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What is abstract class or abstract method?
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  • Q You are creating an ASP.NET application for TestKing. The application will be used to identify potential customers. Your application will call an XML Web service run by Wide World Importers. The XML Web service will return an ADO.NET DataSet object containing a list of companies that purchase wine. You want to merge this DataSet object into a DataSet object containing a list of companies that are potential customers. You specify wideWorld as the name of the DataSet object form Wide World Importers, and you specify customerProspects as the name of the DataSet object containing potential customers. After the merge, customerProspects will include the company names in wideWorld. The two DataSet objects contain tables that have the same names and primary keys. The tables in the two DataSet objects contain columns that have the same names and data types. A table in wideWorld also contains additional columns that you do not want to add to customerProspects. If customerProspects included any tables containing rows with pending changes, you want to preserve the current values in those rows when the merge occurs. Which lime of code should you use to merge the wideWorld DataSet object into customerProspects DataSet object? A. customerProspects.Merge (wideWorld, true, MissingSchemaAction.Ignore); B. customerProspects.Merge (wideWorld, true, MissingSchemaAction.AddWithKey); C. wideWorld.Merge (customerProspects, true, MissingSchemaAction.Ignore); D. wideWorld.Merge (customerProspects, true, MissingSchemaAction.Add);