VBA - Open a UserForm by clicking anywhere in a specific column - vba

Question

I would like to build a makro in VBA which opens a UserForm when I click in a cell in a specific column, for more details look here.
With this code (from Mr.Burns):
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Selection.Count = 1 Then
If Not Intersect(Target, Range("A1")) Is Nothing Then
'name of userform .Show
End If
End If
End Sub
I was able to open the UserForm by clicking in the cell A1, but not by clicking in any cell inside the column A.
I tried to solve this problem with this code:
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Selection.Count = 1 Then
Dim check As Boolean
check = True
If check Then
Dim i As Long
For i = 1 To 100000
If Not Intersect(Target, Range("A" & i)) Is Nothing Then
UserForm1.Show
check = False
End If
Next
End If
End If
End Sub
It actually works fine, but it is very slow, is there any better possibility to solve this?

Answer 1

To display the form when a cell is selected in column A:
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
' if target is one cell and in column A
If Target.Columns.count = 1 And Target.Rows.count = 1 And Target.Column = 1 Then
UserForm1.Show
End If
End Sub

Answer 2

You can use .count and .column property together with AND and it will become so much simple and fast. Following code triggers pop-up if u click in column A on active-sheet
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
On Error GoTo errorhandler
If Target.Count = 1 And Target.Column = 1 Then '.count to check if only one cell is selected and .column to check if it is a first column
'UserForm1.Show
'Do whatever you want to do here like opening User form
MsgBox "You clicked in column A"
End If
errorhandler:
End Sub