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C# Interview Questions and Answers

Ques 1. Whatís the advantage of using System.Text.StringBuilder over System.String?

StringBuilder is more efficient in the cases, where a lot of manipulation is done to the text. Strings are immutable, so each time itís being operated on, a new instance is created.

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Ques 2. Can you store multiple data types in System.Array?

You never use System. Array directly. You can store items whose data type is equivalent to, or derived from, the data type of the array. This means that you can store multiple data types, provided that they derive from a common base type, or implement a common interface.

Example:
If you want to store different types, use System.Collections.ArrayList or object[]

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Ques 3. Whatís the difference between the System.Array.CopyTo() and System.Array.Clone()?

The first one performs a deep copy of the array, the second one is shallow.

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Ques 4. How can you sort the elements of the array in descending order?

By calling Sort() and then Reverse() methods.

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Ques 5. Whatís the .NET datatype that allows the retrieval of data by a unique key?

HashTable.

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