DotNetKicks.com : Stories kicked by ranw

Programmer's Backdoor Trap - Ran Wahle's blog

Tue, 31 Jan 2012 10:27:42 GMT

Today I've encountered something that made a programmer happy but made me sad. He had to pull data out of Data Warehouse and use it for his system. Later, he was informed that DWH personnel made his life easy: They've decided to write the data into his own database so he wouldn't have to work so hard. Unfortunately this news made him happy, and therefore he went on with it, which made me even sadder.

async \ await and Exception Handling

Thu, 12 Jan 2012 10:02:50 GMT

async \ await and Exception Handlingasync \ await and Exception Handling this post will discuss how async / await is handling exceptions. as we mention in previous post, about the async / await concept, await is all about continuation. before .NET 4.5 parallel execution exceptions has to be handle in separate of the synchronic handling. for example: handling ThreadPool execution:Code Snippetvoid Foo(){try {Console.WriteLine("Synchronic");ThreadPool.QueueUserWorkItem(state => {try ...

KnockoutJS-Dependencies - Ran Wahle's blog

Tue, 06 Dec 2011 20:32:34 GMT

After binding the data into our page, we wish to be able to create an interactive page. This means that we want to be able to add some behavior to our view-model, triggered by an event on the page. (A button being clicked for example).

KnockoutJS-Event binding - Ran Wahle's blog

Tue, 06 Dec 2011 20:32:34 GMT

KnockoutJS-Templates - Ran Wahle's blog

Fri, 02 Dec 2011 02:10:21 GMT

After being introduced KnockoutJs concept and go to know the basics of data-binding with Observable and observableArray, let's move on to how to work with templates and our collection to them. In this post I'll explain how to bind a collection with template.

KnockoutJS-The Observables - Ran Wahle's blog

Thu, 24 Nov 2011 10:56:57 GMT

On this post I'll dive, not deeply, to the javascript on our view-model and explain some of it's basics, the ones that causes it to act as a real view-model.

KnockoutJs-MVVM in HTML

Sun, 20 Nov 2011 14:49:43 GMT

One of the things I've cherished the most about XAML related technologies development was the ability to completely decouple behavior and UI using MVVM. I didn't know about any possibility to implement the same pattern on HTML & Javascript based applications.

Your service generates odd WSDL? Search for Serializable attribute

Sat, 12 Nov 2011 03:27:16 GMT

A problem I've encountered at a customer I work for was very strange behavior regarding the WSDL being generated by it's service. The WSDL didn't contain any class property, moreover it did contain private members of a class being exposed by the service.

Handling application states on Windows 8

Fri, 16 Sep 2011 04:39:07 GMT

As heard on BuildWindows and over and over again throughout the sessions there is new application state called Suspended. When using the computer in Metro style mode the application changes state to "suspended" when the user moves to another application. This is mainly for power saving since Windows 8 targeted to portable devices such as tablets.

Internet Explorer 8 (and below) won't show some of your jpegs

Thu, 01 Sep 2011 11:13:08 GMT

A very strange phenomenon I came across while developing web application for a customer. A Jpeg formatted picture wasn't shown on IE8 browsers, while shown on others (Firefox 5, Chrome 12, IE9). The browser displayed an empty placeholder with a red 'X' as it does when not finding an image. This led as to searching for causes such as wrong URL, communication problems etc. .

Changing namespace in ASP.NET Web-Form - Ran Wahle's blog

Thu, 04 Aug 2011 12:24:56 GMT

When converting VS Web-Site to VS Web application One of the problem you might stumble upon is class name collisions. It is due to the fact that web-site, because of it's compilation mode, can have the same class name (and no namespace) on different files because they will end up in different assemblies.

Code snippet for session wrapped properties

Thu, 04 Aug 2011 09:44:47 GMT

Long ago, I've written about session manager class which provides type safety while accession Session variables. One of it's foundations is the very properties we write that wraps the session variables. These properties tends to be very much alike and therefore I've written a code snippet for them.

Using session manager class in Global.asax - Ran Wahle's blog

Mon, 21 Mar 2011 12:04:42 GMT

Long ago, I've written about Session Manager class. The class purpose was to wrap session variables in properties and gain type safety to them. In this class we've added a Session property with get accessor, which wraps the HttpContext.Current.Session. Everything went well until I've encountered the need to use this class on Session_End method in global.asax

ETW-Reading events - Ran Wahle's blog

Thu, 03 Mar 2011 08:47:42 GMT

On my previous post I've shown how to consume ETW data using Data collector sets. What we've done there was setting the grounds for heaving a .etl file with the data we are going to read.

MVVM Using commands

Thu, 03 Mar 2011 08:33:16 GMT

On my previous post I've talked about MVVM in general. I've also demonstrated how data binding with ViewModel works. There is, however, issue with buttons: Buttons won't cause property changes (like TextBox, ComboBox etc. where you can have TwoWay binding mode) and therefor we cannot cause the ViewModel to run code through property setters.

404.2 and , ISAPI restriction and Web Service Extension - Ran Wahle's

Thu, 03 Mar 2011 07:19:13 GMT

A common and very misleading http error is the status with code 404.2 . It is misleading because it belongs to the 404 family which may indicate that the resource was not found, however this error indicates that the server has blocked our request by it's lockdown policy.

Convert Visual studio Web site to VS Web Application project - Ran Wah

Wed, 23 Feb 2011 13:29:09 GMT

At the customer I work for there are several applications written as a web site instead of Asp.Net web application project In this post I'm going to demonstrate, in a few steps, hoe to successfully convert VS-Web Site to VS-Web Application Project.

ETW - Consuming events - Ran Wahle's blog

Sun, 20 Feb 2011 00:06:22 GMT

You may or may not have heard about ETW which is a powerful tool for event tracing, which one of it's most significant advantages is it's performance . At this post I will demonstrate how to consume an event written by an application writes this events. I will do so by creating Data Collector Set .

Configure your ASP.NET application that uses routing in IIS-6 - Ran Wa

Tue, 11 Jan 2011 07:24:07 GMT

After coding our routing handler in our ASP.NET application (available in .NET 3.5 and in much easier way in .NET 4) Since IIS-6 doesn't use .Net as a natural part of it's pipeline there is a need to do some configuration.

Navigation in MVVM - Ran Wahle's blog

Sat, 27 Nov 2010 21:03:33 GMT

One of the main issues regarding Silverlight was the navigation issue, what commonly refers as "How can we support browser's back button". Although Microsoft has standard solution for that is somewhat limited. It's limitation concerns two main issues: 1. Navigation requires as to use Page Navigation and not user controls 2. It won't support scenario when pressing a link changes the internal state but will replace the entire page instead. In this post, I'll demonstrate how we can overcome these issues.

Ran Wahle's blog

Sat, 06 Nov 2010 17:28:22 GMT

On non-MVVM scenario we will simply create an EventHandler on our code-behind and attach it to our Click event . However, now we want to keep our code-behind as clean as possible. In this post, I'll demonstrate how to do so, using the button's Commnand property.

MVVM for Silverlight - what is it about? - Ran Wahle's blog

Tue, 02 Nov 2010 23:59:36 GMT

I recently had the pleasure of having Elad Katz as a consultant for the customer SilverLight I work for on Sela's behalf. Elad's job was to lead us migrating a "regular" Silverlight project to MVVM . This post is the first in a series discussing MVVM and it's application in Silverlight. In here I'll discuss about what MVVM is all about and what are it's advantages.

Casting operators - Ran Wahle's blog

Wed, 17 Mar 2010 04:57:18 GMT

Many times we've encountered the need to cast a variable from one type to another. On many occasions we couldn't and therefore had to write our own conversion methods. Many of these occasions the conversion methods involved our own classes. In this post I will demonstrate the casting operators that will allow as to have an implicit or explicit conversions between our types.

Deployment using Marge Module

Sun, 14 Mar 2010 08:27:24 GMT

Let's say you have an application that is consists of multiple assemblies (Isn't it the case most of the time?) . Deploying the application by one setup project is a common scenario and most of the time it will suit you best. But what happens where more than one assembly is independent and has to perform some installation logic?

Bi-directional Dictionary implementation - Ran Wahle's blog

Wed, 06 Jan 2010 06:32:48 GMT

There were several times, during my short development career, that I've used Dictionary<TKey, TValue>. It may not be on most cases, but I'm sure in many of them, I needed to find a dictionary item by it's value whereas the dictionary's values were unique as well as it's keys. This led me to the motivation of developing a dictionary that will support bi-directional access.