private  void Connect(string sIp = "10.0.0.44", int iPort = 4370, int iMachineNumber = 1 )
    {
        //Create Standalone SDK class dynamicly.
        zkemkeeper.CZKEMClass axCZKEM1 = new zkemkeeper.CZKEMClass();
        //the boolean value identifies whether the device is connected
        bool bIsConnected = false;
        //the serial number of the device.After connecting the device ,this value will be changed.
        int idwErrorCode = 0;
 

        bIsConnected = axCZKEM1.Connect_Net(sIp, iPort);
        if (bIsConnected == true)
        {
            iMachineNumber = 1;//In fact,when you are using the tcp/ip communication,this parameter will be ignored,that is any integer will all right.Here we use 1.
            axCZKEM1.RegEvent(iMachineNumber, 65535);//Here you can register the realtime events that you want to be triggered(the parameters 65535 means registering all)
                
                axCZKEM1.OnVerify += new zkemkeeper._IZKEMEvents_OnVerifyEventHandler(axCZKEM1_OnVerify);
        }
        else
        {
            axCZKEM1.GetLastError(ref idwErrorCode);
            MessageBox.Show("Unable to connect the device,ErrorCode=" + idwErrorCode.ToString(), "Error");
        }
    }
    private void axCZKEM1_OnVerify(int iUserID)
    {
        MessageBox.Show("RTEvent OnVerify Has been Triggered,Verifying...");
        if (iUserID != -1)
        {
            MessageBox.Show("Verified OK,the UserID is " + iUserID.ToString());
        }
        else
        {
            MessageBox.Show("Verified Failed... ");
        }
    }

    private void Disconnect()
    {
        //Create Standalone SDK class dynamicly.
        zkemkeeper.CZKEMClass axCZKEM1 = new zkemkeeper.CZKEMClass();
        axCZKEM1.Disconnect();

        axCZKEM1.OnVerify -= new zkemkeeper._IZKEMEvents_OnVerifyEventHandler(axCZKEM1_OnVerify);
    }