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();
 }