c# - JavaScript: Alert.Show(message) From ASP.NET Code-behind

Question

I am reading this JavaScript: Alert.Show(message) From ASP.NET Code-behind

I am trying to implement the same. So I created a static class like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Text;
using System.Web.UI;

namespace Registration.DataAccess
{
    public static class Repository
    {
        /// <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); 
               } 
            } 
    }
}

On this line:

string script = "<script type="text/javascript">alert('" + cleanMessage + "');</script>"; 

It is showing me the error: ; Expected

And also on

page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script); 

Err: The type or namespace name 'Alert' could not be found (are you missing a using directive or an assembly reference?)

What am I doing wrong here?

Answer 1

Here is an easy way:

Response.Write("<script>alert('Hello');</script>");