Use C HttpWebRequest to send json to web service

Question

I am new to JSON and need help  I have some JSON working in jquery and get the information back correctly from the web service I have running on the web  However  I can t get it to work using HttpWebRequest in C   I will post the code below        lt summary gt      Summary description for VBRService      lt  summary gt   WebService Namespace    http   test visitblueridge com      WebServiceBinding ConformsTo   WsiProfiles BasicProfile1 1    System ComponentModel ToolboxItem false      To allow this Web Service to be called from script  using ASP NET AJAX  uncomment the following line    System Web Script Services ScriptService  public class VBRService   System Web Services WebService        WebMethod      public string HelloWorld                 return  Hello World               WebMethod       ScriptMethod ResponseFormat   ResponseFormat Json       public string callJson string x                return  Worked      x            That is on the web service and I want to be able to call  callJson string x   using this code   var httpWebRequest    HttpWebRequest WebRequest Create webAddr           httpWebRequest ContentType    text json           httpWebRequest Method    POST            using  var streamWriter   new StreamWriter httpWebRequest GetRequestStream                           string json       x     true                   streamWriter Write json               streamWriter Flush                       var httpResponse    HttpWebResponse httpWebRequest GetResponse            using  var streamReader   new StreamReader httpResponse GetResponseStream                           var result   streamReader ReadToEnd                return result              I keep getting an internal server error  When I change the type to application json and add   request Headers Add  SOAPAction    http   test visitblueridge com callJson      I get an unaccepted media error   Thank you in advance and hope this helps others

User · Accepted Answer

First of all you missed ScriptService attribute to add in webservice.

[ScriptService]

After then try following method to call webservice via JSON.

        var webAddr = "http://Domain/VBRService.asmx/callJson";
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
        httpWebRequest.ContentType = "application/json; charset=utf-8";
        httpWebRequest.Method = "POST";            

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = "{\"x\":\"true\"}";

            streamWriter.Write(json);
            streamWriter.Flush();
        }

        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            return result;
        }

[c#] Use C# HttpWebRequest to send json to web service

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