RegisterStartupScript doesn’t work with ScriptManager,Updatepanel. Why is that?

protected void timer1_Tick(object sender, EventArgs e) { foreach (RepeaterItem item in rpChat.Items) { TextBox txt = item.FindControl("txtChatMessage") as TextBox; if (txt != null) { message[i] = txt.Text; i–; } } lblStatusChat.Text = ""; RepeaterBind(); string javaScript = "<script language=JavaScript>n" + "alert('Button1_Click client-side');n" + "</script>"; Page.ClientScript.RegisterStartupScript(this.GetType(), "myKey", javaScript); } timer_click trigggers and update panel. And the … Read more