Select either Doted line or full line of the same Layer in AUTOCAD?

I got the CAD file and want to find the length of the line of specific layer.

The image attached contain the red line one dotted and other straight and full.

The dotted represent the existing and full & straight represent the new & Proposed.

By using the select similar I got the both line selected because both have of same layer (I think).

Is it possible to use any command in autoCAD which select only doted line or full line at a time. (because In file there are about 20 groups of these line).

You could try the FILTER command. You should be able to specify linetype as your filter criteria.

If you start SELECTSIMILAR from the Command line, there will be an option for SEttings. After created the selection set, you can use something like TLEN lisp to find the total length of all selected objects. Alternately, while the objects are selected, you can use the ISOLATE command to hide everything not selected until you're done working with a specific selection, and then use the ISOLATE command again (UNISOLATE) to make everything visible again.

(BTW, QSELECT could be used to do the same thing.)