I implement ringcentral efax api into my project but there is an error .

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C#

VB

ASP.NET

ADO.NET

Ajax

C#4.0

public string SendFax()
{
string URLAuth = "https://service.ringcentral.com/?s=1210";
WebClient webClient = new WebClient();
var formData = new NameValueCollection();
formData["Username"] = "8774211237";
formData["Password"] = "ABC12345";
formData["Recipient"] = "12485974888";
formData["Coverpagetext"] = "Some random text";
formData["Resolution"] = "High";
byte[] responseBytes = webClient.UploadValues(URLAuth, "POST", formData);
string resultAuthTicket = Encoding.UTF8.GetString(responseBytes);
webClient.Dispose();
return resultAuthTicket;
}

there is an error in SendFax .This code does not work .Its return a string .

Please Give me some solution .