ADO.NET and Disposing without Using

Question

I have a project that isn't using USING anywhere with their ADO.NET code. I am cleaning up their unclosed connections. Is the below code a best practice with try/catch/finally. I also have some that contains SqlTransaction that I'm disposing in between the command and connection dispose.

SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["MyNGConnectDashBoardConnectionString"].ToString());
            SqlCommand cmd = new SqlCommand();
            DataSet ds = new DataSet();
            try
            {
                con.Open();
                cmd.Connection = con;

                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);

            }
            catch (Exception ex)
            {
                throw ex;
            }

            finally
            {
                cmd.Dispose();
                con.Dispose();
            }

Answer 1

Actually, there is no need to worry about closing the connection when using the SqlDataAdapter.Fill(dataset) method. This method closes the connection after performing every Fill.

Also, there is no need to call SqlCommand.Dispose() since the command itself has no unmanaged resources to clean up. What you should be concerned about is if SqlConnection.Close() is called at some point. This is done after Fill.