private void button1_Click(object sender, EventArgs e) { DbEntityUrunEntities db = new DbEntityUrunEntities(); var sorgu = from x in db.TBLADMIN where x.KULLANICI == textBox1.Text && x.SIFRE == textBox2.Text select x; if (sorgu.Any()) { FrmAnaForm fr = new FrmAnaForm(); fr.Show(); this.Hide(); } else { MessageBox.Show("Hatalı Giriş!"); } }