private static void ReadData(string connectionString)
{
    string queryString="SELECT * FROM TABLE;";
    using (SqlConnection connection=new SqlConnection(connectionString))
    {
  SqlCommand command = new SqlCommand(queryString,connection);
  connection.Open();
  SqlDataReader reader=command.ExecuteReader();
  try
  {
      while(reader.Read())
      {
    Console.WriteLine(String.Format("{0},{1}",reader[0],reader[1]));
      }
  }
  finally
  {
      //Always call Close when done reading
      reader.Close();
  }
    }
}