How to achieve late binding in c# for Microsoft.office.interop.word?

Question

I want to achieve late binding for the following lines of code which are using early binding. How can I achieve it in C#?

When I removed Microsoft.office.interop.wor

Answer 1

Made the following changes, Its working fine now.

    Type wordType = Type.GetTypeFromProgID("Word.Application");

    dynamic Word = Activator.CreateInstance(wordType);


    object oMissing = System.Reflection.Missing.Value;


    DirectoryInfo dirInfo = new DirectoryInfo(@"\\server\folder");
    FileInfo wordFile = new FileInfo(fileName);

    Word.Visible = false;
    Word.ScreenUpdating = false;

    Object filename = (Object)wordFile.FullName;

    var doc = Word.Documents.Open(ref filename);
    doc.Activate();

    object outputFileName = wordFile.FullName.Replace(".doc", ".pdf");

/*in the WdSaveFormat enum, 17 is the value for pdf format*/ 
    object fileFormat = 17;


    doc.SaveAs(ref outputFileName, ref fileFormat);

 /in the   WdSaveOptions enum, 0 is for Do not save pending changes.*/
    object saveChanges = 0;

    doc.Close(ref saveChanges);
    doc = null;

    Word.Quit();

    MessageBox.Show("Successfully converted");