C# Application for DB

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // Get the text

            string text = textBoxRecenicaUnos.Text;

            if (text != "")
            {
                // Open SQL Conn
                MySqlConnection MyCon;
                MySqlCommand upit;
                string arg = "datasource=localhost;port=3306;username=root;password=";
                MySqlDataReader res;
                MyCon = new MySqlConnection(arg);
                // INSERT
                string insert = "USE recenica; INSERT INTO recenica (VAL) VALUES('" + text + "');";
                upit = new MySqlCommand(insert, MyCon);
                MyCon.Open();
                res = upit.ExecuteReader();
            }
        }

        // Export sve iz baze
        private void button2_Click(object sender, EventArgs e)
        {
            comboBox1.Items.Clear();
            comboBox1.Enabled = true;

            // Open SQL Conn
            MySqlConnection MyCon;
            MySqlCommand upit;
            string arg = "datasource=localhost;port=3306;username=root;password=";
            MySqlDataReader res;
            MyCon = new MySqlConnection(arg);
            // SELECT

            string insert = "USE recenica; SELECT VAL FROM recenica;";
            upit = new MySqlCommand(insert, MyCon);
            MyCon.Open();
            res = upit.ExecuteReader();
            while (res.Read())
            {
                string a = res["VAL"].ToString();
                comboBox1.Items.Add(a);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            string resss = "";

                        // Open SQL Conn
            MySqlConnection MyCon;
            MySqlCommand upit;
            string arg = "datasource=localhost;port=3306;username=root;password=";
            MySqlDataReader res;
            MyCon = new MySqlConnection(arg);
            // SELECT

            string insert = "USE recenica; SELECT VAL FROM recenica;";
            upit = new MySqlCommand(insert, MyCon);
            MyCon.Open();
            res = upit.ExecuteReader();
            while (res.Read())
            {
                string a = res["VAL"].ToString();
                resss += a;
                resss += "\n";
            }





            Document doc = new Document(PageSize.A4);
            currpath = Directory.GetCurrentDirectory();
            var output = new FileStream(currpath + "RECENICE.pdf", FileMode.Create);
            var writer = PdfWriter.GetInstance(doc, output);

            doc.AddTitle("Sve recenice iz Baze");
            doc.AddSubject("Evo svih recenica: ---");

            doc.AddAuthor("Dragos i Nikola");

            doc.Open();
            doc.Add(new Paragraph(resss));

            doc.Close();

        }



        public  string currpath { get; set; }}
}