Select a Printer in ASP.net page

I am trying to print a ReportDocument (Crystal Reports) using the ReportDocument.PrintToPrinter() function. The first parameter that this function needs is the printer name to which the document should be printed. I am trying to use the System.Windows.Forms.PrintDialog class to open up a print dialog and use it to set the printer to which the document should be printed. Here is my code:

ReportDocument rd = LoadReport(litFileName.Text); // Function to generate report document
System.Windows.Forms.PrintDialog pDlg = new System.Windows.Forms.PrintDialog();
pDlg.AllowSomePages = true;
pDlg.ShowHelp = true;

if (pDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
      rd.PrintOptions.PrinterName = pDlg.PrinterSettings.PrinterName;
      int numOfCopies = pDlg.PrinterSettings.Copies;
      rd.PrintToPrinter(numOfCopies,true,1,1);
}

When I run this code, I get the following error (thrown on the ShowDialog() method call): "It is invalid to show a modal dialog or form when the application is not running in UserInteractive mode. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application."

After doing some web-searching, it seems that you cannot open a Windows.Forms dialog/message box through an ASP.net application.

Is this true? If so, how can I find out the name of the user's default printer in order that I can send this to ReportDocument.PrintToPrinter()??