Send document to printer with C#

Microsoft.Office.Interop.Word.ApplicationClass msWord = new Microsoft.Office.Interop.Word.ApplicationClass();

object paramUnknown = Type.Missing;
object missing = Type.Missing;
object paramSaveChangesNo = Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges;
//object paramFonts = Microsoft.Office.Interop.Word.wde
object paramFormatPDF = Microsoft.Office.Interop.Word.WdSaveFormat.wdFormatPDF;
object paramTrue = true;
object paramReadOnly = true;
object sourceDoc = @"c:input.doc"
object target = @"c:output.pdf";

msWord.Visible = false;

//open .doc
msWord.Documents.Open(ref sourceDoc, ref paramUnknown, ref paramReadOnly, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown);

//so it won't show on the taskbar
msWord.Application.Visible = false;
msWord.WindowState = Microsoft.Office.Interop.Word.WdWindowState.wdWindowStateMinimize;

//save .doc to new target name and format
msWord.ActiveDocument.SaveAs(ref targetDoc, ref paramFormatPDF, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramTrue, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown, ref paramUnknown);

msWord.ActiveDocument.Close(ref missing, ref missing, ref missing);

msWord.Quit(ref paramSaveChangesNo, ref paramUnknown, ref paramUnknown);