Android Question Delete certain line in text file

Dim l As List = File.ReadList("filePath", "filename")    'put each line of the text file into a list
l.RemoveAt(l.Size-1)                                    'remove the last line

l.Add("new line text here")                                   'add your new line
File.WriteList("savePath", "filename", l)                'save the list to a new file (if necessary)

dim str as string = File.ReadString (Dir, FileName)
str = str.replace(str.substring(str.LastIndexOf(crlf)), crlf & "New value")