Code
NetworkCredential myCredentials = new NetworkCredential("user", "pwd"); 
            WebRequest myWebRequest = WebRequest.Create(http://192.168.1.110/);
            myWebRequest.Credentials = myCredentials.GetCredential(new Uri("http://192.168.1.110/"), "Basic"); 

Code
 WebRequest wrqust = WebRequest.Create(new Uri("http://192.168.1.110/ 
            wrqust.PreAuthenticate = true; 
            string a = "user:pwd"; 
            byte[] b = System.Text.Encoding.Default.GetBytes(a); 
            a = Convert.ToBase64String(b); 
            wrqust.Headers.Add("Authorization", "Basic " + a); 
            wrqust.Headers.Add("Accept-Encoding", "gzip, deflate"); 
            wrqust.Headers.Add("Accept-Language", "zh-cn"); 
            wrqust.Headers.Add("Cookie", "SessionID=962IE22254"); 
            WebResponse response=null; 
            try 
            { 
                response = wrqust.GetResponse(); 
            
            } 
            catch(WebException e) 
            { 
                Console.WriteLine(e.Message); 
            }