How to save a word file in the physical path in our project and get that path and insert in database?

private void download_character_certificate_word(string str_content_type, string memo_body, string school_id, string base_url)
        {
            string strFileName= "Study_Certificate.doc";
            string strFilePath;
            string strFolder;
            
            StringBuilder str = new StringBuilder();
            str.Append(memo_body);

            Response.Clear();
            Response.ContentType = str_content_type;
            Response.Charset = "";


            switch (str_content_type)
            {
                case "application/vnd.ms-excel":
                    Response.AddHeader("Content-Disposition", "attachment; filename=Study_Certificate.xls;");
                    break;
                case "application/msword":
                    // Response.AddHeader("Content-Disposition", "attachment; filename=Study_Certificate.doc;");
                    Response.AddHeader("Content-Disposition", "attachment; filename="+ strFileName + "");
                    break;
                default: break;
            }

            StringBuilder sbResponseString = new StringBuilder();
            string wordHeader = "";
            sbResponseString.Append(wordHeader);
            sbResponseString.Append(wordBody);
            //strFolder = sbResponseString.saveas(Server.MapPath("~/files/Download_study_certificate/"));
            //strFilePath = strFolder + strFileName;
            //System.IO.FileInfo file = new System.IO.FileInfo(strFilePath);
            Session["Study_certificate_word_document"] = sbResponseString.ToString();
            int length = sbResponseString.Length;
            Session["length"] = length;
            
            Response.Write(sbResponseString.ToString());
    



            //
            //string strPath = strFileName;
            ////string strTextToWrite = TextBox1.Text;
            //FileStream fStream = new FileStream("~/files/Download_study_certificate/"+strFileName+"", FileMode.Append);
            //fStream.Close();
            //StreamWriter sWriter = new StreamWriter(strPath);
            //sWriter.Write(sbResponseString.ToString());
            //sWriter.Close();
            //

            Response.End();
        }