Trying to open a word document in C#

Hi,
This is the code i am trying to execute ... and I get an error at the following line
            Microsoft.Office.Interop.Word.Document docs = word.Documents.Open(ref path,ReadOnly:true);
           docs is null
 Application word = new Application();             object miss = System.Reflection.Missing.Value;             object path = @"?F:\Resume.docx";             object readOnly = true;             Microsoft.Office.Interop.Word.Document docs = word.Documents.Open(ref path,ReadOnly:true);             string totaltex ...