How does UploadValues work?

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C#

Hello.

I am trying to upload custom values to specific URL and get the result that is given from the web site.

The problem that is occurring is that I don't know how to simulate "press" the input type="button".

Is the value wrong or something

Here is the link [^](English version)

I use the Bulgarian version but that doesn't matter.

WebClient myWebClient = new WebClient();
            myWebClient.Credentials = CredentialCache.DefaultCredentials;
            myWebClient.Headers.Add(HttpRequestHeader.UserAgent, "anything");
            myWebClient.Proxy = null;
            Uri uri = new Uri(@"http://validni.mvr.bg/nbds2/Web2.nsf/fVerification");

            NameValueCollection fromData = new NameValueCollection();
            const string DocTypePassport = "6730";
            const string DocumentNumber = "363511664";

            fromData.Add("_doClick", "C2257C590037DB52.a1a096ff9bbd6b84c22572a3005638f0/$Body/0.145E");
            fromData.Add("%%Surrogate_TypeDoc", "1");
            fromData.Add("TypeDoc", DocTypePassport);
            fromData.Add("Number", DocumentNumber);

            byte[] responceArray = myWebClient.UploadValues(uri, "POST", fromData);

            Console.WriteLine(Encoding.ASCII.GetString(responceArray));

The problem is that I don't get result, that looks like this.