string output = Regex.Replace(input, @"</?(?i:meta|embed|script|frameset|frame|iframe|object|link)(.|\n)*?>", ""); 

protected void Application_BeginRequest(Object sender, EventArgs e)
{
	// code to make blogs search engine friendly
	HttpContext incoming = HttpContext.Current;
	string oldpath = incoming.Request.Path.ToLower();
	if(oldpath.ToLower().IndexOf("_page-")>0)
	{
		string pageRedirect = oldpath.Substring(oldpath.LastIndexOf("/")+1);
		pageRedirect = pageRedirect.Substring(0,pageRedirect.ToLower().IndexOf("_page"));
		// extract the items
		string qsItemsTemp = oldpath.Substring(oldpath.ToLower().IndexOf("_page-")+6);
		qsItemsTemp = qsItemsTemp.Substring(0,qsItemsTemp.ToLower().IndexOf(".aspx"));
		string[] qsItems = qsItemsTemp.Split('-');
		string theQString = "";
		for (int i=0;i<=qsItems.GetUpperBound(0);i++)
		{
			if (theQString.Length>0)
			{
				theQString += "&";
			}
			theQString += qsItems[i].ToString() + "=" + qsItems[i+1].ToString();
			i++;
		}
		incoming.RewritePath (pageRedirect + ".aspx?" + theQString); 
	}
	else

	{
		// Display path if it doesn’t contain _pageX.aspx
		incoming.RewritePath(oldpath );
	}
}

protected override void OnError(EventArgs e)
{
	System.Exception theError = Server.GetLastError();

	if(theError.GetBaseException() is System.Web.HttpRequestValidationException )
	{
		System.Diagnostics.Debug.Assert(false);
		Response.Write("<hr><p align=center>BAD BOY!!! You are trying to insert HTML tags or XSS script to the field.<br>Please use the button below to remove the tags from your input!<br><br>Thank you...</p>");
		Response.Write("<p align=center><input type=button language=javascript value='<< BACK' onclick ='window.history.go(-1);'></p><hr>");
		Response.StatusCode = 200;
		Response.End();        
	}       
}