Put this in a file called Helpers.cshtml in App_Code:

@functions {
    public static string GetHtmlPage(string url){
    
        WebRequest request = HttpWebRequest.Create(url);
        WebResponse response = request.GetResponse();
        using (StreamReader sr = new StreamReader(response.GetResponseStream())){
            return sr.ReadToEnd();
        }
    }
}

Then in your page, you can do this:

var db = Database.Open("MyDb)";
var sql = "INSERT INTO table (myField) VALUES (@0);
var page = Helpers.GetHtmlPage("http://www.google.com");
db.Execute(sql, page);