FERPA does not permit the public disclosure of personally identifiable student information. Posting grades in the manner you have described would be a violation. It is, however, permissible to post student grades if you use the methods approved by the university. For example, you may use the Posting-ID that is provided on your class rosters. Additional information is available in the Academic Affairs Policy Manual, ACD 304-03, https://www.asu.edu/aad/manuals/policyarchives/ACD/July2009/acd304-03.html.