What does the term immutable mean?

Whenever the value of the variable is changed , a new object will be created.

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Can you store multiple data types in System.Array?

No.

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What is a Nested Master Page ?

A nested Master page is one master page referring another master page.

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what is the use of Application.Exit() method?

Notifies all message loops to quit, closes windows opened by them and closes program.

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what is the use of the Environment.Exit() method?

Terminates the program and gives the return value to os as exit code.

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