I am calling showdialog to show a form using the following code:

Private sub miAdd_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles miAdd.Click
   Cursor.Current = Cursors.WaitCursor
   AddEditForm = New frmAddEdit
   AddEditForm.NewPatient = True
   AddEditForm.Searching = False
   AddEditForm.ShowDialog()
   MessageBox.Show("A")
   LoadList()
   Cursor.Current = Cursors.Default
End Sub

On my AddEditForm, in my Return Menu Item I have:

Private Sub miReturn_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles miReturn.Click
   If (NewEntry) And (Not Save1) Then
       InsertData(sender, e)
   End If
   Try
       MessageBox.Show("1")
       frmAddEdit_Save(sender, e)
   Catch ex As Exception
       MessageBox.Show(ex.ToString)
   End Try
   MessageBox.Show("C")
   Me.Close()
End Sub

I get the messagebox.show for 1 and C, but get an argumentnullexception
after the messagebox.show("C") and do not get the Messagebox.show("A").
Being new to this, I'm sure that it is a programming error but have run out
of places to look. Any ideas would be greatly appreciated.

TIA
Scott