/// <summary>
        /// add user and the course to a table in the database
        /// </summary>
        /// <param name="sender">The button is the sender object</param>
        /// <param name="e">The event argument for the button click event</param>
        protected void AddUserAndCourse_Click(object sender, EventArgs e)
        {
            WebSim.DTO.UserAndCourse userInCourse = new WebSim.DTO.UserAndCourse();
            WebSim.Business.UserBusiness addUserAndCourse = new WebSim.Business.UserBusiness();

            userInCourse.userName = DropDownListUser.SelectedValue.ToString();
            userInCourse.courseName = DropDownListCourse.SelectedValue.ToString();

            addUserAndCourse.AddUserToCourse(userInCourse);
        }