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Answers
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B. Incorrect. Synchronizing with an XML document and performing the XPath query on the raw XML is not correct. C. Correct. Passing the XPath query as a string to the DocumentElement.SelectNodes method is the correct way to execute an XPath query against a DataSet. D. Incorrect. Passing the XPath query as a string to the DataTable.Find method is not correct.
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Lesson 6
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1. Correct Answers: C and D A. Incorrect. The DataColumn in the DataTable is not the correct way to access individual values in a DataView. B. Incorrect. The associated DataTable object s DataRow is not the correct way to access individual columns in a DataView. C. Correct. Through the indexer of a DataRowView object is the correct way to access an individual column value in a DataView. D. Correct. The DataView uses the DataTable as its data source, so the col umns are the same. 2. Correct Answer: B A. Incorrect. The Find method does not return an individual DataRow. B. Correct. The Find method returns the index of the found row in the DataView. C. Incorrect. The Find method does not return an individual DataRowView. D. Incorrect. The Find method does not return a collection of DataRow objects. 3. Correct Answer: C A. Incorrect. Calling the GetChildRows method of the DataView is not the cor rect way to access related records in a DataView. B. Incorrect. Calling the CreateChildView method of the DataView is not the correct way to access related records in a DataView. C. Correct. The correct way to access related records using a DataView is to call the CreateChildView method of the DataRowView. D. Incorrect. Calling the GetParentRow method of the DataView is not the cor rect way to access related records in a DataView.
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Answers
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7: Case Scenario Answers
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Case Scenario 1: Upgrading an Old Application
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The possible improvements are as follows:
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Start substituting the temporary files with either XML documents or, possibly, DataView objects, depending on the overall restrictions of the existing applica tion architecture. Replace the existing object model with strongly typed DataSet objects where appropriate.
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Case Scenario 2: Slow System Performance
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Use DataSet and DataTable objects to divide the inventory list into smaller chunks. Use DataView filtering to reduce the amount of data the application needs to parse through during a transaction.
8: Lesson Review Answers
Lesson 1
1. Correct Answers: A, C, and D A. Correct. Selecting Add New Data Source from the Data Sources window starts the Data Source Configuration Wizard and populates the Data Sources window with the configured data source. B. Incorrect. Dragging a DataSet from the Toolbox onto a form will not add items to the Data Sources window. C. Correct. Selecting Add New Data Source from the Data menu starts the Data Source Configuration Wizard and populates the Data Sources win dow with the configured data source. D. Correct. Running the Data Source Configuration Wizard populates the Data Sources window with the configured data source.
Answers
2. Correct Answer: B A. Incorrect. Dragging items from Server Explorer onto the Dataset Designer adds items to the typed dataset; it does not create data-bound controls on a form. B. Correct. Dragging items from the Data Sources window onto a form cre ates data-bound controls. C. Incorrect. Dragging items from the ToolBox onto a form does not create data-bound controls D. Incorrect. Setting properties in the Properties window does not create data-bound controls. 3. Correct Answer: B A. Incorrect. Selecting the main node of the related table in the Data Sources window and dragging it onto a form binds controls to the entire table, not just to the related records. B. Correct. Selecting the child node in the Data Sources window and drag ging it onto a form is the correct way to bind controls to related data. C. Incorrect. Dragging a Relation object onto the Dataset Designer creates a rela tionship between tables in your dataset but does not create bound controls. D. Incorrect. Binding to the child DataTable in the DataSet binds to the entire table, not just to the related records.
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