I am having problem with attached file. It is filling cells while selecting "September" month from combo box. Please see it and help me to fix this problem.
That was bizarre, as the code looked, at a quick glance, to be fine
I would change your code to that as per below:
Code:
Private Sub ComboBox1_Change()
Dim month As String
Application.ScreenUpdating = False
Application.EnableEvents = False
month = ComboBox1.Value
Sheet1.Columns("C:BV").EntireColumn.Hidden = True
Select Case month
Case Is = "Show All"
Sheet1.Columns("c:bv").EntireColumn.Hidden = False
Case Is = "January"
Sheet1.Columns("C:H").EntireColumn.Hidden = False
Case Is = "February"
Sheet1.Columns("I:N").EntireColumn.Hidden = False
Case Is = "March"
Sheet1.Columns("O:T").EntireColumn.Hidden = False
Case Is = "April"
Sheet1.Columns("U:Z").EntireColumn.Hidden = False
Case Is = "May"
Sheet1.Columns("aa:af").EntireColumn.Hidden = False
Case Is = "June"
Sheet1.Columns("ag:al").EntireColumn.Hidden = False
Case Is = "July"
Sheet1.Columns("am:ar").EntireColumn.Hidden = False
Case Is = "August"
Sheet1.Columns("as:ax").EntireColumn.Hidden = False
Case Is = "September"
Sheet1.Columns("ay:bd").EntireColumn.Hidden = False
Case Is = "October"
Sheet1.Columns("be:bj").EntireColumn.Hidden = False
Case Is = "November"
Sheet1.Columns("bk:bp").EntireColumn.Hidden = False
Case Is = "December"
Sheet1.Columns("bq:bv").EntireColumn.Hidden = False
End Select
Application.ScreenUpdating = True
Application.EnableEvents = True
End Sub