private void insertToolStripMenuItem1_Click(object sender, EventArgs e)
{
InsertIntoCustomers f2 = new InsertIntoCustomers();
f2.Show();
this.Hide();
}
private void AddCustomer(object sender, EventArgs e)
{
InsertIntoCustomers f2 = new InsertIntoCustomers();
f2.Show();
this.Hide();
}