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Posts Tagged ‘linq’

Last week we looked at the extension points Microsoft has wired into the LINQ to SQL classes and how they can be used to achieve some of the capabilities of the Business Logic Layer (BLL) in a multi-layered architecture.

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As promised a few days ago, I will be covering multi-layered architecture as it relates to LINQ.

The first thing we need to evaluate is how Microsoft intended multi-layered architecture to work.  I mean, if we want to know how to do this, the best place to start is with the people who created the technology in the first place, right?

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In order to understand how Microsoft intends LINQ to be used in a multi layered architecture, we first need to take a look at partial classes, which have been around since .NET 2.0, and the new partial methods.

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There is a new datasource control available in Visual Studio that works in much the same way as the SQLDataSource and the ObjectDataSource.  While I would argue that the LinqDataSource is better than the SqlDataSource, I’m not yet ready to say that it is better than the ObjectDataSource.  And, until I do a bit more experimenting with this new control, I’ll probably still use the ObjectDataSource.

However, there are some of you who are probably using the SqlDataSource who should probably move to the LinqDataSource ASAP.  Here’s the basics of how you use this new control.

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Today we finally put all the code we’ve been looking at for the last couple of weeks into practice and take a look at LINQ.  Today’s example will be relatively brief but once you understand the underlying parts, which we’ve covered already, there really isn’t much to actually using LINQ. Read the rest of this entry »

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