How to Consume WebService Using HttpWebRequest

See more:

C#

C#4.0

ASP.NET4

Hi Everyone,

I am new to consume a Web service through HttpWebRequest.So i create a dummy application for learning purpose.My question may be silly but answers would be appreciated.

I have created a demo web service, Below is the code

[WebMethod]
        public DataSet GetEmployees()
        {
            SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["FAST"].ConnectionString);
            SqlCommand cmd = new SqlCommand("select * from Employee", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
        }

Here i am returning DataSet and i want to bind it in GridView in my client Application.
The Below are the Client application code

string url = "http://localhost:2018/EmployeeService.asmx";
            HttpWebRequest webreq = (HttpWebRequest)WebRequest.Create(url);
            webreq.ContentType = "text/xml; charset=utf-8";
            //webreq.Accept = "text/xml";
            webreq.Headers.Clear();
            webreq.Method = "POST";
            Encoding encode = Encoding.GetEncoding("utf-8");
            HttpWebResponse webres = null;
            webres = (HttpWebResponse)webreq.GetResponse();
            Stream reader = null;
            reader = webres.GetResponseStream();
            StreamReader sreader = new StreamReader(reader, encode, true);
            string result = sreader.ReadToEnd();

While running i am getting error "The remote server returned an error: (500) Internal Server Error." in this line, webres = (HttpWebResponse)webreq.GetResponse();

Anyone have any idea where i did mistake.