What is the difference between the using statement and directive in C#?

Question

this is basically a tutorial question to ask since am a beginner I would like to what is a difference between the using statement we use at start of our C# code to include a

Answer 1

using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))

This using disposes the adapter object automatically once the control leaves the using block.

This is equivalent to the call

SqlDataAdapter adapter = new SqlDataAdapter(cmd)
adapter.dispose();

See official documentation on this: http://msdn.microsoft.com/en-us/library/yh598w02(v=vs.71).aspx