How to print/append row index number on each line in a file in Powershell

Question

sapmple.txt as below

row1col1||col2||col2||col3
row2col1||col2||col2||col3
row3col1||col2||col2||col3

expected

0||row1col1||col2||col2||col3
1||row2col1||col2||col2||col3
2||row3col1||col2||col2||col3

I coded like

get-content "C:\sample.txt" | foreach { "[|][|]" + $_ } | foreach { Index  + $_ } | set-content "C:\sample1.txt"

calling the pipe and then respective index, but not working.

Can you please help.

Answer 1

Another thought:

% { $i = 0 } { "$i||$_" ; $i++ }