C#

int LastRow = my_table3.Rows.Count;
            //Joining year and month to create date format
            my_table3.Columns.Add("تاریخ");
            my_table3.Rows[0][35] = "تاریخ";
            for (int i = 1; i < LastRow; i++)
            {
                my_table3.Rows[i][35] = string.Join("/", my_table3.Rows[i][19], my_table3.Rows[i][20]);
            }

            //Adding checked farm items into a list
            var check_box = new List<string>();
            foreach (BarItem c in ribbonControl1.Items)
            {
                if (c is BarToggleSwitchItem tg)
                {
                    if (tg.Checked)
                    {
                        check_box.Add(tg.Description);
                    }
                }
            }

            //Let's keep track of every value seen as we go through the rows

            var valuesSeen = new HashSet<string>();
            //Rows marked for deletion
            var duplicateRows = new List<int>();

            column_select.EditValue = "E";
            string selcolumn = (string)column_select.EditValue;

            int column_index = worksheet.Columns[selcolumn].Index;
            for (int i = 0; i < LastRow; i++)
            {
                string cellValue = my_table3.Rows[i][column_index].ToString();
                //Returns false if the value already exists
                if (valuesSeen.Add(cellValue) == false)
                {
                    //Mark this row for deletion since we've seen the value before
                    duplicateRows.Add(i);
                }
            }

            //Delete all marked rows only after we're done identifying them.
            for (int i = duplicateRows.Count - 1; i >= 0; i--)
            {
                int index = duplicateRows[i];
                my_table3.Rows[index].Delete();
                //Deleted rows get emty space in table, so we neeed to delete cpmpletely: 
                my_table3.AcceptChanges();
            }
            LastRow = my_table3.Rows.Count;
            var ToDelete = new List<int>();
            for (int i = 1; i < LastRow; i++)
            {
                //Comparing dates
                string one = FromDate.EditValue.ToString();
                string two = ToDate.EditValue.ToString();
                string three = my_table3.Rows[i][35].ToString();
                DateTime dOne = GetDate(one);
                DateTime dTwo = GetDate(two);
                DateTime dThree = GetDate(three);
                bool answer = dThree >= dOne && dThree <= dTwo;

                string cellValue = my_table3.Rows[i][10].ToString();
                string cellvalue2 = my_table3.Rows[i][9].ToString();

                for (int k = 0; k < check_box.Count; k++)
                {
                    if (cellValue != "خاتمه یافته" || cellvalue2 != "تعمیراتی" || answer == false || my_table3.Rows[i][14].ToString() != check_box[k].ToString())
                    {
                        ToDelete.Add(i);
                    }
                }
            }
            for (int i = ToDelete.Count - 1; i >= 0; i--)
            {
                int index = ToDelete[i];
                my_table3.Rows[index].Delete();
                //Deleted rows get empty space in table, so we need to delete completely: 
                my_table3.AcceptChanges();
            }

@model Commands.Models.ViewButtonText
<input type="submit" name="submit" value="@Model.ButtonText">
<input type="submit" name="submit" value="Cancel" />

<pre>public static Boolean KeepGoing = true;
        public static List<Book> bookList = new List<Book>();
      
        private static readonly String INPUT_ERROR_MESSAGE = "Please only enter NUMBERS!";
        private static readonly String INVALID_CHOICE = "INVALID CHOICE ENTERED!";
        private static readonly String SEARCH_MESSAGE = "Searching for book,please wait......";
        private static Random RandomObject = new Random();
        
        
      

        public static void WelcomeMessage()
        {
            Console.WriteLine("********************");
            Console.WriteLine("*       Cork       *");
            Console.WriteLine("*      Library     *");
            Console.WriteLine("********************");
        }

        private static void MenuHeader()
        {
            Console.WriteLine("********************");
            Console.WriteLine("*       Menu       *");
            Console.WriteLine("*      Options     *");
            Console.WriteLine("********************");
        }

        private static void MenuOptions()
        {
            Console.WriteLine("1.) Add Book.             ");
            Console.WriteLine("2.) Search for Book.      ");
            Console.WriteLine("3.) Delete Book.          ");
            Console.WriteLine("4.) Display all Book.     ");
            Console.WriteLine("0.) Exit.                 ");
        }

        public static void GetUserInput()
        {
            int choice;
            MenuHeader();
            do
            {
                MenuOptions();
                Console.WriteLine(">");
                choice = 0;
                while (!int.TryParse(Console.ReadLine(), out choice))
                {
                    Console.WriteLine(INPUT_ERROR_MESSAGE);
                }
                PickChoice(choice);
            } while (choice != 0);
        }

        private static void PickChoice(int choice)
        {
            switch (choice)
            {
                case 1:
                    AddBook addBook = new AddBook();
                    addBook.EnterBookInfo();
                    break;

                case 2:
                    Search search = new Search();
                    search.SearchForBook();
                    AddBook();
                    break;

                case 3:
                    break;

                case 4:
                    //PrintListOfBooks();
                    
                    AddBook addBook1 = new AddBook();
                    AddBook();
                    addBook1.PrintListOfBooks();
                    break;

                case 0:
                    Exit exit = new Exit();
                    exit.Exit_Application();
                    break;

                default:
                    Console.WriteLine(INVALID_CHOICE);
                    break;
            }
        }

        public static void MakeTheComputerSleep()
        {
            int number = RandomObject.Next(10) + 1;
            Console.WriteLine("Searching for Book.......");
            Thread.Sleep(number * 1000);
        }

        public static void AddBook()
        {
            Book book1 = new Book("Neverwhere", "Neil Gaimen", 1, "aaaaa");
            bookList.Add(book1);
        }