Sqlconnection and multiple connections

Hi all,

I have a doubt: when I run a query to db and I do a loop based on the results, I create a new SqlConnection for every query as follows:

selectSQL = "SELECT * FROM languages";
            SqlConnection con = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(selectSQL, con);

            try
            {
                con.Open();
                adapter = new SqlDataAdapter(cmd);
                dt = new DataTable();
                adapter.Fill(dt);
                rows = dt.Rows.Count;

                for (int i = 0; i < rows; i++)
                {
                    string SQL="SELECT * FROM ..."
                    SqlConnection cn = new SqlConnection(connectionString);
                    SqlCommand cd = new SqlCommand(SQL, cn);
                    try
                    {
                        cn.Open();
                        .. do the stuff

and in the finally statement I close the connections.

In a website that I have online sometimes I get an error: "timeout expired! max connections reached from the pool" or something like that.

The question is: is this a right approach or it can cause the problem above?

Is it possible to use only one connection to the db and pass it to the SqlCommand?

Thank you