SqlConnection conn = new SqlConnection();
            conn.ConnectionString = "server=10.68.69.203,81;database=cpudata;user id =sa;password=19790601";
            try
            {
                //------------------结论这种方法是不合适的---------------------
                conn.Open();
                Console.WriteLine(conn.State.ToString());
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = "backup database cpudata to disk='d:\a.bak'";
                int i = cmd.ExecuteNonQuery();
                Console.WriteLine(i.ToString());
            }
            catch (Exception ex)
            {

                throw ex;
            }
            finally
            {
                conn.Close();
            }
            Console.ReadLine();