New to PIC and USB. problem getting data from PIC in c#

Hello, I’m new to pic and usb programming.
So I start to test the article Basic USB - Using Microchip Stack and C#.Net - Hardware form www.PICcoder.co.uk
This code works, but I got some trouble when I’m trying to receive more then 1byte from the microcontroller.
The thing I’m trying to do it that when I send the command 0x50 to the microcontroller, I need to get some data back from it. I’m using c# and ask for 4bit of data.
The problem is that the LED is working but I just get data back from the PIC every second time I run the command 0x50..
This is the code I have modified in to the PIC project:
Then I use the SendReceivePacket function and it returns this STRING 50495051.
The next time I use SendReceivePacket I got the STRING 0000.
ExpectedReceiveLength = 4
ReceiveLength = 0

Why?? The LED4 is flashing every time, but I can’t get data from the CHIP more then every second time I hit my button in the form1.
Please help me?? What am I doing wrong???

hum it is the transparency of the state 1 2 3 you need to watch for

use 0x01 0x02 not '1' '2' remember zero is also a state so 1 is really 2

try that

case LED:
mLED_4_Toggle();
dataPacket._byte[1]= 0x01; // {really state '2' } also maybe you need to start 0x00
dataPacket._byte[2]= 0x02; // {really state '3' } 0x01
dataPacket._byte[3]= 0x03; // 0x02
.. missing paket here byte 4
counter=0x04; /{remember this is 5 states 0x00 0x01 0x02 0x03 0x04 maybe you need 0x03 here instead of 4}
break;

also watch for dataPacket_byte[0] ?? is this used somewhere else??

so given this

more like

case LED:
mLED_4_Toggle();
dataPacket._byte[0]= 0x00;
dataPacket._byte[1]= 0x01;
dataPacket._byte[2]= 0x02;
dataPacket._byte[3]= 0x03;
counter=0x03;
break;

Hello...

dataPacket_byte[0] ?? is used somewhere else.
So the total number of bytes to send is 4.
I have try'd to set it to 3 and 5 but it is the same resoulte.

The function in c# is geting the 4bytes. But the next time I ask for 4bytes it returns 1byte.. I have made a work around for this so its not a bigg problem, but it's stupid to do this when I down't thing it shod work like this.

I thing there has to bee some body else that have try the exemple to www.PICcoder.co.uk and got the same problem..???