Microsoft.Build.Tasks.Copy.HasFileChanged C# (CSharp) Method

		bool HasFileChanged (string source, string dest)
		{
			if (!File.Exists (dest))
				return true;

			FileInfo sourceInfo = new FileInfo (source);
			FileInfo destinationInfo = new FileInfo (dest);

			return !(sourceInfo.Length == destinationInfo.Length &&
					File.GetLastWriteTime(source) <= File.GetLastWriteTime (dest));
		}