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Software ==>	Visual C# (55 exercises)
Topic ==>	LINQ with Entity Frameworks (4 exercises)
Level ==>	Average difficulty
Subject ==>	C# training

Use a LINQ statement to populate a grid of events (returning an anonymous type)

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file . Once you've done this:

Go into SQL Server Management Studio;
Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
Execute this script.

This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).

If you haven't already done so, go into SQL Server Management Studio and open the file in the above folder and run its script. This should generate a WorldEvents database. Create an ADO entity model based upon this database.

The method of creating an entity model is not given here, since it varies according to which version of Windows Forms, Visual Studio, LINQ to SQL Classes and Entity Frameworks you are using. If in doubt, ask your trainer!

Here is one version of the entity framework to show you which tables and fields you can reference:

The database contains four tables with relationships between them.

Create a form called frmEventsList containing a datagridview, and get this to show a list of events when you load the form (but see notes below for how to do this):

You should use an anonymous type to return a list of events, as shown below. See below for more on how to proceed!

To get this to work, write a LINQ statement which selects rows from the tblEvent table in ascending date order, and from this return an anonymous type containing the following fields:

Field	Notes
What	The event name
When	The event date
Country	The country name from the tblCountry table
Category	The category name from the tblCategory table

The entity model should include relationships brought in from the SQL Server database, so you shouldn't need to create any joins. To get the first 5 events, use Take.

When everything is working OK, you can close down your form!

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

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