Tag Archives: c#

Duplicate Key Exception

Posted on October 17, 2013 by david

Entity Framework throws exceptions from the DbContext’s SaveChanges method if there is a constraint violation in the database. If you have a property marked as invariant w.r.t. concurrency, that too will raise an exception at this point (a DbUpdateConcurrencyException Exception. … Continue reading →

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SignalR

Posted on October 3, 2013 by david

Wow. I just looked at Signalr again… Just added the Git package to a web application, added the git package for the stock ticker example, fixed the bug on the stockticker html page that referenced the wrong version of the … Continue reading →

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Architecture : Entity Framework

Posted on May 6, 2013 by david

I’ve had an extensive opportunity to play with entity framework. Here are my few thoughts. Code first does work reasonably well if you are starting from scratch, but managing the release of vital enterprise applications, which require care around the DB become … Continue reading →

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RX Example

Posted on February 15, 2013 by david

Just an update to the doc with the Rx tutorial: Newer versions of Rx need a small change to the source code: Observable.FromEvent<EventArgs>(txt, “TextChanged”) Changes to Observable.FromEventPattern<EventArgs>(txt, “TextChanged”) And the references are: System.Reactive.Core System.Reactive.Interfaces System.Reactive.PlatformServices System.Reactive.Linq System.Reactive.Windows.Forms Rx is available on … Continue reading →

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Embedding a Python Interpreter in C# – Iron Python

Posted on February 15, 2013 by david

I needed to be able to execute scripts in two client applications. One was written in Java the other in C#. The script needs to manipulate classes in the language the interpreter in embedded in. This program works with IronPython … Continue reading →

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