After breaking my head over the wall, I actually found a way. I will post it here, so maybe somebody with the similar problem will find solution for himself.
That is my button that located in the ListView
<asp:Button ID="orderbook" runat="server" CommandName="order" CommandArgument="ordernow" OnCommand="Order_Command" Text="order now" />
And in code behind i added
protected void Order_Command(object sender, CommandEventArgs e)
{
if (e.CommandName == "order")
{
testLabel.Text = e.CommandName.ToString();
}
}
And now when i click on the button, it catches the event.