1:   To access DataTable Class which namespace you should use?
Options:
  1. System.Data
  2. System.DataTable
  3. System.Data.SQLClient
  4. System

Answer: Option 1

Explanation:

DataTable class present under System.Data namespace in .NET Framework. Discuss this in Forums

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2:   What namespace is used to access DataSet class?
Options:
  1. System
  2. Data
  3. System.Data
  4. System.Data.DatSet

Answer: Option 3

Explanation:

You can access DataSet class using System.Data namespace. Discuss this in Forums

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My dear Watson," said [Sherlock Holmes], "I cannot agree with those who rank modesty among the virtues. To the logician all things should be seen exactly as they are, and to underestimate one's self is as much a departure from truth as to exaggerate one's own powers.
-Arthur Conan Doyle The Adventure of the Greek Interpreter