Convergent Validity

    CR > (AVE)
    AVE > 0.5

Discriminant Validity

    MSV < AVE
    ASV < AVE

Using factor loadings there are two formulas.
Look at this please. Is an excel file where you fill only the factor loadings
http://www.watoowatoo.net/sem/sem_stats.xls

Confirmatory Factor Analysis (Cfa) for Testing Validity And Reliability Instrument in
the Study of Education
http://www.ajbasweb.com/ajbas/2011/December-2011/1098-1103.pdf