static class BookVariables
        {
            public static string BookName ="";

            public static string BookGenre = "";
            public static string BookAuthor = "";
            public static char Hallway = '\0';
            public static int BookClass = 3;
            public static char shelf = '\0';
            public static int CopiesNo = 0;
            public static string ISBN = "";

            public static void clear()
            {
                BookGenre = "";
                BookName = "";
                BookAuthor = "";
                Hallway = '\0';
                BookClass = 3;
                shelf = '\0';
                CopiesNo = 0;
                ISBN = "";


            }
        }

private void Save_Click_1(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=DESKTOP-FH9M09N\\ANANSQLSERVER;Initial Catalog=UniLibrary;Integrated Security=True");
            SqlCommand sqlCommand = new SqlCommand("insert into Book Values('" +1 + "','" + BookVariables.BookName
                + "','" + BookVariables.BookAuthor + "','"+BookVariables.BookGenre + "','"+BookVariables.BookClass + "','"
                +BookVariables.shelf + "','"+BookVariables.Hallway + "','"+BookVariables.ISBN + "','"+
                BookVariables.CopiesNo+"')",con);
            sqlCommand.Connection = con;
            con.Open();
            sqlCommand.ExecuteNonQuery();
            con.Close();
        }