do we need using for the SqlCommand or is it enough just for the SqlConnection and SqlDataReader

Question

i took this code from msdn

string connString = \"Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;\";

    using (SqlConnection conn          


        

Answer 1

You need a using for every object you create that implements IDisposable. That includes the SqlCommand and the SqlConnection.

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There are very few exceptions to this rule. The main exception is WCF client proxies. Due to a design flaw, their Dispose method can sometimes throw an exception. If you used the proxy in a using statement, this second exception would cause you to lose the original exception.

Answer 2

You don't NEED to use a using statement, but it is good practice and you SHOULD use it. It allows objects using IDisposable to be disposed of automatically.

http://msdn.microsoft.com/en-us/library/yh598w02(VS.80).aspx

Edited to add link and remove inaccurate statement because @John Saunders is right.