protected void CreateSubject_Click(object sender, EventArgs e)
        {
            string image = "default.jpg";

            if (FileUpload.HasFile)
            {
                if (FileUpload.PostedFile.ContentType == "image/jpeg" || FileUpload.PostedFile.ContentType == "image/png")
                {
                    try
                    {
                        string filename = Path.GetFileName(FileUpload.FileName);
                        FileUpload.SaveAs(Server.MapPath("~/Subjects/Images/") + filename);
                        image = filename;
                    }
                    catch (Exception ex)
                    {
                    }
                }
            }
            SubjectCRUD subjects   = new SubjectCRUD();
            bool        addSuccess = subjects.AddSubjects(SubjectName.Text, image, Password.Text, User.Identity.GetUserId());

            if (addSuccess)
            {
                Response.Redirect("~");
            }
        }