Worksheet change event with multiple column cell value change

Here is my plan:

For Column A, if cell value > 1, prompt MsgBox, then go to check Column B.
For Column B, if cell value > 2, prompt MsgBox, then go to check Column C.
For Column C, if cell value > 20, prompt MsgBox, End Sub

To test this code:

First of all, I insert value of 0, 1, 21 into any blank cell in the worksheet. (Eg: D2, E2, F2)
Then I copy and paste value of D2, E2, F2 into A2, B2, C2.
However, it repeats the Column A & B Msgbox although the values are not exceeded.
Byright, it should only prompt Column C MsgBox since the value is >20.

The code is working perfectly if I key in value one by one into A2, B2, C2.
But it is not working for copy and paste method.
Somehow it will repeats previous column MsgBox.

Please help me find errors in my code. Thanks for helping!

Here is my code:

Private Sub Worksheet_Change(ByVal Target As Range)

Dim aCell As Range
Dim bCell As Range
Dim cCell As Range

Set aCell = Range("A2:A10")
Set bCell = Range("B2:B10")
Set cCell = Range("C2:C10")

On Error GoTo Whoa

Application.EnableEvents = False

If Not Intersect(Target, aCell) Is Nothing Then
For Each aCell In Target
If aCell.Value > 1 Then
If MsgBox("A Temperature Exceeded", vbExclamation, "Warning") = vbOK Then GoTo Line1
End If
Next
End If

Line1:
If Not Intersect(Target, bCell) Is Nothing Then
For Each bCell In Target
If bCell.Value > 2 Then
If MsgBox("B Temperature Exceeded", vbExclamation, "Warning") = vbOK Then GoTo Line2
End If
Next
End If

Line2:
If Not Intersect(Target, cCell) Is Nothing Then
For Each cCell In Target
If cCell.Value > 20 Then
If MsgBox("C Temperature Exceeded", vbExclamation, "Warning") = vbOK Then
End If
End If
Next
End If

Letscontinue:
Application.EnableEvents = True
Exit Sub
Whoa:
MsgBox Err.Description
Resume Letscontinue
End Sub

Ok, I have tried both of your VBA Codes.

When I copy & paste 2 rows of cells into A1:C2, where all the values are out of condition.

Example:

Column A Column B Column C
Row 1: 100 100 100
Row 2: 100 100 100

The first code will only prompt MsgBox 3 times. (Maybe is because of you have added "Then Exit For" to "For Each" function, therefore it exit "for each" function when the condition meets)
The second code will prompt MsgBox 6 times in total, for each cell value which are out of the condition.

For my application, I just want to prompt MsgBox only 1 time for each column, to notify me which column is having error, then I can focus checking data on that particular column. Since I have to copy and paste a huge amount of data into this worksheet, if there are many cell value which are out of range, then there will be a lot of MsgBox prompted. So I will be using your first code.

Thanks for your help!