How to draw / edit / delete lines on the same form?

Hi sir/madame,

I want to draw / edit / delete lines on the same form. I have already found some interesting code to draw lines on a grid control. ( Thanks Mr.Thorsten for the help )

Link: MSDN Link for my previous thread

So, I want to improve this. What I want is to edit the lines I draw &  I want to delete them as well when I need. 

Can anyone please give me a help to  do this.?

Thanks in advance.