In ADO.NET, what is the name of the in-memory, disconnected data container that can hold multiple related tables?
-
Aviews.
-
Brelations.
-
Ctables.
-
Ddatasets.
Answer
Correct Answer: datasets.
Explanation
Introduction / Context:ADO.NET introduced a disconnected data architecture to scale across tiers and intermittently connected environments. The core container for in-memory data and relations is designed to mirror a mini database in RAM.
Given Data / Assumptions:
- We are working with .NET data APIs.
- We need a structure that can hold multiple DataTable objects, DataRelation objects, and constraints.
- We want to process data without a constant connection to the database.
Concept / Approach:A DataSet is an in-memory, disconnected cache containing DataTable collections, DataRelation relationships, and constraints. It supports XML serialization (via DiffGrams), enabling transport between tiers and synchronization upon reconnection. The DataSet is different from a single DataTable and from a database view.
Step-by-Step Solution:
Identify the need: multiple tables and relations in memory.Map to ADO.NET type: DataSet holds tables, relations, and constraints.Conclude that “datasets” is the correct answer.Verification / Alternative check:Documentation shows DataSet with DataTableCollection and DataRelationCollection, plus ReadXml/WriteXml for interchange.
Why Other Options Are Wrong:views: Database objects or DataView (a different .NET type), not the container. relations: Part of a DataSet, not the container itself. tables: DataTable is only one table; the question asks for the multi-table container.
Common Pitfalls:Confusing DataSet with Entity Framework contexts; EF uses different abstractions though it can materialize into DataTables/DataSets when needed.
Final Answer:datasets.