how to display alert message in specfic time as alarm or reminder

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VS2008

ASP.NET

Visual-Studio

Hi,

I am using Asp.net,VS2008.

How to display alert message from specfic time . just like alarm or reminder.

i have used this few code but message is not display on click .

------------------------------------------------

/ displays an alert box with a specified message
    public static void Alert(string message)
    {
        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        sb.Append(@"script language=JavaScript>");
        sb.Append(@"alert('" + message + "');");
        sb.Append(@"</");
        sb.Append(@"script>");

        ((System.Web.UI.Page)HttpContext.Current.Handler).RegisterStartupScript(new Guid().ToString(), sb.ToString());
    }

--------------------------------------------------

public static class Alert
{

  /// <summary>
  /// Shows a client-side JavaScript alert in the browser.
  /// </summary>
   /// <param name="message">The message to appear in the alert.</param>
  public static void Show(string message)
  {
      // Cleans the message to allow single quotation marks
     string cleanMessage = message.Replace("'", "\\'");
     string script = "<script type=\"text/javascript\">alert('" + cleanMessage + "');</script>";

     // Gets the executing web page
      Page page = HttpContext.Current.CurrentHandler as Page;

        // Checks if the handler is a Page and that the script isn't allready on the Page
        if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert"))
       {
          page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script);
       }
    }
}

please help me...
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Regards
Mukesh