It depends on exactly what you are getting: if it's the bytes 4d, 79, 4e, ... then it's fairly simple:
Dim s As String = System.Text.Encoding.UTF8.GetString(_dataBytes)
If it's a string: "4d-79-4e-61-6d-65-31-00-00-00" then it's more complex: first convert that to bytes, then convert the bytes to a string:
Public Shared Function GetBytes(value As String) As Byte()
Return Array.ConvertAll(value.Split("-"C), Function(s) Byte.Parse(s, System.Globalization.NumberStyles.HexNumber))
End Function