VB.NET Debug Error

I get this error "Illegal characters in path" for this code:

Dim strm As System开发者_开发技巧.IO.FileStream
strm = New System.IO.FileStream(filepath, IO.FileMode.Open, IO.FileAccess.Read)

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Your file path might contain an invalid character that Windows file system not allow to use it like \ / : * ? " < > |