[C#, HID] How to write data in HID connection with using USBHIDDRIVER.dll

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C#

public void sendStartCMD()
        {
            byte[] startCMD = new byte[8];
            //Start
            startCMD[0] = 255;
            //Mode
            startCMD[1] = 0;
            //USync
            startCMD[2] = 28;
            //ULine
            startCMD[3] = 20;
            //tSync
            startCMD[4] = 20;
            //tRepeat - High
            startCMD[5] = 0;
            //tRepeat - Low
            startCMD[6] = 0x01;
            //BusMode
            startCMD[7] = 0xF4;
            //send the command
            
            usbI.Connect();
            usbI.write(startCMD);
        }

Hi, I am new to C# and HID USB communication.
I am having trouble with sending data.
I am trying with USBHIDDRIVER.dll. and I checked receiving data well.
However, When I try sending data with the function above, usbI.write()function always returns false.
When I checked with Beagle, there is no data out.

and also when I checked the function below, "NumberOfBytesWritten" has 0 after the function excuted.

Result = USBSharp.WriteFile(hidHandle, ref outputReportBuffer[0], outputReportBuffer.Length, ref NumberOfBytesWritten, 0);

How can I send data properly? Please let me know if there is something I am missing.

Thank you very much,