title: Get visible lines in Scintilla.NET component
body: <p>How can I get the first visible (top) and last visible (bottom) lines number for Scintilla component in C#? For example, if I scroll the text and I am able to see lines 5-41 (no folding, it is the number of lines which are shown by the component at the moment; the rest, you have to scroll to them), how do I get those numbers programatically? </p>