Collections and ADO.NET Overview

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Questions and Answers

Match the following terms related to collections with their definitions:

Array = A fixed-size data structure for storing elements Collection = A flexible data structure for managing groups of objects Add Method = A method used to insert an element into a collection Count Property = A property that returns the number of elements in a collection

Match the following namespaces with their purposes:

System.Collections.Generic = Contains classes for generic collections System.Collections.ObjectModel = Contains classes for creating reusable collections System.Collections = Basic data collection classes and interfaces System = Base namespace for fundamental classes and functions

Match the following collection operations with their descriptions:

Add = Inserts an item into the collection Remove = Deletes an item from the collection Navigate = Allows moving through the items in the collection Search = Checks for the existence of an item in the collection

Match the following types of collections with their characteristics:

Generic Collection = Provides type safety and better performance Non-generic Collection = Offers flexibility but less type safety List = An ordered collection that allows duplicate elements Dictionary = A collection of key-value pairs for fast lookups Signup and view all the answers

Match the following statements with the correct conclusion about collections:

Collections can dynamically allocate memory = Unlike arrays which are fixed in size Strongly typed collections are more efficient = Because they enforce data type constraints Properties or methods may return collections = To enhance the object model of reusable libraries Collections support various operations = Including adding, removing, and searching for items Signup and view all the answers

Match the CRUD commands with their functions:

InsertCommand = Inserts a row at the data source for rows with a RowState of Added UpdateCommand = Updates rows for all rows with a RowState of Modified DeleteCommand = Deletes rows for all rows with a RowState of Deleted ReadCommand = Retrieves rows from the data source Signup and view all the answers

Match the collection features with their descriptions:

Dynamic size = Flexible working with groups of objects Predefined size = Number of elements must be declared upfront Add elements = Can modify the collection at any point Remove elements = Allows for deletion of items from the collection Signup and view all the answers

Match the type of DataRow state with their definitions:

Added = Row is newly created and not yet saved Modified = Row has been changed since it was last saved Deleted = Row has been marked for removal Unchanged = Row has not been modified since it was loaded Signup and view all the answers

Match the database operation rules with the corresponding command:

InsertCommand = Inserts values for all updateable columns UpdateCommand = Excludes non-updateable columns during updates DeleteCommand = Removes rows with matching primary key values CommitCommand = Commits all changes made to a DataRow Signup and view all the answers

Match the properties of collections with their characteristics:

Collections = Do not require size definition beforehand Arrays = Require a strict size declaration upon creation Flexibility = Collections can grow and shrink dynamically Statically sized = Arrays hold a fixed number of elements Signup and view all the answers

Flashcards

Collections

Allow you to work with a group of objects in a flexible way, meaning you can add or remove elements dynamically.

Arrays

Pre-defined size that cannot be changed after declaration. You need to specify how many elements you want to store within the array.