C# REST PUT

Create a solution structure as follows:

Solution Root
|- ServiceClient (Console)
    |-- Program.cs
|- ServoceHost (Console)
    |-- App.config
    |-- Program.cs
|- ServiceLibrary (WCF Service Library)
    |-- IHelloWorldService.cs

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ServiceLibrary IHelloWorldService.cs

using System.ServiceModel;
using System.ServiceModel.Web;

namespace ServiceLibrary
{
    [ServiceContract]
    public interface IHelloWorldService
    {
        
        [OperationContract]
        [WebInvoke(Method = "POST", UriTemplate = "/{name}")]
        string SayHello(string name);
    }

    [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
    public class HelloWorldService : IHelloWorldService
    {
        public string SayHello(string name)
        {
            return string.Format("Hello {0}!", name);
        }
    }
}

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ServiceHost Program.cs

using ServiceLibrary;
using System;
using System.ServiceModel.Web;

namespace ServiceHost
{
    class Program
    {
        static void Main(string[] args)
        {
            WebServiceHost host = new WebServiceHost(typeof(HelloWorldService));
            try
            {
                host.Open();
                Console.WriteLine("Press <RETURN> to stop the service");
                Console.ReadLine();
                host.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                host.Abort();
            }
        }
    }
}

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ServiceHost App.config
Add the following between the <configuration></configuration> tags in your App.config file.

<system.serviceModel>
  <services>
    <service name="ServiceLibrary.HelloWorldService">
      <host>
        <baseAddresses>
          <add baseAddress="http://localhost:8080/hello"/>
        </baseAddresses>
      </host>
    </service>
  </services>
</system.serviceModel>

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ServiceClient Program.cs

using ServiceLibrary;
using System;
using System.ServiceModel.Web;

namespace ServiceClient
{
    class Program
    {
        static void Main(string[] args)
        {
            WebChannelFactory<IHelloWorldService> cf = new WebChannelFactory<IHelloWorldService>(new Uri("http://localhost:8080/hello"));
            IHelloWorldService client = cf.CreateChannel();
            Console.WriteLine("What is your name?");
            string response = client.SayHello(Console.ReadLine());
            Console.WriteLine(response);
            Console.WriteLine("Press <RETURN> to close");
            Console.ReadLine();
        }
    }
}

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ServiceHost and ServiceClient both require a reference to the ServiceLibrary project.  Also all projects will require additional references to System.ServiceModel and System.ServiceModel.Web.

You will most likely need to run Visual Studio as an administrator as access to ports is usually restricted, so running this as a non administrator will throw an access denied error in the ServiceHost when attempting to open the port.

I do not control the service. I have a URL and list of parameters to be passed. All I want to do is insert/update records using PUT/POST. I am able to do GET.

how are you performing GET? Please post your code.

Have a look on this

http://www.codeproject.com/Articles/18034/HttpWebRequest-Response-in-a-Nutshell-Part-1

Here is my GET code:

HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("//url");
            myRequest.Headers.Add("//key", "//value");
            WebResponse response = myRequest.GetResponse();
            Stream responseData = response.GetResponseStream();

            StreamReader reader = new StreamReader(responseData);

            string responseFromServer = reader.ReadToEnd();

The codeproject article talks about HTTP POST. I am trying to do PUT using REST.

The API documentation asks me to send some required parameters and they show their sample input in json

ok, creating a JSON string is another topic and deserves another Question.
As a summary, you may need to use the JavaScriptSerializer class. Some tutorial here:
http://blogs.microsoft.co.il/blogs/pini_dayan/archive/2009/03/12/convert-objects-to-json-in-c-using-javascriptserializer.aspx
Once you have your JSON string, use the suggested code with mime type "application/json"