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How to: Validate File Names and Paths in Visual Basic

This example returns a Boolean value that indicates whether a string represents a file name or path. The validation checks if the name contains characters that are not allowed by the file system.

Function IsValidFileNameOrPath(ByVal name As String) As Boolean 
    ' Determines if the name is Nothing. 
    If name Is Nothing Then 
        Return False 
    End If 

    ' Determines if there are bad characters in the name. 
    For Each badChar As Char In System.IO.Path.GetInvalidPathChars
        If InStr(name, badChar) > 0 Then 
            Return False 
        End If 
    Next 

    ' The name passes basic validation. 
    Return True 
End Function

This example does not check if the name has incorrectly placed colons, or directories with no name, or if the length of the name exceeds the system-defined maximum length. It also does not check if the application has permission to access the file-system resource with the specified name.

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