byte i = 0;
            byte[] Data1 = new byte[8];
            Data1[1] = 0x78;           
            switch (i)
            {
                case 0x20:
                    Data1[3] = 0x20;
                    break;
                case 0x21:
                    Data1[3] = 0x21;
                    break;
                case 0x22:
                    Data1[3] = 0x22;
                    break;
                case 0x23:
                    Data1[3] = 0x23;
                    break;
                case 0x24:
                    Data1[3] = 0x24;
                    break;
                case 0x25:
                    Data1[3] = 0x25;
                    break;
                case 0x26:
                    Data1[3] = 0x26;
                    break;
                case 0x27:
                    Data1[3] = 0x27;
                    break;
                case 0x28:
                    Data1[3] = 0x28;
                    break;
                case 0x29:
                    Data1[3] = 0x29;
                    break;
                case 0x30:
                    Data1[3] = 0x30;
                    break;
            }
            serialPort1.Write(Data1, 0, 8);
            serialPort1.Read(Data1, 0, 8);

             byte[] data1 = new byte[25];
            string str = " ";
            switch (Data1[3])
            {
                case 0x20:
                    str = "1";
                    str += "1";
                    break;
                case 0x21:
                    str = "2";
                    str += "2";
                    break;
                case 0x22:
                    str = "3";
                    str += "3";
                    break;
                case 0x23:
                    str = "4";
                    str += "4";
                    break;
                case 0x24:
                    str = "5";
                    str += "5";
                    break;
                case 0x25:
                    str = "6";
                    str += "6";
                    break;
                case 0x26:
                    str = "7";
                    str += "7";
                    break;
                case 0x27:
                    str = "8";
                    str += "8";
                    break;
                case 0x28:
                    str = "9";
                    str += "9";
                    break;
                case 0x29:
                    str = "0";
                    str += "0";
                    break;
                case 0x30:
                    str = ".";
                    str += ".";
                    break;
            }

            data1[0] = 0xAA;
            data1[1] = 0x54;
            data1[2] = 0x00;
            data1[3] = 0x59;
            data1[4] = 0x00;
            data1[5] = 0x30;
            for (int a = 6; a <8; a++)
            {                
                data1[a] = System.Convert.ToByte(str[a - 6]);

            }  
            data1[21] = 0xCC;
            data1[22] = 0x33;
            data1[23] = 0xC3;
            data1[24] = 0x3C; 

            if (Data1[3] == 0x20&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x21&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x22&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x23&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x24&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x25&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x26&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x27&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x28&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x29&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);                         
            if (Data1[3] == 0x30&& Data1[1] == 0x78 && Data1.Length == 8)
                serialPort1.Write(data1, 0, 25);    
我是刚学习C#的，我想让两位的数字一个一个显示，而不是一次性显示出来，请问有什么方法吗？请各位指教