I have create 1 winform to send and read CAN Message of ECU and when i create function Clear All DTC with command: 0x14 0xFF 0xFF 0xFF, Message Response is 7F 14 78 (Request Correctly Received – Response Pending). I add Thread.Sleep to wait for response but it doesn't work very well.

if (receivedMes.DATA[0] == 0x7F && receivedMes.DATA[2] == 0x78)
{
    clsLogManager.LogWarning("Received NRC 0x78, waiting for extended time...");
    Thread.Sleep(m_nIOTimeOut * 50);

    receivedMes = GetResponseClearDTC(ECU_DID.ClearDTCInformation, m_nIOTimeOut);
    if (receivedMes == null || receivedMes.ID == 0 || receivedMes.LENGTH == 0) return false;
}

Help me pls. Thank you.