private static int clearKeeperData(string ipAddr, int port)
{
    int idwErrorCode = 0;
           
    //Create Standalone SDK class dynamicly.
    zkemkeeper.CZKEMClass axCZKEM1 = new zkemkeeper.CZKEMClass();
if (axCZKEM1.Connect_Net(ipAddr, 4370))
    {
        int iMachineNumber = 1;
if (axCZKEM1.ClearKeeperData(iMachineNumber))
        {
            MessageBox.Show("Operation Success! All Data cleared from device: " + ipAddr);
        }
else
        {
            axCZKEM1.GetLastError(ref idwErrorCode);
            MessageBox.Show("Operation failed,ErrorCode=" + idwErrorCode.ToString(), "Error");
        }
    }
else
    {
        axCZKEM1.GetLastError(ref idwErrorCode);
    }
return idwErrorCode;
}