public static void processElements()
		{
			Excel.Worksheet sheet = (Excel.Worksheet)_book.Worksheets.get_Item("Справочник");

			Char[] charsToTrim = { ' ', '.' };
			for (int row = 2; row <= 796; row++)
			{
				Excel.Range range = sheet.get_Range("A" + row, "F" + row);
				Object[,] data = (Object[,])range.Value2;

				String name = Convert.ToString(data[1, 2]).Trim();

				try
				{
					element el = _db.elements.SingleOrDefault(e => e.name == name);

					if (el == null)
					{
						int type_id = getTypeId(Convert.ToString(data[1, 6]).Trim(charsToTrim));
						int unit_id = getUnitId(Convert.ToString(data[1, 4]).Trim(charsToTrim));

						el = new element
						{
							name = name,
							description = Convert.ToString(data[1, 3]).Trim(),
							count = 0,
							type_id = type_id,
							unit_id = unit_id,
							old_id = Convert.ToInt32(data[1, 1])
						};

						_db.elements.InsertOnSubmit(el);
					}
				}
				catch (System.InvalidOperationException)
				{
					Console.WriteLine("Element with name '{0}' exists multiple times", name);
				}
			}
			_db.SubmitChanges();

			Console.WriteLine("Element import complete");
		}