C#

private void buttonLED0_Click_1(object sender, EventArgs e)
     {
         Data = Data ^= 0x01;
         int BytesToWrite = Data;
         int bytes = serialPort1.BytesToWrite;
         //UInt32 numBytesWritten = 1;
         buttonLED0.Enabled = !buttonLED0.Enabled;

         if (buttonLED0.Enabled)
         {
             pictureBoxLED0.BackgroundImage = imageList1.Images[(int)LEDColor.GreenOn];
         }

         if (!buttonLED0.Enabled)
         {

             pictureBoxLED0.BackgroundImage = imageList1.Images[(int)LEDColor.RedOn];
         }
     }

using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;

[WebService(Namespace = "http://localhost:1458/forumservices/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
{
public Service () {

//Uncomment the following line if using designed components 
//InitializeComponent(); 
}


[WebMethod]
public string welcome(string name)
{
return "Welcome " + name;
}

}

protected void Button1_Click(object sender, EventArgs e)
{

try
{
soapMessage =
@"
<?xml version=""1.0"" encoding=""utf-8""?>
<soap12:Envelope xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:soap12=""http://www.w3.org/2003/05/soap-envelope"">
<soap12:Body>
<welcome xmlns=""http://localhost:1458/forumservices/"">
<name>Rajas</name>
</welcome>
</soap12:Body>
</soap12:Envelope>";

WebClient mClient = new WebClient();



Response.Write(System.Text.Encoding.ASCII.GetString(mClient.UploadData("http://localhost:1458/forumservices/Service.asmx", "POST", System.Text.Encoding.ASCII.GetBytes(soapMessage))));
}
catch (System.Net.WebException ex)
{
if (ex.Response != null)
{
Stream strm = ex.Response.GetResponseStream();
StreamReader sr = new StreamReader(strm);
Response.Write(sr.ReadToEnd());
}
else
{
Response.Write(ex.InnerException.ToString());
}
}

}