//on Click function. this function deleate the selected user
private void DeleteUser(object sender, EventArgs e)
{
try
{
userManager.DeleteUser(this.editingUser, this.Email, this.PassHash);
this.cancelEditing(sender, e);
}catch (Exception exc)
{
MessageBox.Show("Errore nella connessione al server.", "Proprio non riesco a eliminare l'utente.", MessageBoxButtons.OK);
}
}