//(EVENT) UPLOAD IMAGES (button)
        protected void UploadButtonImages_Click(object sender, EventArgs e)
        {
            string radio = "";

            //which radio button was picked
            if (rad_piping.Checked)
            {
                radio = "Piping_files\\";
            }
            else if (rad_struct.Checked)
            {
                radio = "Struct_files\\";
            }
            else if (rad_elect.Checked)
            {
                radio = "Elect_files\\";
            }
            else if (rad_piping_elect.Checked)
            {
                radio = "PipingElect_files\\";
            }
            else if (rad_piping_struct.Checked)
            {
                radio = "PipingStruct_files\\";
            }
            else if (rad_struct_elect.Checked)
            {
                radio = "StructElect_files\\";
            }

            //upload files here
            string pathPutFiles = ProjectFolder.GetCurrentProjectImageFolder() + "\\" + radio;

            FileManager.UploadFiles(FileUploadImages, NotificationLabel, pathPutFiles);

            //call javascript (for view function)(stay on settings page)
            Page.ClientScript.RegisterStartupScript(this.GetType(), "btnUpload", "view.btn_upload();", true);
        }