private void createProfileButton_Click(object sender, EventArgs e)
        {
            if (!IsValidated())
            {
                return;
            }

            //add new user and set properties
            var newUser = new User
            {
                Username     = newUsernameTextBox.Text,
                FirstName    = firstNameTextBox.Text,
                LastName     = lastNameTextBox.Text,
                EmailAddress = emailTextBox.Text,
                Location     = locationTextBox.Text
            };

            _context.Users.Add(newUser);
            _context.SaveChanges();


            this.Hide();

            Form newActivitiesListForm = new ActivitiesListForm(newUser);

            newActivitiesListForm.Show();
        }
        private void signInButton_Click(object sender, EventArgs e)
        {
            _user = (User)availableUserDropDown.SelectedValue;

            Form newActivitiesListForm = new ActivitiesListForm(_user);

            newActivitiesListForm.Show();

            this.Hide();
        }