private void btnRegister_Click(object sender, EventArgs e)
{
int clinic_number, zip;
string street, city, state, tel, fax;
clinic_number = Convert.ToInt32(txtClinic_number.Text);
zip = Convert.ToInt32(txtZip.Text);
tel = mtxtTel.Text;
fax = mtxtFax.Text;
street = txtStreet.Text;
city = txtCity.Text;
state = txtState.Text;
database.insert_clinic(clinic_number, street, city, state, zip, tel, fax);
this.Close();
}