protected void deleteClientButton_Click(object sender, EventArgs e)
        {
            using (Clcontext conetxt = new Clcontext())
            {
                ClientTable client = conetxt.ClientTables.Find(Int32.Parse(TextBox1.Text));
                if(client != null)
                {
                    conetxt.ClientTables.Remove(client);
                    conetxt.SaveChanges();
                }

            }
        }
        protected void addButton_Click(object sender, EventArgs e)
        {
            if(IsNotEmpty())
            {
                using (Clcontext context = new Clcontext())
                {
                    ClientTable client = new ClientTable();
                    client.FORENAME = _Forename_Textbox.Text;
                    client.SURNAME = _Surname_textbox.Text;
                    client.AGE = Int32.Parse(_age_textbox.Text);
                    client.ADDRESS = _address_textbox.Text;
                    client.CITY_ID = Int32.Parse(_cityid_textbox.Text);

                    context.ClientTables.Add(client);
                    context.SaveChanges();
                }
            }
        }