C#

if (myLabel.BackColor == Color.White)
    {
    ... do something
    }
else
    {
    ... do something else
    }

private void button1_Click(object sender, EventArgs e)
    {
    Button b = new Button();
    b.Text = $"Hello: {++buttonsCount}";
    b.Click += MyAddedButton_Click;
    myFlowLayoutPanel.Controls.Add(b);
    }
private int buttonsCount = 0;
private void MyAddedButton_Click(object sender, EventArgs e)
    {
    Console.WriteLine((sender as Button)?.Text);
    }

private void Btn_Add_Click(object sender, EventArgs e)
{
    var ucCount = panelItems.Controls.Count;
    var ucLocation = new Point(0, 0);

    var shipmentControl = new AmazonFBAShipmentControl(inventoryRepository);
    shipmentControl.Location = ucLocation;

    panelItems.Controls.Add(shipmentControl);

}