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How to send request to vuforia api

I'm trying to rewrite the code from Java to C #, but I can't. Maybe someone reworked stringbuilder? Everything that i wrote it's: class SignatureBuilder         {             public string tmsSignature(HttpWebRequest request, string seckretKey)             {

                string method = request.Method;                 string ContentType = "";                 string HexDigest = "d41d8cd98f00b204e9800998ecf8427e";                 if (method.Equals("GET", StringComparison.OrdinalIgnoreCase) || method.Equals("DELETE", StringComparison.OrdinalIgnoreCase))                 { }                 else if (method.Equals("POST", StringComparison.OrdinalIgnoreCase) || method.Equals("PUT", StringComparison.OrdinalIgnoreCase))                 {                     ContentType = "application/json";                     //HexDigest=MD5CryptoServiceProvider.Create()                 }                 else                 { System.Console.WriteLine("Error: invalid content type passed to Sig Builder"); }                 string dateValue = request.Date.ToUniversalTime().ToString();                 string requestPath = request.RequestUri.ToString();                 string toDigest = "method + " + "\n" + " + HexDigest + " + "\n" + " + ContentType + " + "\n" + " + dateValue + " + "\n" + " + requestPath";                 string shaHashed = "";                 return "0";             }             public string contentMD5(HttpWebRequest request)             {                 MemoryStream stream = new MemoryStream(Convert.ToByte(request));                 Console.WriteLine(stream.Length);                 Console.ReadLine();                 return "";             }         }

I just don't can understand how code feature contentMD5 in c#?