小吳 VBQA 程式設計討論

Hi, friend
I have finished selecting the records by where condiction.i want to check whether rs.Field() is empty.
can you help me to express it!
thanks a lot!
grs.MoveFirst
MSChart1.Column = 3
　MSChart1.ColumnLabel = "ESTABFAIL"
　For m = 1 To NumPoints
　　MSChart1.Row = m
　　'there is wrong with below sentence
　　If grs.Fields(3) = Null Then
　　　MSChart1.Data = 0
　　Else
　　 MSChart1.Data = grs.Fields(3)
　　End If
　　grs.MoveNext
　Next m