Java Script Alert in C#

ADD A CLASS IN APP_CODE AND REPLACE WITH FOLLOWING CODE.RENAME THE CLASS FILE WITH Alert.cs


using System.Web;
using System.Text;
using System.Web.UI;

///

/// A JavaScript alert
///

public static class Alert
{

///

/// Shows a client-side JavaScript alert in the browser.
///

/// The message to appear in the alert.
public static void Show(string message)
{
// Cleans the message to allow single quotation marks
string cleanMessage = message.Replace("'", "\\'");
string 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);
}
}

}