private void btnGuardar_Click(object sender, EventArgs e)
{
//SqlCommand cmd = new SqlCommand("sp_insert", cnn);//crear stored procedure
//cmd.CommandType = CommandType.StoredProcedure;
////tabla pacient
data_contact[0] = txtContacto.Text;
data_contact[1] = txtDireccion.Text;
data_contact[2] = txtEmail.Text;
data_contact[3] = txtTelefono.Text;
cnx.InsertData(data_contact, columns_contacts);
MessageBox.Show("Contacto guardado correctamente.");
this.Hide();
menu.Show();
}