刚学C#不久，


===========================代码====================================================================================================
          OracleConnection conn = new OracleConnection(@"Data Source=xxdb;User Id=xxuser;Password=xxpass;Integrated Security=no;");
                String cmd = "select * from users";
                            OracleDataAdapter orcl = new OracleDataAdapter(cmd, conn);
                            DataSet myDataSet = new DataSet();
                            orcl.Fill(myDataSet, "tt");
                            DataGridView5.DataSource = myDataSet;
                            DataGridView5.DataMember = "tt";
                            DataGridView5.Columns[0].HeaderText = "编号";
                            DataGridView5.Columns[1].HeaderText = "姓名";
                            .............
                            conn.Close();
=====================================================================================================================================
我要做的东西有许多基础信息需要维护，连接的是不同的表，上面是其中的第一个表
我不明白的是
1.conn.Close();之后，orcl,Dataset,是否还在存在?
2.如果要再设置其它基本信息，最好的办法是如何做？
谢谢！