Check if a drive exists

I'm using the following code to check if a file has been defined.

HTML Code:

---

If txtGradeObs.Text = "" Or Dir(txtGradeObs.Text) = "" Then
    MsgBox("Specify the Grade job of Obstructions", vbExclamation, MsgBoxTitle)
    Exit Sub
End If

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I'm getting an error if the drive does not exist. I don't think this was a problem in VB6.
I'm getting an IO exception - bad file name or number.
How can I get this to work?
Thanks

There are various ways to avoid or handle that error.

Given the circumstances, I suspect you would like to show the same MsgBox if the drive does not exist, in which case you can use a simple method:

Code:

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On Error Resume Next
If txtGradeObs.Text = "" Or Dir(txtGradeObs.Text) = "" Then
    MsgBox("Specify the Grade job of Obstructions", vbExclamation, MsgBoxTitle)
    Exit Sub
End If
On Error GoTo 0  '(or if you had a different "on error" line before, repeat it here)

---

This will cause the MsgBox to show (and the Exit Sub) if either of the conditions are true, or any error occurs during the Dir.