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		private void cmdProcess_Click(object sender, EventArgs e) {
			msg(new String('=', 40) + "[Process started]");
			FileInfo[] fia = GetFileList();
			msg("{0:N0} file found, totally.", fia.Length);

			var l = fia.Select(
				f => new
				{
					FileName = f.FullName,
					FileHash = Encoding.UTF8.GetString(
						(new SHA1Managed()).ComputeHash(
							new FileStream(
								f.FullName,
								FileMode.Open,
								FileAccess.Read
							)
						)
					)
				}
			)
			.GroupBy(f => f.FileHash)
			.Select(g => new { FileHash = g.Key, Files = g.Select(z => z.FileName) })
			.Select(f => f.Files.First());
			//.ToList();

			msg("{0:N0} unique files found.", l.Count());

			msg(new String('=', 40) + "[Process finished]");
		}