Lab 6

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Lab_6___ESoputan
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private string fileopen; // <------------

        private SqlConnection conn = new SqlConnection();

        private void Test()
        {
            OpenFileDialog database = new OpenFileDialog();
            database.ShowDialog();

            fileopen = database.FileName; //save into the string class up
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Test();
        }

        private void btnGetAll_Click(object sender, EventArgs e)
        {
            lstBox.Items.Clear(); //clear out listbox
            int counter = 1;

            SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
            builder.DataSource = @"(localdb)\v11.0";
            builder.AttachDBFilename = fileopen;
            builder.IntegratedSecurity = true;

            conn.ConnectionString = builder.ConnectionString;

            SqlCommand cmd = new SqlCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "SELECT * FROM Suppliers";
            cmd.Connection = conn;
            conn.Open(); //open up connection

            SqlDataReader reader = cmd.ExecuteReader();

            try
            {
                lstBox.Items.Add(string.Format("Suppliers Contact Name Listings:"));
                lstBox.Items.Add(string.Format("- - - - - - - - - - - - - - - - - - - - - -"));

                while (reader.Read())
                {
                    string name, count;
                    name = reader["ContactName"].ToString();
                    count = "Row #" + counter.ToString();
                    lstBox.Items.Add(name.PadRight(40 - name.Length) + "\t\t" + count); //horizontal tab
                    counter++;
                }
            }
            finally
            {
                reader.Close();
                conn.Close();
            }

        }

        private void btnGetCountry_Click(object sender, EventArgs e)
        {
            try
            {
                lstBox.Items.Clear(); //clear out listbox
                int counter = 1;

                SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
                builder.DataSource = @"(localdb)\v11.0";
                builder.AttachDBFilename = fileopen;
                builder.IntegratedSecurity = true;

                conn.ConnectionString = builder.ConnectionString;

                SqlCommand cmd = new SqlCommand();
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("@Param", this.txtCountry.Text);
                cmd.CommandText = "SELECT * FROM Suppliers WHERE Country = @Param";
                cmd.Connection = conn;
                conn.Open(); //open up connection

                SqlDataReader reader = cmd.ExecuteReader();

                lstBox.Items.Add(string.Format("Country= " + this.txtCountry.Text));
                lstBox.Items.Add(string.Format("- - - - - - - - - - - - - - - - - - - - - -"));

                while (reader.Read())
                {
                    string name, count;
                    name = reader["ContactName"].ToString();
                    count = "Row #" + counter.ToString();
                    lstBox.Items.Add(name.PadRight(40 - name.Length) + "\t\t" + count); //horizontal tab
                    counter++;

                }
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message, "Error");
            }
            finally
            {
                conn.Close();
            }

        }

    }
}