I am using following code
string FileName = "YourFileName.docx";
Document doc = new Document(FileName);
ActivePrintPreviewDialog previewDlg = new ActivePrintPreviewDialog();
// Pass the Aspose.Words print document to the Print Preview dialog.
previewDlg.Document = doc;
// Specify additional parameters of the Print Preview dialog.
previewDlg.ShowInTaskbar = true;
previewDlg.MinimizeBox = true;
previewDlg.PrintPreviewControl.Zoom = 1;
previewDlg.Document.DocumentName = "TestName.doc";
previewDlg.WindowState = FormWindowState.Maximized;
// Show the appropriately configured Print Preview dialog.
previewDlg.ShowDialog();
but it gives an error ActivePrintPreviewDialog assembly reference not found