hello , can you plz tell me if there is a way to auto connect two lines?
Yes, there is. Several ways, in fact. Share a bit more about what you are working, and we can suggest a workflow or two that might achieve what you are after. 
i have this situation for example and i want to connect the lines…
Here, I share a few options available to accomplish this. 
(click images to view larger version)
Draw connecting segment using ‘Pen / Draw Lines’ tool
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‘Node Edit’ tool ‘Extend’
‘Close selected paths with tolerance’
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