C#

AutoGenerateColumns=false

<pre>var book = context.Books
                .Where(b => b.ISBN == txtISBN.Text).ToList();

            dataGridViewBook.DataSource = book;

<pre>using System;
using System.Windows.Forms;
using IniParser;
using IniParser.Model;
using System.Collections.Generic;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public string myFilePath;
        public string searchItem;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            searchBtn.Enabled = false;
            writeIniBtn.Enabled = false;
            saveBtn.Enabled = false;
            AcceptButton = this.searchBtn;
        }

        private void openIniBtn_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();

            openFile.InitialDirectory = "c:\\";
            openFile.Filter = "INI files (*.ini)|*.ini";
            openFile.Title = "Select a INI file for edit";

            if (openFile.ShowDialog() == DialogResult.OK)
            {
                myFilePath = openFile.FileName; // full path to a file
                
                // enable buttons
                searchBtn.Enabled = true;
                writeIniBtn.Enabled = true;
                saveBtn.Enabled = true;
                openIniBtn.Enabled = false; // disable open ini button
            }
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            // populate listbox with founded items
            List<string> selectedItems = new List<string>();

            string item = listBox1.SelectedItem.ToString();

            if (!selectedItems.Contains(item))
            {
                selectedItems.Add(item);
            }

            // get clicked item value, section / key
            foreach (string i in listBox1.SelectedItems)
            {
                itemIdTxt.Text = i.Split('[', ']')[1];
                nameInput.Text = i.Split('[', ']')[2];
            }

            
        }

        private void searchBtn_Click(object sender, EventArgs e)
        {
            var searchItem = searchInput.Text; // read value from search input
            
            // start ini
            var parser = new FileIniDataParser();
            parser.Parser.Configuration.AllowDuplicateKeys = true;  // allow duplicate keys
            IniData data = parser.ReadFile(myFilePath);             // opens ini and search in it , myFilePath = path to ini file

            listBox1.Items.Clear(); // clear list

            searchItem = searchInput.Text;  // getting data from input to search for
            
            // loop through sections
            foreach (var item in data.Sections)
            {
                // search for string under key 1
                if (item.Keys["1"].IndexOf(searchItem, 0, StringComparison.CurrentCultureIgnoreCase) != -1)
                {
                    // founded items
                    var foundedItems = ($"[{item.SectionName}] {item.Keys["1"]}");
                    
                    // add founded items to list
                    ListBox list = new ListBox();
                    listBox1.Items.Add(foundedItems);
                }
            }
        }

        private void saveBtn_Click(object sender, EventArgs e)
        {
            var id = itemIdTxt.Text;    // read id
            var name = nameInput.Text;  // read name

            // write to ini file
            var parser = new FileIniDataParser();
            parser.Parser.Configuration.AllowDuplicateKeys = true;
            IniData data = parser.ReadFile(myFilePath);
            data[id]["1"] = name;
            parser.WriteFile(myFilePath, data);

            // update changed item in listbox
            string index = listBox1.SelectedItem.ToString();
            listBox1.Items.Remove(index);
            listBox1.Items.Add(name);
        }

        
    }
}

using System;
using System.Windows.Forms;
using IniParser;
using IniParser.Model;
using System.Collections.Generic;
using System.IO;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public string myFilePath;
        //string myFilePath;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            searchBtn.Enabled = false;
            writeIniBtn.Enabled = false;
            saveBtn.Enabled = false;
        }

        private void openIniBtn_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();

            openFile.InitialDirectory = "c:\\";
            openFile.Filter = "INI files (*.ini)|*.ini";
            openFile.Title = "Select a INI file for edit";

            if (openFile.ShowDialog() == DialogResult.OK)
            {
                string myFilePath = openFile.FileName;
                // MessageBox.Show("my file path : " + myFilePath); // shows full path to file
                
                // enable buttons
                searchBtn.Enabled = true;
                writeIniBtn.Enabled = true;
                saveBtn.Enabled = true;
                openIniBtn.Enabled = false;
            }
        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count != 0)
            {
                ListViewItem item = listView1.SelectedItems[0];

                string output = item.Text.Split('[', ']')[1];
                string outputt = item.Text.Split('[', ']')[2];
                
                // set name and id
                itemIdTxt.Text = output.ToString();
                nameInput.Text = outputt.ToString();
            }
        }

        private void searchBtn_Click(object sender, EventArgs e)
        {
            MessageBox.Show("my file path : " + myFilePath); // show me a blank message