When do we need to call Dispose() in dot net c#?

Question

Do I need to dispose a sqldatareader after it is created?

SqlDataReader reader;
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reader.Close();
reader.Dispose();

Answer 1

It is recommended to use the using pattern when dealing with anything that implements IDisposable

using ()
{
    // use it here
}

This will look after the try..catch..finally construct and calling Dispose.

EDIT I had previously said that I thought Close and Dispose did the same thing for readers (stream, file, sqldatareader etc.) but it appears this is not true looking at the documentation on SQLDataReader so my assumption was wrong.