public static frmCustomers GetInstance()
{
if (CustomerForm == null)
{
CustomerForm = new frmCustomers();
}
return(CustomerForm);
}
private void frmCustomers_FormClosed(object sender, FormClosedEventArgs e)
{
CustomerForm = null;
}
private void btnCustomers_Click(object sender, EventArgs e)
{
frmCustomers customersForm = frmCustomers.GetInstance();
customersForm.Show();
}