protected void upload_click(object sender, EventArgs e)
        {
            Page.Validate("ValidateForm2");
            if (!Page.IsValid)
            {
                ScriptManager.RegisterStartupScript(this, this.GetType(), "Pop", "showModal();", true);
            }
            else
            {
                //check if is what content
                string val = rblUploadType.SelectedValue.ToLower().Trim();
                if (val.Equals("file"))
                {
                    if (FileUpload1.HasFile)
                    {
                        int    coursedir     = current.getCourseID();
                        string fileName      = FileUpload1.FileName;
                        string filepath      = "~/Data/" + coursedir + "/";
                        string FileExtension = fileName.Substring(fileName.LastIndexOf('.') + 1).ToLower();
                        if (FileExtension.Equals("pdf") || FileExtension.Equals("jpeg") || FileExtension.Equals("png") || FileExtension.Equals("doc") ||
                            FileExtension.Equals("docx") || FileExtension.Equals("xlsx") || FileExtension.Equals("csv") || FileExtension.Equals("xlsm") ||
                            FileExtension.Equals("mp3") || FileExtension.Equals("mp4") || FileExtension.Equals("avi") || FileExtension.Equals("m4a") ||
                            FileExtension.Equals("zip") || FileExtension.Equals("rar") || FileExtension.Equals("ppt") || FileExtension.Equals("jpg") ||
                            FileExtension.Equals("pptx"))
                        {
                            FileUpload1.PostedFile
                            .SaveAs(Server.MapPath(filepath) + fileName);
                            string           totalpath1 = Server.MapPath(filepath) + fileName;
                            Course_elearnDAO cdao       = new Course_elearnDAO();
                            Upload           u          = new Upload(current, DateTime.Now, uploadTitleInput.Text, uploadDescriptionInput.Text, totalpath1);
                            u.upload_type = "file";
                            Upload upload_succ = cdao.upload_entry(u);

                            //set audit
                            User currentUser = (User)Session["currentUser"];
                            setAudit(currentUser, "course", "update", coursedir.ToString(), "uploaded filename: " + fileName);
                        }
                    }
                }
                else if (val.Equals("video"))
                {
                    string           title = TextBox1.Text;
                    string           desc  = TextBox2.Text;
                    string           link  = txtVideo.Text;
                    Course_elearnDAO cdao  = new Course_elearnDAO();
                    Upload           u     = new Upload(current, DateTime.Now, TextBox1.Text, TextBox2.Text);
                    u.upload_type = "video";
                    u.video_link  = link;
                    Upload upload_succ = cdao.upload_entry_video(u);

                    //set audit
                    User currentUser = (User)Session["currentUser"];
                }
                else
                {
                    string link = TextBox5.Text;
                    if (FileUpload2.HasFile)
                    {
                        int    coursedir     = current.getCourseID();
                        string fileName      = FileUpload2.FileName;
                        string filepath      = "~/Data/" + coursedir + "/";
                        string FileExtension = fileName.Substring(fileName.LastIndexOf('.') + 1).ToLower();
                        if (FileExtension.Equals("pdf") || FileExtension.Equals("jpeg") || FileExtension.Equals("png") || FileExtension.Equals("doc") ||
                            FileExtension.Equals("docx") || FileExtension.Equals("xlsx") || FileExtension.Equals("csv") || FileExtension.Equals("xlsm") ||
                            FileExtension.Equals("mp3") || FileExtension.Equals("mp4") || FileExtension.Equals("avi") || FileExtension.Equals("m4a") ||
                            FileExtension.Equals("zip") || FileExtension.Equals("rar") || FileExtension.Equals("ppt") || FileExtension.Equals("jpg") ||
                            FileExtension.Equals("pptx"))
                        {
                            FileUpload2.PostedFile
                            .SaveAs(Server.MapPath(filepath) + fileName);
                            string           totalpath1 = Server.MapPath(filepath) + fileName;
                            Course_elearnDAO cdao       = new Course_elearnDAO();
                            Upload           u          = new Upload(current, DateTime.Now, TextBox3.Text, TextBox4.Text, totalpath1);
                            u.upload_type = "both";
                            u.video_link  = link;
                            Upload upload_succ = cdao.upload_entry_both(u);

                            //set audit
                            User currentUser = (User)Session["currentUser"];
                            setAudit(currentUser, "course", "update", coursedir.ToString(), "uploaded filename: " + fileName);
                        }
                    }
                }
            }
        }