WPF

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
using Microsoft.Win32;

namespace WPF2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// CRUD
    /// FILES
    /// FILES WITH DATABASE
    /// CLOSE HIDE MULTIPLE WINDOWS
    /// LOGIN
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        WPFCRUD1Entities1 context = new WPFCRUD1Entities1();
        User usr = new User();

        //Save
        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            usr.Username = txtUser.Text;
            usr.Pass = txtPass.Password;
            context.Users.Add(usr);
            context.SaveChanges();
        }

        //Update
        private void btnUpdate_Click(object sender, RoutedEventArgs e)
        {
            int id = int.Parse(txtSearch.Text);
            bool isFound = context.Users.Where(x => x.ID == id).Any();
            if (isFound)
            {
                usr = context.Users.Where(x => x.ID == id).FirstOrDefault();
                usr.Pass = txtPass.Password;
                usr.Username = txtUser.Text;
                context.SaveChanges();
                MessageBox.Show("Data Updated");
            }
            else
            {
                MessageBox.Show("Update Failed");
            }
        }

        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            int id = int.Parse(txtSearch.Text);
            bool isFound = context.Users.Where(x => x.ID == id).Any();
            if (isFound)
            {
                usr = context.Users.Where(x => x.ID == id).FirstOrDefault();
                context.Users.Remove(usr);
                context.SaveChanges();
                MessageBox.Show("Record Deleted");
            }
            else
            {
                MessageBox.Show("No ID found");
            }
        }

        private void btnSearch_Click(object sender, RoutedEventArgs e)
        {
            int id = int.Parse(txtSearch.Text);
            bool isFound = context.Users.Where(x => x.ID == id).Any();
            if (isFound)
            {
                usr = context.Users.Where(x => x.ID == id).FirstOrDefault();
                txtUser.Text = usr.Username;
                txtPass.Password = usr.Pass;
            }
            else
                MessageBox.Show("Record Not Found");
        }

        private void ckShowGrid_Checked(object sender, RoutedEventArgs e)
        {
            var data = context.Users.ToList();
            dataGrid.ItemsSource = data;
        }

        private void ckShowGrid_Unchecked(object sender, RoutedEventArgs e)
        {
            dataGrid.ItemsSource = null;
        }

        private void btnOpenFile_Click(object sender, RoutedEventArgs e)
        {
            System.Windows.Forms.OpenFileDialog open = new System.Windows.Forms.OpenFileDialog();

            open.Title = "Open File";
            open.Filter = "Text Files (*.txt)|*.txt| All Files (*.*)|*.*";

            if (open.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                StreamReader read = new StreamReader(File.OpenRead(open.FileName));
                txtUpload.Text = read.ReadToEnd();
                read.Dispose();
            }
        }

        private void btnSaveFile_Click(object sender, RoutedEventArgs e)
        {
            System.Windows.Forms.SaveFileDialog save = new System.Windows.Forms.SaveFileDialog();

            save.Title = "Save File";
            save.Filter = "Text Files (*.txt)|*.txt| All Files (*.*)|*.*";

            if (save.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                StreamWriter write = new StreamWriter(File.Create(save.FileName));

                write.Write(txtUpload.Text);
                write.Dispose();
            }
        }

        private void btnDbFile_Click(object sender, RoutedEventArgs e)
        {
            DBFILE win2 = new DBFILE();
            win2.Show();
        }

        //POP-UP OPEN
        private void Show_Click(object sender, RoutedEventArgs e)
        {
            MyPopup.IsOpen = true;
        }

        //POP-UP CLOSE / CLICKING OUTSIDE ITS DONE IN XAML WITH STAYSOPEN
        private void Hide_Click(object sender, RoutedEventArgs e)
        {
            MyPopup.IsOpen = false;
        }
    }
}