excal vba problem: range

I have some coding as below, but i just don't know how to continue it:

dim rangeA as Range
dim sht as Worksheet
set sht=ActiveSheet
if aaa+1<>bbb then
       set rangeA = Range(sht.Cells(aaa+1,1), Cells(bbb-1,sht.UsedRange.Columns.Count))
end if

If <expression here!> Then
      msgbox "rangeA is valid"
      <more steps here....>
     msgbox "rangeA is not valid"
End If

how i gonna write the code in the <expression here!> to determine whether the "rangeA" is a valid range or not. Meaning if aaa=2 and bbb=3, from the coding, we know that rangeA will be nothing. In the second "if-statement", i will check whether the rangeA is valid or not, if valid, i will do some manipulation on it, if not, i will continue to the next step. how to write it in code? hope somebody can help me on this a.s.s.p. I need it urgently. thanks!

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byundtMechanical EngineerCommented:
Hi marrydale,
Try something like this:

Sub RangeTester()
Dim rangeA As Range
Dim sht As Worksheet
Set sht = ActiveSheet
Dim aaa As Long, bbb As Long
aaa = InputBox("aaa")
bbb = InputBox("bbb")
If aaa + 1 <> bbb Then
       Set rangeA = Range(sht.Cells(aaa + 1, 1), Cells(bbb - 1, sht.UsedRange.Columns.Count))
End If

If IsError(rangeA) Or rangeA Is Nothing Then
     MsgBox "rangeA is not valid"
    MsgBox "rangeA is valid"
    '<more steps here....>
End If
End Sub



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marrydaleAuthor Commented:
thanks, it help me a lot!

one small portion of question i forgot to ask just now, the rangeA actually is in a for-loop. so i have to reset it into nothing after it have run one loop. how to code it? meaning how to reset it into nothing?

byundtMechanical EngineerCommented:
Set rangeA = Nothing
byundtMechanical EngineerCommented:
Thanks for the grade!
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