Consuming REST WCF Service in Windows Forms Application

void CallBackJSONAddRequest(IAsyncResult ar)
{
    //Contains information of the Async object containing Request Information
    WebRequest req = (WebRequest)ar.AsyncState;
    //Returns stream for writing data to the Web Resource
    Stream reqStream = req.EndGetRequestStream(ar);
    reqStream.Close();

    //Now Collect the response Asynchronously
    req.BeginGetResponse(CallBackJSONResponse, req);
}
//Response Callback, is mandatory to complete operations on the receiving end
void CallBackJSONResponse(IAsyncResult ar)
{
    try
    {
        WebRequest req = (WebRequest)ar.AsyncState;
        //Collect the reponse
        WebResponse res = req.EndGetResponse(ar);
        Stream strResult = res.GetResponseStream();

        strResult.Close();
        res.Close();
    }
    catch (Exception ex)
    {
        string s = ex.Message;
    }
}



private void button1_Click(object sender, EventArgs e)
{
    string uploadUrl = "http://localhost:7794/GetEmployees.svc/CreateEmployee/" + textBox1.Text + "/" + textBox2.Text + "/" + textBox3.Text;
    WebRequest addRequest = WebRequest.Create(uploadUrl);
    addRequest.Method = "POST";
    //Begin the Asynchrnous Request
    addRequest.BeginGetRequestStream(CallBackJSONAddRequest, addRequest);
    label1.Text = "Employee" + textBox1.Text + "Inserted Successfuly";
    textBox1.Text = "";
    textBox2.Text = "";
    textBox3.Text = "";
}