How do I Go To Original Form when I receive an Error? - vb.net

Question

I am working to create it so when the application cannot find the file that the user selected, it will go back to the original form (where it was selected - frmLetters). So I am using a Try, Catch block but it just continues down the sub procedure.
I need it to stop the current sub procedure and go back to the original form for the user to choose the correct file. This is the code I am trying:
Try
objExcelBook = objExcelApp.Workbooks.Open(sInputExcelDataFile,, True)
Catch ex As Exception
MsgBox("Are You Sure you chose the correct file path?")
Me.Close()
frmLetters.Close()
frmLetters.Show()
End Try
I am much more familiar with VBA but the syntax is similar in most cases. I know try, Catch doesn't exist in VBA but if I wanted to return to the original form it is very simple.
Just so you know the reason I am closing frmLetters before opening it, is at this point it is only hidden.

Answer 1

First of all Create this method in your MDIParent. This should be the way that you display the form inside the MDI Parent. You should display your original form this way as well instead of using show.
Public Sub DisplaySubForm(ByVal f As Form)
For Each currentForm As Form In Me.MdiChildren
If f.GetType Is currentForm.GetType Then
currentForm.Activate()
Return
End If
Next
f.MdiParent = Me
f.Show()
f.WindowState = FormWindowState.Normal
f.BringToFront()
End Sub
To Return the form, you simply can do like (you can do it on your form)
MDIParent1.DisplaySubForm(frmSomething)
To close the form, you use
me.dispose