c# - C# でアップロード システムを変更する

Question

コードを .docx または .pdf でアップロードできるようにしたいのですが、どうすればコードを変更できますか? 私のデータが画像の場合、私はアップロードできます

aspx.cs に私のコードがあります

protected void save_Click(object sender, EventArgs e)
{
    //upload photo
    int h, w; string Folder = "photo/";
    h = 298; w = 765;
    string asl = uploadIncResize(h, w, Folder, upload, false);
    string insert = "insert into PM_formKL(title, proponent, assessor, score, upload) "
                    + "values('" + Cf.StrSql(title.Text) + "','" + Cf.StrSql(proponent.Text) + "','" + Cf.StrSql(assessor.Text) + "','" + Cf.StrSql(score.Text) + "','" + asl + "')";
    Db.Execute(insert);

    Response.Redirect("/detail penilaian/KL/formkl.aspx");
}

// SO upload image
protected string uploadFile(string Folder, FileUpload img)
{
    string upload_file = "";
    try
    {
        string filename = Path.GetFileName(img.FileName);
        string dir = Param.PathImage + Folder;
        bool status = true;

        while (status)
        {
            status = FileExists(filename, Server.MapPath("~/images/" + Folder));
            if (status)
                filename = getRandomFileName() + System.IO.Path.GetExtension(img.PostedFile.FileName);
        }

        //teaser_image.SaveAs(Server.MapPath("~/images/") + Folder + filename);
        upload_file = filename;
        string large = dir + filename;

        img.PostedFile.SaveAs(large);
    }
    catch (Exception ex)
    {
        Js.Alert(this, "Upload status: The file could not be uploaded. The following error occured: " + ex.Message);
    }
    return upload_file;
}

protected string uploadIncResize(int h, int w, string Folder, FileUpload img, bool resize)
{
    string upload_file = "";
    try
    {
        if (img.PostedFile.ContentType == "image/jpeg" || img.PostedFile.ContentType == "image/png" || img.PostedFile.ContentType == "image/gif")
        {
            string filename = Path.GetFileName(img.FileName);
            string dir = Param.PathImage + Folder;
            bool status = true;

            while (status)
            {
                status = FileExists(filename, Server.MapPath("~/images/" + Folder));
                if (status)
                    filename = getRandomFileName() + System.IO.Path.GetExtension(img.PostedFile.FileName);
            }

            upload_file = filename;

            string temp = dir + "(kl)" + filename;
            string large = dir + filename;

            img.PostedFile.SaveAs(temp);
            if (resize)
            {
                Imgh.Crop(temp, large, h, w);
            }
            else
            {
                img.PostedFile.SaveAs(large);
            }
            File.Delete(temp);
            Js.Alert(this, "Upload status: upload successfull.");
        }
        else
            Js.Alert(this, "Upload status: Only JPEG , PNG or GIF files are allowed!");
    }
    catch (Exception ex)
    {
        Js.Alert(this, "Upload status: The file could not be uploaded. The following error occured: " + ex.Message);
    }
    return upload_file;
}

protected string getRandomFileName()
{
    Random rand = new Random((int)DateTime.Now.Ticks);
    int newFile = 0;
    newFile = rand.Next(1, 9999999);

    return newFile.ToString();
}

protected bool FileExists(string filename, string path)
{
    FileInfo imageFile = new FileInfo(path + filename);
    bool fileStatus = imageFile.Exists;
    return fileStatus;
}