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Mirrored Weblogs
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This is a post relevant to all the developers out there that use Web Forms as their main ASP.Net platform. In this post I would like to talk about ViewState and how we can move it and store it in a session on the server's memory. We know that the default...( read more )...
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In my seminars I always show how to fetch data from an SQL Server database to some UI controls (usually a GridView control). I use the connected data access model,I use the disconnected data access model (datasets) and obviously I provide samples that...( read more )...
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In this post I would like to show you again with a hands-on example how to create an Ajax enabled WCF Service and invoke it using the Ajax Script Manager web server control. This is going to be a very simple example and it is for people who are not familiar...( read more )...
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Πήγα και εγώ χθες στην εφορία μου κι έλαβα τον κλειδάριθμο για να πιστοποιήσω το λογαριασμό που είχα από παλιότερα (στο παλιό TAXISnet) – έδωσε και νέο password όπως μου ζήτησε και μπήκα να δώ τι καλούδια έχει. Φαίνεται ενδιαφέρον (απ’ότι κατάλαβα πλέον τα βιβλία θα τα κρατάμε ΜΟΝΟ ηλεκτρονικά), αλλά έχει τα bug-άκια του [...]...
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LINQ is .NET Language-Integrated Query . It's included in .NET Framework 3.5 and you can use it in Visual Studio 2008 projects. XPO has officially supported LINQ since v7.3 and since then we have continued to improve and support it. Nowadays LINQ to XPO is very mature, extendable ( How to: Implement Custom Functions and Criteria in LINQ to XPO ) and powerful ( Free Joins ). In the latest version we make it even easier to use LINQ to XPO since we only distribute one assembly, DevExpress.XPO.dll, which includes everything! (custom providers as well). XPO can talk transparently to a large list of database systems . It was already possible to make complex queries using our standard criteria syntax , however using LINQ offers some great advantages. No magic strings, like you have in standard criteria syntax, Intellisense support making it easier and faster to construct your queries, Compile time checking, Learning to write LINQ queries/lambdas is a must learn for .NET developers, The benefits are clear, however there...
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In this post I would like to show you with a hands-on example how to invoke a WCF service from JQuery . I have already posted a few posts regarding JQuery and server communication.Have a look in this post and in this post . This is a similar post . In...( read more )...
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This is the second post in the new HTML 5 post series. You can find the first post about HTML 5 input form elements and validation here . In this post I would like to show you how to use audio and video.We all know that audio and video are everywhere...( read more )...
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Just a quick post to wish all of you out there in the community a very Merry Christmas and a Happy New Year! I thought I had better take some time out from all the usual revelry to thank you all for making our framework what it is right now. Now is the season of generosity and goodwill so it's a good time to reflect on what has been achieved at eXpand through the giving of ideas. Of course my biggest Christmas wish is that communication and collaboration between us all in the online community is increased a thousand times more! Let's all make a New Year's resolution to work together and take our framework to the roof! MERRY XMAS!...
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I am going to start a new series of posts that focus on HTML 5. HTML 5 is something I wanted to learn and finally I have covered enough ground to feel confident. HTML 5 gives us things like Semantic tags, the possibility to add video and audio in our...( read more )...
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While I was trying to visit twitter I suddenly was faced with this page, which although very well designed looked immediately suspicious to me, first of all because of the redirects I noticed happening at the address bar and also because the landing URL was using the word “rewardz”. Moreover the page seems to be [...]...
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I guess you know the classic pop song "Who’s That Girl" from Madonna: When I came across the following “You need to log in to read this article” page at NewScientist, I had a feeling of Déjà vu Indeed, it was the same hard to miss pretty face from the home page of a remote [...]...
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In one of my previous posts (appox. a year ago) I have demonstrated how to bind to IEnumerables in ASP.NET MVC. I have shown several ways of dynamically adding/removing elements from the list through the use of Javascript and then jQuery-templates. In that post I have used the traditional ASP.NET MVC literals <% %> and of course the whole site operated in HTML4 and jQuery. Today a lot of things have changed. From HTML4 we are moving to HTML5, we start using CSS3 for our styles, we use Razor for our views in ASP.NET MVC and we can take advantage of the knockoutjs library that has managed to bring the world of MVVM patterns closer to the world of Javascript and it did it with some impressive results. Therefore, in this post we are going to re-implement the same project adopting all those new (or not so new) great technologies. We need to implement a simple site where we have a list of clients with a first and last name and we need to give to our users the ability to manage that list (insert/remove/edit...
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If you type help IF at the Windows 7 command-line (can launch this by searching at Windows Start menu search box for “Command” or by typing cmd there and pressing ENTER), you get in one of the help pages printed out for the batch files’ IF command: %ERRORLEVEL% will expand into a string representation of [...]...
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At 11.00 PST on Thursday 15th December I will be appearing live on Scott Hanselman ’s podcast Hanselminutes . During the course of the show Scott and I will be discussing eXpand framework and its relationship with XAF . Please tune in and show some support for your favorite frameworks! We built this thing together guys and this is an exciting event for all of us....
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In these series of posts I am going to have a look into the various factors that make our web applications slower and how we can rectify that. Ι have already blogged about caching in this blog and you can find these blog posts below Caching an ASP.Net...( read more )...
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Believe in the community Last weekend I had a great time. That's thanks to ITPro|Dev Connections conference that took place in Glifada, Greece. It was my first Greek dev conferece as I have only a year and a half that I am back in my country. I never had the chance so far to take a closer look at the community and have a taste of the level and the experience of the developers. I have to admit that I was quite skeptical before going to the event. That's because of my disappointment from the interviews I have conducted for the company I work. There were people that have never heard the term "Design Patterns"!!! I won't get any deeper to the situation as there are many parts to blame and that is not the point of this post. Maybe I will write one in the future... What I want to point out though is that I have met some people that made me believe once again in the potential of my country. Because these people are GREAT programmers, great entrepreneurs and great minds! I would like to list them here (in alphabetical...
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There are various font collection sites where you can find nice typefaces you can preview and download: http://www.fonts2u.com/ http://www.ffonts.net/ http://www.fontxs.com/ http://www.abstractfonts.com/ http://www.fontspace.com/ http://www.dafont.com/ Make sure you check the license for each font you download before using it in some project (some are only free for personal use, others are free for commercial use too). [...]...
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Since the LvS desktop application (from Learning Via Subtitling project) uses Internet Explorer to embed Microsoft Office Word, Excel, PowerPoint and Adobe Acrobat PDF documents (among others), I added some useful info to the LvS download page on how to work around issues one may face in such a scenario: If you don’t have Microsoft [...]...
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500 Internal Server Error Λυπούμαστε, κάτι δεν πήγε καλά. Η διευθέτηση του ζητήματος έχει ανατεθεί σε μια άρτια εκπαιδευμένη ομάδα μαϊμούδων. If you see them, show them this information: IH6pYV6uW08aEw7RTmh2nctOCLKwYBoSQTT250UKk1Aq9OGTSu0MO16kB8kH IX8I1EZVDq2NHuva2SRpXGL6hG38xdffPCV3YBYJu8LVe1L9r7vz_fQrTavV aEsYIAILDGIATDB2OC78kZeqDUS9jeQzQqBiA6_Q7RDGkivkzT6XcaChvBAI TVWzwDPaNPJV8J7m2aqxgprbkCwzzcIfMD1toWoe4cbls7NqoBvCYAEsfZKD HlQ_3ylykRbFkJfi1HapcCFYJvnFB-6wyNYtgciyVuTEcieOHUq3-6zSAHk9 jzA1y2nndSZdSonvl5QTyCxWlrUzJR-ILxQuCmLI7iJgjl6r6rJCiR0G4ETR 4saaalM-MS2GGaikabqbENBLmtcerB5ZM37s-CgMgfbgxjTDb6__Te4_hveU H0mFIVTykRF3KkJKNTbKnXgzZ8l3OxU1KFiPL3Qsbnk5XADrMx1ThvgRWS-C wANkQ3C7EM0TDm0Xfwl4lVg2tE_eGmdktkmSzIpK3mnzZMUJ5TPhpchuoE_H kSIcV16f_p2phAfJsjbwKs11szwt_HLlEyeH1MUizpvNcrMh8qzDcd2H8siN mtkBjG0NrRjPyh2Cv8VIxfY__LpSJQ5J-V8t7ee9wFgmRrwL0MbzOopueiV_ SccnIpDai8vLFWAnAUr_AsNKKmHMd8BMEb2tiPinyoZUspbc1ad8cmn0_QUm EeXVbx0G3pSdnESz-5zD0gg2xCmtJg3xKIaYSF5rKAGS5nnDLoneX3D5SPoQ aIpRDo_-edF48zLYG5hmI2QSrUKiIuZreHmdw7YELfs5J6JJcWHDXfFTrHaY...
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I recently found a very nice article at CodeProject on Combinatorics algorithms implementation (specifically Permutations, Combinations and Variations with Repetition option) using C# Generics: http://www.codeproject.com/KB/recipes/Combinatorics.aspx It uses a lexicographic algorithm, so it allows one to ask for “next” permutation/combination/variation from the collection of all possible ones, in the spirit of C++ Standard Library’s (STL) “next_permutation” [...]...
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WF4 uses a service oriented architecture and as a result any problem can be decoupled into smaller, easily solvable and testable services. XAF uses MVC architecture which, in a sense, is very similar to that used by WF4. We can compare XAF’s controllers to WF4 services. Moreover XAF’s Application does the same job as the WF4 server. The upshot of all this is that users should be able to get the feel of WF4 in no time at all. The XAF workflow module introduces a new layer that makes the already decoupled services aware of our business classes. After this the sky is the limit and over the next few posts I aim to demonstrate some of what can be achieved. For example the next post will focus on creating an event driven workflow initialization engine. To get back to today’s post, we will discuss an implementation that is very decoupled and as a result it has very limited dependencies on other modules. It is worth noting that all XAF’s features are decoupled, persistent objects take on the role of domain mappers....
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This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here In this post I would like to show you how to perform client-side validations using the...( read more )...
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Ευχαριστούμε όλους εσάς που ήρθατε και μας τιμήσατε (την Ισαβέλλα και εμένα) στην παρουσίαση "HTML5 Real Live Conversations" στο πλαίσιο του σεμιναρίου ITProDevConnections 2011 . Στους παρακάτω συνδέσμους το υλικό της παρουσίασης (μέσα στην εβδομάδα...
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Just got bitten by the following: Dim takeN As Integer = If(Integer.TryParse(EdTake.Text, takeN), takeN, itemsCount) I had used that instead of writing in 2 lines: Dim takeN As Integer If not Integer.TryParse(EdTake.Text, takeN) then takeN = itemsCount However, there’s an important difference: “If” is a function, so its arguments are evaluated at call-time. The “If” [...]...
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This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here In this post I would like to show you how to create a simple watermark effect using...( read more )...
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