How to Send Test.zpl file to ZT410.

Here is the C# Code to send the Test.zpl file to ZT410. when i execute it flash data light once and nothing print. My codes are like this,

 

  private void button1_Click(object sender, EventArgs e)

        {

            System.IO.StreamReader filetoprint;

            filetoprint = new System.IO.StreamReader(@"D:\RFID CSharp Project\PrintFileToPrinter\TEST.ZPL");

            printDocument1.Print();

           filetoprint.Close();

        }