How To Create Javascript Alert from ASP.NET code behind

In this post I will show you how to generate javascript alert from code behind

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

///
/// A JavaScript alert
///
public static class Alert
{

    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('" + message + "');</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);
        }
    }
}

How to use 

 protected void btnTest_Click(object sender, EventArgs e)
    {
        try
        {

            Alert.Show(" saved");
        }
        catch (Exception ex)
        {
            Alert.Show(ex.Message);
        }

    }