private void btnChangeRole_Click(object sender, EventArgs e)
{
UserModel user = new UserModel()
{
UserId = Convert.ToInt32(listViewUser.SelectedItems[0].SubItems[0].Text),
TypeOfUser = listViewUser.SelectedItems[0].SubItems[5].Text,
};
UserOverview.ChangeRole(user);
FillListView();
}
