void CreateNewUser_Click(object sender, EventArgs e)
        {
            frmUser NewUser = new frmUser();

            if (NewUser.ShowDialog() == DialogResult.Cancel)
            {
                return;
            }
            UpdateUserList();
        }
        void EditUser_Click(object sender, EventArgs e)
        {
            if (lstUserList.SelectedItems.Count == 0)
            {
                return;
            }

            frmUser EditUser = new frmUser(lstUserList.SelectedItems[0].SubItems[0].Text);

            if (EditUser.ShowDialog() == DialogResult.Cancel)
            {
                return;
            }
            UpdateUserList();
        }