user agent random

     
       public static  string GetRndUserAgent()
       {
           string UserAgnet = "";

           Random r = new Random();
           int i = r.Next(1, 20);

           switch (i)
           {
               case 1:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.34; Windows NT 6.0; WOW64; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30618)";
                   break;

               case 2:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)";
                   break;

               case 3:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Avant Browser; .NET CLR 2.0.50727; MAXTHON 2.0)";
                   break;

               case 4:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.1; Media Center PC 3.0; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1)";
                   break;

               case 5:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 6.0)";
                   break;

               case 6:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618)";
                   break;

               case 7:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; Media Center PC 6.0; InfoPath.2; MS-RTC LM 8)";
                   break;

               case 8:
                   UserAgnet = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en) AppleWebKit/526.9 (KHTML, like Gecko) Version/4.0dp1 Safari/526.8";
                   break;

               case 9:
                   UserAgnet = "Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.9.2a1pre) Gecko/20090402 Firefox/3.6a1pre (.NET CLR 3.5.30729)";
                   break;

               case 10:
                   UserAgnet = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.8pre) Gecko/20070928 Firefox/2.0.0.7 Navigator/9.0RC1";
                   break;

               case 11:
                   UserAgnet = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b4) Gecko/20090423 Firefox/3.5b4 GTB5 (.NET CLR 3.5.30729)";
                   break;

               case 12:
                   UserAgnet = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/528.16 (KHTML, like Gecko) Version/4.0 Safari/528.16";
                   break;

               case 13:
                   UserAgnet = "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.7pre) Gecko/20070815 Firefox/2.0.0.6 Navigator/9.0b3";
                   break;

               case 14:
                   UserAgnet = "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.2) Gecko/20121223 Ubuntu/9.25 (jaunty) Firefox/3.8";
                   break;

               case 15:
                   UserAgnet = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.100 Safari/534.30";
                   break;

               case 16:
                   UserAgnet = "Opera 9.7 (Windows NT 5.2; U; en)";
                   break;

               case 17:
                   UserAgnet = "Opera/9.64 (X11; Linux x86_64; U; en) Presto/2.1.1";
                   break;

               case 18:
                   UserAgnet = "Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20100101 Firefox/4.0.1)";
                   break;

               case 19:
                   UserAgnet = "Opera/9.70 (Linux i686 ; U; zh-cn) Presto/2.2.0";
                   break;

               case 20:
                   UserAgnet = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E; Tablet PC 2.0; MALC)";
                   break;

               default:
                   UserAgnet = "MMozilla/5.0 (Windows NT 6.1; rv:5.0) Gecko/20100101 Firefox/5.0";
                   break;
           }

           return UserAgnet;
       }