Connecting to the device via zkemkeeper.dll in windows application C# .net
<p>I'm trying to connecting RFID and bio metrics devices in network, my local ip is <code>192.168.1.24</code> and the RFID device ip is <code>192.168.1.22</code>, I'm using Visual studio 12 an sample windows application. to connect this device but it throws an error: </p>

<blockquote>
  <p>Unable to connect the device,error code = -201</p>
</blockquote>

<pre><code>private void btnConnect_Click(object sender, EventArgs e)
{

    if (txtIP.Text.Trim() == "" || txtPort.Text.Trim() == "")
    {
        MessageBox.Show("IP and Port cannot be null", "Error");
        return;
    }
    int idwErrorCode = 0;
    Cursor = Cursors.WaitCursor;

    if (btnConnect.Text == "DisConnect")
    {
        axCZKEM1.Disconnect();

        this.axCZKEM1.OnVerify -= new zkemkeeper._IZKEMEvents_OnVerifyEventHandler(axCZKEM1_OnVerify);
        this.axCZKEM1.OnAttTransactionEx -= new zkemkeeper._IZKEMEvents_OnAttTransactionExEventHandler(axCZKEM1_OnAttTransactionEx);
        this.axCZKEM1.OnNewUser -= new zkemkeeper._IZKEMEvents_OnNewUserEventHandler(axCZKEM1_OnNewUser);
        this.axCZKEM1.OnHIDNum -= new zkemkeeper._IZKEMEvents_OnHIDNumEventHandler(axCZKEM1_OnHIDNum);
        this.axCZKEM1.OnWriteCard -= new zkemkeeper._IZKEMEvents_OnWriteCardEventHandler(axCZKEM1_OnWriteCard);
        this.axCZKEM1.OnEmptyCard -= new zkemkeeper._IZKEMEvents_OnEmptyCardEventHandler(axCZKEM1_OnEmptyCard);

        bIsConnected = false;
        btnConnect.Text = "Connect";
        lblState.Text = "Current State:DisConnected";
        Cursor = Cursors.Default;
        return;
    }

    axCZKEM1.PullMode = 1;
    bIsConnected = axCZKEM1.Connect_Net(txtIP.Text.Trim(), Convert.ToInt32(txtPort.Text.Trim()));


    if (bIsConnected == true)
    {
        btnConnect.Text = "DisConnect";
        btnConnect.Refresh();
        lblState.Text = "Current State:Connected";
        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.

        if (axCZKEM1.RegEvent(iMachineNumber, 65535))//Here you can register the realtime events that you want to be triggered(the parameters 65535 means registering all)
        {
            this.axCZKEM1.OnVerify += new zkemkeeper._IZKEMEvents_OnVerifyEventHandler(axCZKEM1_OnVerify);
            this.axCZKEM1.OnAttTransactionEx += new zkemkeeper._IZKEMEvents_OnAttTransactionExEventHandler(axCZKEM1_OnAttTransactionEx);
            this.axCZKEM1.OnNewUser += new zkemkeeper._IZKEMEvents_OnNewUserEventHandler(axCZKEM1_OnNewUser);
            this.axCZKEM1.OnHIDNum += new zkemkeeper._IZKEMEvents_OnHIDNumEventHandler(axCZKEM1_OnHIDNum);
            this.axCZKEM1.OnWriteCard += new zkemkeeper._IZKEMEvents_OnWriteCardEventHandler(axCZKEM1_OnWriteCard);
            this.axCZKEM1.OnEmptyCard += new zkemkeeper._IZKEMEvents_OnEmptyCardEventHandler(axCZKEM1_OnEmptyCard);
        }

        MyCountFinger = 1;
        MyCountFace = 2;

    }
    else
    {
        axCZKEM1.GetLastError(ref idwErrorCode);
        MessageBox.Show("Unable to connect the device,ErrorCode=" + idwErrorCode.ToString(), "Error");
    }
    Cursor = Cursors.Default;
}
</code></pre>

<p>Please do help thanks in advance</p>