Create and deploy HTTPModule in SharePoint 2010

1. Create a class library
2. Add below code in the cs file

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using Microsoft.SharePoint;
using System.Configuration;
using Microsoft.SharePoint.ApplicationRuntime;

namespace DynamicModule
{
    public class DynamicModule : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
        }

        void context_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            Page page = HttpContext.Current.CurrentHandler as Page;
            if (page != null)
            {
                // register handler for PreInit event
                page.PreInit += new EventHandler(page_PreInit);
            }
        }

        void page_PreInit(object sender, EventArgs e)
        {
            Page page = sender as Page;

            if (page != null)
            {
                HttpApplication httpApp = sender as HttpApplication;
                HttpContext context = httpApp.Context;
                string httpUrl = context.Request.Url.ToString();             
              
                if (httpUrl.ToLower().Contains("/_layouts/settings.aspx"))
                {
                    HttpContext.Current.Server.ClearError();
                    HttpContext.Current.Response.Clear();
                    HttpContext.Current.Response.Redirect("http://google.com");
                }
            }
        }
        public void Dispose() { }
    }
}










3. Build the library and deploy the dll in the bin folder of the SharePoint web application at c:\inetpub\wwwroot\wss\virtualdirectories\<port number>\bin
4. Add the below line in <modules> section in the web.config of the SharePoint web application
<add name="DynamicModule" type="DynamicModule.DynamicModule" />

Done!!