主题：cmd.commandtext总是报错，应该怎么写？

For Each r As Row In Tables("AAAAAFT").Rows
    Dim cmd As New SQLCommand
    cmd.C
    If r("unitname1") IsNot Nothing
        cmd.CommandText = "U PDATE {AAAAAFX} SET prepprice1 = r("prepprice1")*unitrate,prepprice2=r("prepprice2")*unitrate,prepprice3=r("prepprice3")*unitrate,prepprice4=r("prepprice4")*unitrate,prepprice5=r("prepprice5")*unitrate,prepprice6=r("prepprice6")*unitrate,memberprice1=r("memberprice1")*unitrate,memberprice2=r("memberprice2")*unitrate,memberprice3=r("memberprice3")*unitrate where wareid=r("selfid") And unitrownumber=1"
        cmd.ExecuteNonQuery()
    End If
    If r("unitname2") IsNot Nothing
        cmd.CommandText = "U PDATE {AAAAAFX} SET prepprice1 = r("prepprice1")*unitrate,prepprice2=r("prepprice2")*unitrate,prepprice3=r("prepprice3")*unitrate,prepprice4=r("prepprice4")*unitrate,prepprice5=r("prepprice5")*unitrate,prepprice6=r("prepprice6")*unitrate,memberprice1=r("memberprice1")*unitrate,memberprice2=r("memberprice2")*unitrate,memberprice3=r("memberprice3")*unitrate where wareid=r("selfid") And unitrownumber=2"
        cmd.ExecuteNonQuery()
    End If
Next

cmd.commandtext总是报错不让保存，应该怎么写？