Dear Zebra Team,

I cannot connect the zebra printer via USB. Here is the code. It is showing like Unable to connect USB device port "USB003". Printer configuration are perfectly setup and test print is working fine. Kindly guide me what is missed in the below code. My zebra SDK version is 2.14.1919 and .net framework is 4.7. Printer model is zebra zt411

private void SendZplOverUSB()
{
Console.WriteLine("Finding Zebra printer...!!!");
Connection thePrinterConn = new UsbConnection("USB003");
Console.WriteLine("USB Connection Open...!!!");
try
{
thePrinterConn.Open();

string zplData = @"^XA
^ILR:SAMPLE.GRF^FS
^XZ";
thePrinterConn.Write(Encoding.UTF8.GetBytes(zplData));
Console.WriteLine("Write ZPL data to printer");
Console.ReadLine();
}
catch (ConnectionException e)
{
// Handle communications error here.
Console.WriteLine(e.ToString());
Console.ReadLine();
}
finally
{
thePrinterConn.Close();
}