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

Rule of thumb: if a class implements IDisposable you should always call the Dispose method as soon as you have finished using this resource. Even better wrap it in a using statement to ensure that the Dispose method will be called even if an exception is thrown:

using (var reader = conn.ExecuteReader())
{
    ...
}