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I came across this piece of code today:
File.SetAttributes(excelFileName, File.GetAttributes(excelFileName) & ~
(FileAttributes.Archive | FileAttributes.ReadOnly));
Never seen it before. Anyone know?
http://msdn.microsoft.com/en-us/library/d2bd4x66.aspx
The ~ operator performs a bitwise complement operation on its operand, which has the effect of reversing each bit. Bitwise complement operators are predefined for int, uint, long, and ulong.