It is not possible to remove the "x" from the top right corner although you can disable it. Whether you display a prompt to the user or not is up to you.
Uaing the QueryClose event allows you to intercept the message to close the userform before it is actually closed. If you set the Cancel paramater to True, then the userform will not be closed.
This means the userform has been closed by the user pressing the top right x.
Private Sub UserForm_QueryClose(Cancel as integer, CloseMode as integer)
If CloseMode = vbQueryClose.vbFormControlMenu Then
MsgBox "Cannot close the userform !!"
Cancel = True
This means the userform has been closed by code
If CloseMode = vbQueryClose.vbFormCode Then
Cancel = True
Removing the Close button
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName As String, ByVal lpWindowName As String) As Long
'current window state
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
(ByVal hwnd As Long, ByVal nIndex As Long) As Long
'new window style
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Const GWL_STYLE = -16
Const WS_SYSMENU = &H80000
Public Sub RemoveCloseButton(oUserForm As MSForms.UserForm)
Dim hwnd As Long
Dim lStyle As Long
hwnd = FindWindow("ThunderXFrame"), oUserForm.Caption)
lStyle = GetWindowLong(hwnd, GWL_STYE)
SetWindowLong hwnd, GWL_STYLE, (lStyle And Not WS_SYSMENU)
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