These lines are getting displayed with a bold vertical line in place of - in Textpad. When I am trying to type this bold vertical bar using key board, I can not do that. Only thin vertical bar is being typed. How can I know, what keys can type this vertical bar ?
Is there a way to find that out from Textpad document (By checking properties or something) ? In future, for any other character, can I check it by myself using some properties or do I have to post it again over here ?
That character has code hex 96 (decimal 150). If you position your mouse pointer over it without clicking, TextPad will display that code. In Windows 1252 and similar code pages this is "en dash".
This is a font issue, not an editor issue. Perhaps you're using Courier, which on my machibne has no glyph for that character. Try a different font.
You can enter this character on a Windows machine my switching on Num Lock and holding down the <Alt> key while typing 0 1 5 0 on the numeric keypad.