//button za dodati termin klik
        protected void OnButton225Clicked(object sender, EventArgs e)
        {
            if (comboboxNP.ActiveText == null || spinbutton1.Text == "0" || spinbutton3.Text == "0" || spinbutton2.Text == "0")
            {
                ZaVoditeljeDialog2 win1 = new ZaVoditeljeDialog2();
                win1.Show();
            }

            else
            {
                DateTime x;
                x = calendar1.Date;
                string y;
                y = x.ToString("dd.MM.yyyy.");

                string z;
                z = comboboxNP.ActiveText;
                int u = Convert.ToInt32(spinbutton2.Text);

                string           connectionString = "URI=file:bazapodataka.db";
                SqliteConnection con = new SqliteConnection(connectionString);
                con.Open();

                SqliteCommand dbInsertCmd = con.CreateCommand();
                dbInsertCmd.CommandText = String.Format(@"INSERT INTO Termini (Nacionalnipark, Datum, Cijena_djeca, Cijena_odrasli, Kapacitet) 
								                                                        VALUES('{0}', '{1}', '{2}', '{3}', {4})"                                , comboboxNP.ActiveText, y, spinbutton1.Text, spinbutton3.Text, u);

                dbInsertCmd.ExecuteNonQuery();
                dbInsertCmd.Dispose();
                con.Close();

                ZaVoditeljeDialog3 win1 = new ZaVoditeljeDialog3();
                win1.Show();
            }
        }
        //spremanje novog termina
        protected void OnButton225Clicked(object sender, EventArgs e)
        {
            if (comboboxNP.ActiveText == null || spinbutton1.Text == "0" || spinbutton3.Text == "0" || spinbutton2.Text == "0")
            {
                ZaVoditeljeDialog2 win1 = new ZaVoditeljeDialog2();
                win1.Show();
            }

            else
            {
                DateTime x;
                x = calendar1.Date;
                string y;
                y = x.ToString("dd.MM.yyyy.");

                string z;
                z = comboboxNP.ActiveText;
                int u = Convert.ToInt32(spinbutton2.Text);

                string           connectionString = "URI=file:bazapodataka.db";
                SqliteConnection con = new SqliteConnection(connectionString);
                con.Open();

                SqliteCommand dbInsertCmd = con.CreateCommand();
                dbInsertCmd.CommandText = String.Format(@"INSERT INTO Termini (Nacionalnipark, Datum, Cijena_djeca, Cijena_odrasli, Kapacitet) 
						                                                        VALUES('{0}', '{1}', '{2}', '{3}', {4})"                        , comboboxNP.ActiveText, y, spinbutton1.Text, spinbutton3.Text, u);

                dbInsertCmd.ExecuteNonQuery();
                dbInsertCmd.Dispose();
                con.Close();

                ZaVoditeljeDialog3 win1 = new ZaVoditeljeDialog3();
                win1.Show();

                //dio za refresh
                termini.Clear();
                buttonIzbrisi.Sensitive = false;
                string           connectionStringg = "URI=file:bazapodataka.db";
                SqliteConnection conn = new SqliteConnection(connectionStringg);
                conn.Open();
                SqliteCommand cc = conn.CreateCommand();
                cc.CommandText = string.Format(@"SELECT Nacionalnipark, Datum FROM Termini WHERE Nacionalnipark = '{0}'", comboboxNP.ActiveText);

                SqliteDataReader reader = cc.ExecuteReader();
                while (reader.Read())
                {
                    Termin a = new Termin();
                    a.Nacionalnipark = (string)reader["Nacionalnipark"];
                    a.Datum          = (string)reader["Datum"];

                    termini.Add(a);
                }
                int b = 0;
                int q = 0;

                while (q < 20)
                {
                    comboboxTermini.RemoveText(q);
                    q++;
                }
                q = 0;
                while (q < 20)
                {
                    comboboxTermini.RemoveText(u);
                    q++;
                }
                comboboxTermini.RemoveText(0);
                foreach (var i in termini)
                {
                    comboboxTermini.InsertText(b, i.Datum);

                    b++;
                }

                cc.Dispose();
                conn.Close();
            }
        }