c# byte字节数组与string字符串之间的转换

            字符串转换为字节数组:

           string str = richTextBox2.Text.Trim()+"\r\n";

            byte[] buffer = Encoding.UTF8.GetBytes(str);

            socketSend.Send(buffer);

           字节数组转换为字符串:

           byte[] buffer = new byte[1024 * 1024 * 2];

           client_socket.Receive(buffer);

           string str = Encoding.UTF8.GetString(buffer, 0, buffer.Length);

           MessageBox.Show(string);