The following code.
XRect rc = new XRect();
rc.String = "0 0 200 100";
Response.Write($"Rect = {rc}");
Response.Write("<br>");
rc.Inset(10, 20);
Response.Write("Inset = " + rc.String);
Dim rc As New XRect()
rc.String = "0 0 200 100"
Response.Write($"Rect = {rc}")
Response.Write("<br>")
rc.Inset(10, 20)
Response.Write("Inset = " + rc.String)
Produces the following output.