A. Shishkanov

public  IEnumerable<string> SafeEnumerateFiles(string path, string searchPattern, SearchOption searchOption)
		{

			Stack<string> dirs = new Stack<string>();
			dirs.Push(path);

			while (dirs.Count > 0)
			{
				string currentDirPath = dirs.Pop();
				if (searchOption == SearchOption.AllDirectories)
				{
					try
					{
						string[] subDirs = Directory.GetDirectories(currentDirPath);
						foreach (string subDirPath in subDirs)
						{

							if ((File.GetAttributes(subDirPath) & (FileAttributes.Hidden | FileAttributes.System)) != (FileAttributes.Hidden | FileAttributes.System))
							{
								dirs.Push(subDirPath);
							}
						}
					}
					catch (UnauthorizedAccessException)
					{
						continue;
					}
					catch (DirectoryNotFoundException)
					{
						continue;
					}
				}

				string[] files = null;
				try
				{
					files = Directory.GetFiles(currentDirPath, searchPattern);
				}
				catch (UnauthorizedAccessException)
				{
					continue;
				}
				catch (DirectoryNotFoundException)
				{
					continue;
				}

				foreach (string filePath in files)
				{
					yield return filePath;
				}
			}
		}