private void btn_addCus_Click(object sender, EventArgs e)
{
CategoryCustomer categoryCustomer = new CategoryCustomer();
categoryCustomer.ShowDialog();
Function.FillCombo("SELECT cusID, cusName FROM Customer", cbb_CusID, "cusID", "cusID");
cbb_CusID.SelectedIndex = -1;
}
private void customerToolStripMenuItem_Click(object sender, EventArgs e)
{
CategoryCustomer categoryCustomer = new CategoryCustomer();
categoryCustomer.ShowDialog();
}