Data Controls :: Change GridView Row Color Based On Date In BoundField?

In my asp.net+vb we+access DB. i have a field named DOB which is date of birth. i displays the data in grid view whose DOB+90 is less than ot equl to current date

DOB+90<=now()

and it works currect. but when i try to used vb code to change the row colour as per data it works for this one.

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
If (e.Row.DataItem("DOR") <= Now()) Then
e.Row.ForeColor = Drawing.Color.Red
End If

But i want three diffrent conditions

1.  whose DOB=current month

2.  whose DOB comes in next month

3. whose DOB comes in month after next month

The font colour should be diffrent