Question: I have several tableviews, one of them uses coredata and others get data from a json api. In my tableview which gets data from coredata, when I launch the app there is a cell, but my coredata is empty. Cell disappears when I reload the table. 
How am I going to remove that cell?

Answer: 
```
Private ImBusy As Boolean = False

Private Sub LookBusyForTheBoss()
    Me.UseWaitCursor = True
    Me.Cursor = Cursors.WaitCursor
    Me.Enabled = False
    ProgressBar1.UseWaitCursor = False
    ProgressBar1.Style = ProgressBarStyle.Marquee

    ImBusy = True
End Sub

Private Sub Form77_FormClosing(...) Handles Me.FormClosing
    If ImBusy Then e.Cancel = True
End Sub

Private Sub OkHeIsGone()
    Me.UseWaitCursor = False
    Me.Cursor = Cursors.Default
    Me.Enabled = True

    ImBusy = False
End Sub

```
Disabling the close button would be bad taste in the extreme. Fix your application so that the calculation can be interrupted.