private void btnLogin_Click(object sender, EventArgs e) { string userName, password; userName = txtUserName.Text; password = txtPassword.Text; Users user = db.Users.Where(x => x.UserName == userName && x.Password == password).FirstOrDefault(); if (user != null) { if (user.isManager == true) { AdminForms.Dashboard dashboard = new AdminForms.Dashboard(); this.Hide(); dashboard.ShowDialog(); } else { PersonelForms.SmartMedicine sm = new PersonelForms.SmartMedicine(); this.Hide(); sm.ShowDialog(); } } else { MessageBox.Show("Kullanıcı adı veya parola yanlış."); } }