C#

Rectangle r1 = Screen.PrimaryScreen.Bounds;
Rectangle r2 = this.Bounds;
Rectangle r3 = this.ClientRectangle;
Rectangle r4 = this.DisplayRectangle;

Console.WriteLine($"screen {r1}\nform bounds {r2}\nform displayrect {r3}\nform clientrect {r2}");

public class B<T> where T : B<T>
{
    public void Foo(T) { }
    public void Bar() => Foo(this); // Not allowed - see below
}

public class C : B<C>
{
    public void Bar2() => Foo(this); // Allowed - T === C
}

public class D : B<C>
{
    public void Bar3() => Foo(this); // Not allowed - T === C, no conversion from D to C
    public void Bar4() => Bar(); // !!!
}

{
    string url = "https://www.google.com";

    Process proc = Process.Start(url);

    proc.WaitForInputIdle();
}

string url = "...?srn=216^&" + _ebayOrder.OrderNumber;

var psi = new ProcessStartInfo()
{
    FileName = "cmd",
    WindowStyle = ProcessWindowStyle.Hidden,
    UseShellExecute = false,
    CreateNoWindow = true,
    Arguments= "/c start \"" + url + "\"",
};

Process.Start(psi);

string url = "....?srn=216&" + _ebayOrder.OrderNumber;
Process.Start(url);

private void Link_MarketplaceOrder_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
    try
    {
        var url = "https://www.marketplace.com/sh/ord/details?srn=216^&orderid=" + _marketplaceOrder.OrderNumber;                 
        var psi = new ProcessStartInfo()
        {
            FileName = "cmd",
            WindowStyle = ProcessWindowStyle.Hidden,
            UseShellExecute = false,
            CreateNoWindow = true,
            Arguments= "/c start " + url
        };
        Process.Start(psi);
    }
    catch (Exception ex)
    {
        throw ex;
    }            
}