Print html document from Windows Service without print dialog

I am using a windows service and i want to print a .html page when the service will start. I am using this code and it's printing well. But a print dialog box come, how do i print without the print dialog box?

public void printdoc(string document)
{
    Process printjob = new Process();

    printjob.StartInfo.FileName = document;
    printjob.StartInfo.UseShellExecute = true;
    printjob.StartInfo.Verb = "print";
    printjob.StartInfo.CreateNoWindow = true;
    printjob.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

    printjob.Start();
}

Have there any other way to print this without showing the print dialog box.

Update: in response to this:

But i have already used this class but when i am calling the

axW.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT,SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_PROMPTUSER , ref em, ref em);

My program getting block here when i am using from window service but it is working fine from windows application.

First off, here's the code:

using System.Reflection;
using System.Threading;
using SHDocVw;

namespace HTMLPrinting
{
  public class HTMLPrinter
  {
    private bool documentLoaded;
    private bool documentPrinted;

    private void ie_DocumentComplete(object pDisp, ref object URL)
    {
      documentLoaded = true;
    }

    private void ie_PrintTemplateTeardown(object pDisp)
    {
      documentPrinted = true;
    }

    public void Print(string htmlFilename)
    {
      documentLoaded = false;
      documentPrinted = false;

      InternetExplorer ie = new InternetExplorerClass();
      ie.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(ie_DocumentComplete);
      ie.PrintTemplateTeardown += new DWebBrowserEvents2_PrintTemplateTeardownEventHandler(ie_PrintTemplateTeardown);

      object missing = Missing.Value;

      ie.Navigate(htmlFilename, ref missing, ref missing, ref missing, ref missing);
      while (!documentLoaded && ie.QueryStatusWB(OLECMDID.OLECMDID_PRINT) != OLECMDF.OLECMDF_ENABLED)
        Thread.Sleep(100);

      ie.ExecWB(OLECMDID.OLECMDID_PRINT, OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref missing, ref missing);
      while (!documentPrinted)
        Thread.Sleep(100);

      ie.DocumentComplete -= ie_DocumentComplete;
      ie.PrintTemplateTeardown -= ie_PrintTemplateTeardown;
      ie.Quit();
    }
  }
}

1. You can access the SHDocVw namespace by adding a reference to 'Microsoft Internet Controls', found on the COM tab of the Add Reference dialog.
2. More information on the InternetExplorer object can be found on MSDN.
3. The Navigate() method will load the HTML file. The other parameters allow you to specify optional parameters, such as flags and headers.
4. We can't print until the document is loaded. Here, I enter a loop waiting until the DocumentComplete event is called, upon which a flag is set notifying us that navigation has completed. Note that DocumentComplete is called whenever navigation is finished - upon success or failure.
5. Once the documentLoaded flag is set, the printing status is queried via QueryStatusWB() until printing is enabled.
6. Printing is started with the ExecWB() call. The OLECMDID_PRINT command is specified, along with the option OLECMDEXECOPT_DONTPROMPTUSER to automatically print without user interaction. An important note is that this will print to the default printer. To specify a printer, you will have to set the default printer (in code, you could call SetDefaultPrinter()). The two final parameters allow optional input and output parameters.
7. We don't want to quit until printing is complete, so once again a loop is entered. After the PrintTemplateTeardown event is fired, the documentPrinted flag is set. The objects can then be cleaned up.

From this site http://www.ussbd.com/printhtm.html

using HtmlPrinter;
hpObj=new HtmlPrinter.HtmlPrinter();
hpObj.PrintUrlFromMemory(txtUrl.Text);

Now you add the code in your project to print html page from its source text:

HtmlPrinter.HtmlPrinter hpObj=new HtmlPrinter.HtmlPrinter();
hpObj.PrintHtml(txtString.Text, true);

If you want to print without the print dialog then use the following line:

hpObj.PrintHtml(txtString.Text, false); 

Here's another way to print without a print dialog. You create a PrintDialog object, initialize it and then call the Print() method.

The function below is used to print a small 2"x0.75" barcode label. You'll need to figure out a way to get an Document object from the html file.

public void PrintToPrinter(string printerName)
{
    PrintDialog pd = new PrintDialog();
    pd.Document = userControl11.PrintDoc; // <--- Update this line with your doc
    pd.PrinterSettings.PrinterName = printerName;
    try
    {
            pd.Document.DocumentName = "My Label";
            pd.Document.DefaultPageSettings.PaperSize = new System.Drawing.Printing.PaperSize("2-.75", 200, 75);
            pd.Document.DefaultPageSettings.Margins = new System.Drawing.Printing.Margins(0, 0, 0, 0);
            //pd.PrinterSettings.Copies = (short)mNumCopies;
            pd.Document.PrinterSettings.Copies = (short) mNumCopies;
            pd.Document.Print();
    }
    catch
    {
        MessageBox.Show("INVALID PRINTER SPECIFIED");
    }
}