Open new window with Response.Redirect() in Asp.net- 3rd part

In 2nd part of the following post I show you how to open a new window in asp.net using "ResponseHelper "class. Now today I want to share another approach with "Extension method".

Third approach(Extension method)
public static class ResponseHelper {
    public static void Redirect(this HttpResponse response,
        string url,
        string target,
        string windowFeatures) {
 
        if ((String.IsNullOrEmpty(target) ||
            target.Equals("_self", 
StringComparison
.OrdinalIgnoreCase)) &&
                         String.IsNullOrEmpty(windowFeatures)) {
 
            response.Redirect(url);
        }
        else {
            Page page = (Page)HttpContext.Current.Handler;
            if (page == null) {
                throw new InvalidOperationException(
                    "Cannot redirect to new window outside
Page context."
);
            }
            url = page.ResolveClientUrl(url);
 
            string script;
            if (!String.IsNullOrEmpty(windowFeatures)) {
                script = @"window.open(""{0}"", ""{1}"",
""{2}"");"
;
            }
            else {
                script = @"window.open(""{0}"", ""{1}"");";
            }
 
            script = String.Format(script, url, target,
windowFeatures);
            ScriptManager.RegisterStartupScript(page,
                typeof(Page),
                "Redirect",
                script,
                true);
        }
    }
}

Note the 'this' keyword in the first parameter.
Now whenever we include the namespace this class
is defined within, we get a nice override on the
actual Response object.

Ex:
Response.Redirect("popup.aspx", "_blank", "menubar=0,width=100,height=100");

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