Error CS0201 | Need Help

SonOfTheKingsman

The following lines of code are having this error: [error CS0201: Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement]

Does anyone know why?

if (!foundRes)

{

ResItem newRes = new ResItem();

newRes.horizontal == Screen.width;

newRes.vertical == Screen.height;

resolutions.Add(newRes);

selectedResolution = resolutions.Count - 1;

UpdateResLabel();

}