Schreibschutz einer Datei setzen / entfernen

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/// <summary>
/// Sets the read only attribute.
/// </summary>
/// <param name="fullName">The full name.</param>
/// <param name="readOnly">if set to <c>true</c> [read only].</param>
private static void SetReadOnlyAttribute(string fullName, bool readOnly)
{
    FileInfo filePath = new FileInfo(fullName);
    FileAttributes attribute;
    if (readOnly)
        attribute = filePath.Attributes | FileAttributes.ReadOnly;
    else
        attribute = (FileAttributes) (filePath.Attributes - FileAttributes.ReadOnly);

    File.SetAttributes(filePath.FullName, attribute);
}