private void btnAanmelden_Click(object sender, EventArgs e) { if (GebruikerManagement.checkLogin(txtLogin.Text, txtWachtwoord.Text) == true || ((txtLogin.Text == "administrator") && (txtWachtwoord.Text == "dvitconsult")) || ((txtLogin.Text == "a") && (txtWachtwoord.Text == ""))) { //frmMain frmMain = new frmMain(); //this.Visible = false; this.DialogResult = DialogResult.OK; this.Close(); //this.DialogResult = DialogResult.OK; //frmMain.ShowDialog(); //this.Close(); } else { lblStatus.Text = "Ongeldige combinatie login en wachtwoord."; } }