/// <summary>
        /// Adds 1 to all elements with the same prefix and bigger number than the one on selection
        /// </summary>
        public static void SetElementsUpStream()
        {
            tools.AddToSelection();
            if (tools.selectedElement != null)
            {
                //Get the selected element
                Element element = tools.selectedElement;

                //Get Shared parameter with the Prefix and number
                var startNumber = getNumber(element);

                //Get Number and prefix of the selected element
                var limit = GetNumberAndPrexif(startNumber);

                //Get filter with all the MEP categories
                LogicalOrFilter logicalOrFilter = new LogicalOrFilter(MEPCategories.listCat());

                //Get all MEP elements in active view
                var collector = new FilteredElementCollector(doc, doc.ActiveView.Id).WherePasses(logicalOrFilter).WhereElementIsNotElementType();



                if (limit != null)
                {
                    foreach (var item in collector.ToElements())
                    {
                        var number = getNumber(item);
                        if (number != null)
                        {
                            if (number.Contains(limit.Item1))
                            {
                                var itemNumber = GetNumberAndPrexif(number);
                                if (itemNumber != null)
                                {
                                    var limitNumber   = int.Parse(limit.Item2);
                                    var currentNumber = int.Parse(itemNumber.Item2);

                                    if (limitNumber < currentNumber)
                                    {
                                        var newnumber = createNumbering(itemNumber.Item1, MainForm.Separator, currentNumber + 1, itemNumber.Item2.Count());

                                        AssingPartNumber(item, newnumber);
                                    }
                                }
                            }
                        }
                    }
                }
            }

            else
            {
                MessageBox.Show("Please select an element");
            }
        }
        /// <summary>
        /// Subtract 1 to all elements with the same prefix and bigger number than the one on selection
        /// </summary>
        internal static void SetElementsDnStream()
        {
            tools.AddToSelection();
            if (tools.selectedElement != null)
            {
                Element element = tools.selectedElement;

                LogicalOrFilter logicalOrFilter = new LogicalOrFilter(MEPCategories.listCat());

                var collector   = new FilteredElementCollector(doc, doc.ActiveView.Id).WherePasses(logicalOrFilter).WhereElementIsNotElementType();
                var startNumber = getNumber(element);
                var limit       = GetNumberAndPrexif(startNumber);
                if (limit != null)
                {
                    foreach (var item in collector.ToElements())
                    {
                        var number = getNumber(item);
                        if (number != null)
                        {
                            if (number.Contains(limit.Item1))
                            {
                                var itemNumber = GetNumberAndPrexif(number);
                                if (itemNumber != null)
                                {
                                    var limitNumber   = int.Parse(limit.Item2);
                                    var currentNumber = int.Parse(itemNumber.Item2);

                                    if (limitNumber < currentNumber)
                                    {
                                        var newnumber = createNumbering(itemNumber.Item1, MainForm.Separator, currentNumber - 1, itemNumber.Item2.Count());

                                        AssingPartNumber(item, newnumber);
                                    }
                                }
                            }
                        }
                    }
                }
            }

            else
            {
                MessageBox.Show("Please select an element");
            }
        }