c# barcode generator free Lesson 2: LINQ and ADO.NET in C#.NET

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Lesson 2: LINQ and ADO.NET
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ChAPTER 11
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Sample of C# Code protected void ButtonShowTitles_Click(object sender, EventArgs e) { using (PubsEntityModel.PubsEntities pubs = new PubsEntityModel.PubsEntities()) { var titleQuery = from t in pubs.Titles where t.PublisherId == DropDownListPublishers.SelectedValue orderby t.TitleName select t; GridViewTitles.DataSource = titleQuery; GridViewTitles.DataBind(); } }
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Run the application and view the results.
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Lesson Summary
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You can use LINQ to DataSet to write queries against in-memory representations of data tables. You use the DataAdapter object to fill a DataSet with data. You can then use the DataTable.Tables method and DataTable.Field method to reference the table and column you want to use in your query. You can also fill a strongly typed DataSet object and thus write queries against strongly typed object collections instead of just DataRow collections. LINQ to SQL allows you to define an O/R map as a DBML file that creates objects to represent your database tables. You can then write LINQ queries against these objects as well as insert, update, and delete data in the database. You can create an Entity Data Model (EDMX file) to work with LINQ to Entities. This model includes an application model, a database schema, and a map to keep the two in sync. You can then write LINQ queries against the application model objects without concerning yourself with the ADO.NET code.
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680 ChAPTER 11
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Connecting to and Querying Data with LINQ
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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 2, LINQ and ADO.NET. The questions are also available on the companion CD in a practice test, if you prefer to review them in electronic form.
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Note
AnsWERs
Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.
You need to write a where clause in a LINQ query against a strongly typed DataSet of universities (from u in universities). The where clause should select all universities with more than 10,000 enrolled students. Which where clause would you write
A. where u.Field("EnrolledStudents") > 10000 B. where u.EnrolledStudents > 10000 c. C#: where u[ EnrolledStudents ] > 10000 visual basic: where u( EnrolledStudents ) > 10000 D. where university.Fields.EnrolledStudents > 10000
2. 3.
Which of the following objects represents a LINQ to SQL O/R map
A. DataSet B. XElement c. ObjectContext D. DataContext
You are using an Entity Data Model object. Which of the following lines of code will initialize this object and connect to the associated database (Choose all that apply.)
A. MyModel.myEntities model = new MyModel.myEntitites() B. MyModel.myEntities model = new MyModel.myEntitites(cnnString) c. PubsModel.pubsEntities pubs = new PubsModel.pubsEntities(
new System.Data.EntityClient.EntityConnection(cnnString))
D. MyModel.myEntities model = new MyModel.myEntitites(
new DataContext(cnnString))
Lesson 2: LINQ and ADO.NET
ChAPTER 11
Case scenarios
In the following case scenarios, you apply what you ve learned in this chapter. If you have difficulty completing this work, review the material in this chapter before beginning the next chapter. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario 1: Writing LINQ Queries
You are a developer working for the School of Fine Art. You have been asked to write a new application for working with high school transcripts of incoming freshman. Many of these transcripts are available from a central high school reporting XML web service. Others have been sent to the university as XML files to be placed into a standard directory using a standard format. You have been asked to write a few reports that use this data. One report classifies incoming freshman according to their high school grade point average. Another report identifies new students based on high school size. Thinking about how you will write these queries, answer the following questions:
1. 2.
What will you use to combine the results of both data sources How will you write your queries
Case Scenario 2: Working with LINQ and ADO.NET
You are a developer working for Contoso, Ltd., a propane supplier. The company includes multiple subsidiaries that came about by acquisition. Each subsidiary has similar data. However, each database technology and schema is different. You have been asked to write a new application that each subsidiary will install to run its business. However, too much is tied to each subsidiary s database schema. Therefore, the individual databases will not be re-written. Thinking about how you will write this application, answer the following question.
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