private void addBtn_Click(object sender, EventArgs e)
{
addCustomer = new add_customer();
addCustomer.Show();
FillGrid();
this.Close();
}
private void editBtn_Click(object sender, EventArgs e)
{
addCustomer = new add_customer();
addCustomer._ID = Convert.ToInt32(dataGridView1.CurrentRow.Cells[0].Value.ToString());
addCustomer.saveCustBtn.Text = "Update";
addCustomer.saveCustBtn.ImageKey = "update.png";
addCustomer.Text = "Update Customer";
addCustomer.Show();
FillGrid();
this.Close();
}