private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
{
txtFirstName.Text = customer.FirstName;
txtLastName.Text = customer.LastName;
txtEmail.Text = customer.Email;
txtState.Text = customer.State;
txtCity.Text = customer.City;
txtUserName.Text = customer.UserName;
txtZip.Text = customer.Zip;
txtAddress.Text = customer.Address;
txtOrderQty.Text = DBConnection.orderQty(customer.CustomerID).ToString();
}
