  Today my laptop sucked.  Windows Task Manager told me that I had two memory hogging Chrome tabs, but couldn't tell me which web page those tabs are showing.  Enter Chrome Task Manager which tells you the page title, along with CPU, memory and network utilization of each tab.  Enter my amazement.  Turns out Facebook was using just shy of half a Gb of RAM.  Half a Gigabyte!  That's 512 Megabytes!524,288 Kilobytes! 536,870,912 Bytes!  Or 4,294,967,296 Bits!  In other words, that's a frackin boat load of memory.  Now consider that Facebook is running on pretty much 96.3% (statistics based on absolutely nothing) of every house hold desktop, laptop, netbook, and mobile device in America, that is pretty horrific! And I wasn't playing any Facebook games like FarmWars or MafiaVille.  I just had my normal, default home page up showing me who just had breakfast, or just got finished with their morning run. I'm sorry...let me say that again...HALF A GIG OF RAM!  That is just unforgivable. I can just see my mom calling me up:  Mom: "John...I think I need a new computer.  Mine is really slow these days" John: "What do you have running?" Mom: "Oh, just Facebook" John: "Ok, close Facebook and tell me how fast your computer feels" Mom: "Well...I don't know how fast it is.  All I do is use Facebook" John: "Ok Mom, I'll send you a new computer by Tuesday" Oh yea...and the other offending web page?  It was Twitter, using a quarter of a Gigabyte. God I love social networks!

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  • Microsoft Tag Tagged Me

    - by Brian Schroer
    I got EXTREMELY lucky last week and won an HP Mini 311 notebook from a Microsoft Tag Twitter contest. I did my required tweet to enter last Tuesday, and one hour later received notification that I had won the weekly drawing. Apparently you can tweet up to 500 times (I pity the followers of those who do that), so it was really lucky that I won, and I sympathize with those who had been really trying. If you would like to try your luck, there are seven weekly prizes left, and you can find out about the contest here: http://tag.microsoft.com/ttcontest.aspx For a free PC, I thought it was the least I could do to find out what Microsoft Tag is. I was vaguely aware of those pastel-y triangle-y square things that look like someone put one of Don Johnson’s Miami Vice outfits through a shredder, and knew that the company I work for (one of the world’s largest consumer products companies) was looking into putting them on our products, packaging and advertising, but didn’t know much more about the technology. I thought they were just an improvement over bar codes, and would be used in retail store scanners, but I was mistaken. These tags are meant to be scanned by consumers using their mobile phones, to get instant access to information, websites, reviews, etc. Scanning a tag can open a web page, import a contact card, or dial a phone number, play a video… Tag reader software can be installed on Windows Mobile, iPhone, Symbian, Blackberry, Android, J2ME, and other phones (and I suspect that it will be available for Windows Phone 7 also :). There are built-in tracking, metrics and analysis tools, to help companies using Tag make decisions about their marketing expenditures. (And they don’t have to look Miami Vice-y – They can be customized to reflect the personality of the person or a brand.) Looks like interesting stuff. You can find out more at http://tag.microsoft.com.

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  • Mohsen Agsen on C++

    - by raccoon_tim
    As I already blogged a while back, native code has been on the lips of many since TechEd 2011. Microsoft seems very committed to actually putting the language to use again after all these years of radio silence. Regarding this I urge you all guys to watch this video interview of Mohsen Agsen about C++ Today and Tomorrow http://channel9.msdn.com/Shows/Going+Deep/Mohsen-Agsen-C-Today-and-Tomorrow on Channel 9. What I find very inspiring about this interview is that Microsoft has a number of internal projects where they are using C++ and they really understand the value of C++ as a highly performant programming language. He also talks about combining managed code, scripted code and native code to get the most out of each of them. This is something that we are doing a lot in the game industry, since we recognize the need for performant platform code with an easy to write scripting layer on top of that. This is something I intend to blog about in the near future, so stay tuned! Another great thing that I bumped into recently is C++ AMP that was announced at this year’s AMD Fusion Developer Summit. I would recommend watching Herb Sutter’s keynote on the subject at http://channel9.msdn.com/posts/AFDS-Keynote-Herb-Sutter-Heterogeneous-Computing-and-C-AMP.

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