Chemistry question...detection of ppm with different dilution scenarios.?

If i dilute something in 100 ml of water and get a certain ppm let us say 100, what would the ppm be if I instead diluted it in 200 ml rather than a 100ml ? what would my ppm me? would it just be half of the ppm that I detected when diluting with a 100 ml? Could I used the C1V1=C2V2?