protected void Button1_click(object sender, EventArgs e) { d.Open(); if (d.Login(this.inlognaam.Text, this.wachtwoord.Text)) { Session["gebruiker"] = inlognaam.Text; FormsAuthentication.RedirectFromLoginPage(inlognaam.Text, Persist.Checked); } else { this.Page.ClientScript.RegisterStartupScript(this.GetType(), "ex", "alert('Gegevens komen niet overeen.');", true); } }