DugunSalonu/FrmLogin.cs

using DugunSalonu.Models;
using Microsoft.EntityFrameworkCore;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Buffers;
using System.Resources;
using DugunSalonu.Properties;

namespace DugunSalonu
{
    public partial class FrmLogin : Form
    {
        public FrmLogin()
        {
           
            InitializeComponent();
        }

        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        public static extern bool ReleaseCapture();


       
        private void FrmLogin_Load(object sender, EventArgs e)
        {
          
        }

        private void btnVazgec_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private async void btnGiris_Click(object sender, EventArgs e)
        {
           
            try
            {
                using (dugunsalonuContext db = new dugunsalonuContext())
                {
                    var user = await db.kullanici.Where(k => k.kullaniciadi == txtKullanici.Text && k.aktif == true && k.parola == txtSifre.Text).FirstOrDefaultAsync();
                    if (user != null)
                    {
                        btnGiris.BackgroundImage = Resources.loginAcik;
                         Task.Delay(2000).Wait();
                        FrmAddKullanici f1 = new FrmAddKullanici();
                        f1.Show();
                        this.Hide();
                    }
                    else { MessageBox.Show("Hatalý kullanýcý bilgileri.", "Hata"); }
                    //Kullanici girisKullanicisi = await db.Kullanici.Where(k => k.KullaniciAdi == txtKullanici.Text && k.Parola == txtSifre.Text).FirstOrDefaultAsync();
                }
            }
            catch (Exception)
            {

                throw;
            }
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void pnlTop_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }
    }
}