User input from Textbox or CommonDialog

I have provided both Textbox and CommonDialog for the user to enter a filename. So far I just managed to get the user to click a button to call the CommonDialog control and when a file is selected, then the filename will appear in the Textbox. But if the user straight away write down the filename in the Textbox, then there will be an error.
How can I make the user to enter the filename either using the Textbox or the CommonDialog control?

Below is the coding:
Private Sub Button1_Click()

CommonDialog1.showOpen
txtFilename = CommonDialog1.Filename
InputFile = txtFilename

End Sub
suhaniAsked:
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faintforyouConnect With a Mentor Commented:
I think that the error you have encountered is perhaps because
the text in the textbox that the user
had typed is not really a filename

Then you can use the method below to
ensure that the user have typed in
a correct filename.

Add a button on your form named
btnConfirm

Private sub btnConfirm_Click()
  On Error Goto Err_Handler
     FileLen(txtFilename.text)
     'if the file did not exist
     'there will be a error
     
  Exit Sub
Err_Handler:
   Msgbox "You have not input a valid _
           File Name.Please check it."

   txtFilename.Text="" 'or any you like

End Sub
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fibdevCommented:
Private Sub Button1_Click()
  Dim InputFile as String
  CommonDialog1.filter = "All Files (*.*)|*.*"
  CommonDialog1.showOpen
txtFilename.text = CommonDialog1.Filename
InputFile = txtFilename.text

End Sub
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fibdevCommented:
Just in case, try this:

Private Sub Button1_Click()

  Dim InputFile as String
  CommonDialog1.filter = "All Files (*.*)|*.*"
  CommonDialog1.showOpen
    If CommonDialog1.filename <> null then
     txtFilename.text = CommonDialog1.Filename
    end if
InputFile = txtFilename.text

End Sub


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