Question

I would want to search up, down, and match case if possible. Even links to get me started would be appreciated.

Answer 1

Not sure about the up searching but as far as finding you can use something like this

int selStart = ControltoSearch.SelectionStart;
int selLength = ControltoSearch.SelectionLength;
int newLength = SearchFor.Length;

int newStart = searchIn.IndexOf(SearchFor, selStart + selLength, compareType);

ControltoSearch.SelectionStart = newStart >= 0 ? newStart : 0;
ControltoSearch.SelectionLength = newLength;
ControltoSearch.ScrollToCaret();
ControltoSearch.Focus();

return newStart;

For matched case you can use String.ToLowerInvariant() on both the search in text and the search for text otherwise String.Contains() is case sensitive

searchIn.ToLowerInvariant().Contains(SearchFor.ToLowerInvariant())