Omar AL Zabir blog on ASP.NET Ajax and .NET 3.5

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Chief Architect, SaaS Platform, British Telecom

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Building High Performance Queue in Database for storing Orders, Notifications, Tasks
We have Queues everywhere. There are queues for asynchronously sending notifications like email and SMS in most websites. E-Commerce sites have queues for storing orders, processing and dispatching them. Factory Assembly line automation systems have queues...
Posted: Sep 19 2010, 02:04 PM by oazabir | with no comments
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Finally! Entity Framework working in fully disconnected N-tier web app
Entity Framework was supposed to solve the problem of Linq to SQL, which requires endless hacks to make it work in n-tier world. Not only did Entity Framework solve none of the L2S problems, but also it made it even more difficult to use and hack it for...
Posted: May 18 2010, 10:31 AM by oazabir | with no comments
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Do not use “using” in WCF Client
You know that any IDisposable object must be disposed using using . So, you have been using using to wrap WCF service’s ChannelFactory and Clients like this: using (var client = new SomeClient()) { . . . } Or, if you are doing it the hard and slow way...
Posted: May 14 2010, 12:38 AM by oazabir | with no comments
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Unit Testing and Integration Testing in real projects
I am yet to find a proper sample on how to do realistic Test Driven Development (TDD) and how to write proper unit tests for complex business applications, that gives you enough confidence to stop doing manual tests anymore. Generally the samples show...
Simple way to cache objects and collections for greater performance and scalability
Caching of frequently used data greatly increases the scalability of your application since you can avoid repeated queries on database, file system or to webservices. When objects are cached, it can be retrieved from the cache which is lot faster and...
Posted: Nov 01 2009, 10:43 PM by oazabir | with 2 comment(s)
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Memory Leak with delegates and workflow foundation
Recently after Load Testing my open source project Dropthings , I encountered a lot of memory leak. I found lots of Workflow Instances and Linq Entities were left in memory and never collected. After profiling the web application using .NET Memory Profiler...
Posted: Mar 14 2009, 04:37 PM by oazabir | with 5 comment(s)
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Linq to Sql solve transaction deadlock and query timeout problems using uncommitted reads
When your database tables start accumulating thousands of rows and many users start working on the same table concurrently, SELECT queries on the tables start producing lock contentions and transaction deadlocks. This is a common problem in any high volume...
Strongly typed workflow input and output arguments
When you run a Workflow using Workflow Foundation, you pass arguments to the workflow in a Dictionary form where the type of Dictionary is Dictionary<string, object> . This means you miss the strong typing features of .NET languages. You have to...
Solving common problems with Compiled Queries in Linq to Sql for high demand ASP.NET websites
If you are using Linq to SQL, instead of writing regular Linq Queries, you should be using Compiled Queries . if you are building an ASP.NET web application that’s going to get thousands of hits per hour, the execution overhead of Linq queries is going...
Posted: Oct 28 2008, 02:24 AM by oazabir | with 15 comment(s)
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Desktop RSS Feed Aggregator client with Outlook Integration
Back in 2005, I built an open source RSS Feed Aggregator Desktop client which has been quite popular since its release. It has 48,672 downloads so far. From the activity I see on sourceforge statistics, it's being used about 20,000 times per day. http...
Posted: Feb 05 2008, 07:10 PM by oazabir | with no comments
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