private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            //adiazei to panel
            panel1.Controls.Clear();

            arxiki ar = new arxiki();

            tixeo_lima(ar);//kali tin function tixeo_lima
            ar.Show();
            panel1.Controls.Add(ar);
        }
        public Formkentriki()
        {
            InitializeComponent();
            //adiazei to panel
            panel1.Controls.Clear();

            arxiki ar = new arxiki();

            ar.Show();
            panel1.Controls.Add(ar);
        }
        //kodikas emfanisis tixeon limaton{Rafail} stin arxiki
        public void tixeo_lima(arxiki ar)
        {
            Random rnd          = new Random();
            int    article_id_1 = rnd.Next(18, 601301);//18 mikrotero id 601301 megalitero
            int    article_id_2 = rnd.Next(18, 601301);
            int    article_id_3 = rnd.Next(18, 601301);



            OPENXMLTestingEntities1 article_tixeo = new OPENXMLTestingEntities1();


            //tixeo lima 1
            var get_article_tixeo       = article_tixeo.articles.Where(a => a.id == article_id_1).SingleOrDefault();
            var get_article_image_tixeo = article_tixeo.imagelinks.Where(a => a.il_from == article_id_1).First();

            ar.Label14.Text = get_article_tixeo.title;
            ar.Label15.Text = get_article_tixeo.kimeno;
            string get_article_image_tixeo_il_to = get_article_image_tixeo.il_to;                                                            //pernoume to onoma tou arxiou
            string image_path_tixeo = "https://el.wikipedia.org/wiki/%CE%91%CF%81%CF%87%CE%B5%CE%AF%CE%BF:" + get_article_image_tixeo_il_to; //topothetoume to arxio se url tis wikipidia

            ar.PictureBox7.Image = Image.FromFile(image_path_tixeo);                                                                         //emfanizoume to arxio

            //tixeo lima 2
            get_article_tixeo             = article_tixeo.articles.Where(a => a.id == article_id_1).SingleOrDefault();
            get_article_image_tixeo       = article_tixeo.imagelinks.Where(a => a.il_from == article_id_1).First();
            ar.Label16.Text               = get_article_tixeo.title;
            ar.Label17.Text               = get_article_tixeo.kimeno;
            get_article_image_tixeo_il_to = get_article_image_tixeo.il_to;
            image_path_tixeo              = "https://el.wikipedia.org/wiki/%CE%91%CF%81%CF%87%CE%B5%CE%AF%CE%BF:" + get_article_image_tixeo_il_to;
            ar.PictureBox8.Image          = Image.FromFile(image_path_tixeo);



            //tixeo lima 3
            get_article_tixeo             = article_tixeo.articles.Where(a => a.id == article_id_1).SingleOrDefault();
            get_article_image_tixeo       = article_tixeo.imagelinks.Where(a => a.il_from == article_id_1).First();
            ar.Label18.Text               = get_article_tixeo.title;
            ar.Label19.Text               = get_article_tixeo.kimeno;
            get_article_image_tixeo_il_to = get_article_image_tixeo.il_to;
            image_path_tixeo              = "https://el.wikipedia.org/wiki/%CE%91%CF%81%CF%87%CE%B5%CE%AF%CE%BF:" + get_article_image_tixeo_il_to;//
            ar.PictureBox9.Image          = Image.FromFile(image_path_tixeo);
        }