Shows a client-side JavaScript alert in the browser.

using System.Web;

using System.Text;

using System.Web.UI;

/// <summary>

/// A JavaScript alert

/// </summary>

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);

    }

  }

}