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Data Points: Precompiling LINQ Queries

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

Did you know that by precompiling LINQ queries you might actually be degrading your app's performance if you're not careful? Julie Lerman explains how to ensure you're not re-precompiling queries each time and losing the expected performance benefits across post-backs, short-lived service operations and other code where critical instances are going out of scope.

Julie Lerman

MSDN Magazine March 2010

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Hi all

I'm not sure how to structure the code for this but what I want to do is be able to add data to a database, and once this has completed successfully, then email the user to say the details have been added successfully to the database.

I need to:

1. Check that the relevant data has been added into the database then

2. Email the details of the relevant data when completed. 


Thanks in advance for your help,




The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must



This is frustrating, and I don't know how to solve it.

I have a strange problem. I am adding a LinqDatasource object, and set the context:

        protected void LinqDataSource_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
            e.ObjectInstance = new KaruselaDataContext(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);

Then I get this error:
The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Linq, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089'.


On web.config I already have this:
<add assembly="System.Data.Linq, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

NOTE: The datacontext is in a different project (DLL proect) where I added a refernce to System.Data.Linq.

is there another way adding a refernce to a web project? or only though teh web.config?


Which tier do Linq queries belong?


Started in middle of a new project.  Our design architecture uses an n-tier (not MVC - no controllers) structure with Presentation, Data, Business and Service tiers.  However the lead analyst has the majoriety of code all in the Business tier claiming it all contains Business logic.  Our data tier is nothing more than a single .dbml model of the primary database to support all of the Linq queries in the Business tier.  To my mind Linq queries and classes they use are data access and belong in the data tier  but our lead analyst says they contain business logic therefore have to be in business layer.  

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