How to remove a single Attribute (e.g. ReadOnly) from a File?

Question

Let say, a file has the following attributes: ReadOnly, Hidden, Archived, System. How can I remove only one Attribute? (for example ReadOnly)

Answer 1

if ((oFileInfo.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
    oFileInfo.Attributes ^= FileAttributes.ReadOnly;