ASP.NET

@Url.Action("Action", "Controller");

var url = "/Customer/load_StateCodes/";

// bindable version of Country Code for address forms
$("#CountryCode").change(function () {

    var procemessage = "<option value='0'> Please wait...</option>";
    $("#StateCode").html(procemessage).show();       

    $.ajax({
        type: "POST",
        url: '@Url.Action("load_StateCodes", "Customer")',
        data: { stateId: $("#CountryCode > option:selected").attr("value") },
        cache: true,
        type: "POST",
        dataType: "json",
        error: function (data) {
            alert(data);
        },
        success: function (data) {
            var items = [];
            items.push("<option>--Choose Your State--</option>");
            $.each(data, function () {
                items.push("<option value=" + this.Value + ">" + this.Text + "</option>");
            });
            $("#StateCode").html(items.join(' '));
        }
    })
});

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.abc.com/showmydata/installinfo.php");
       request.Method = "POST";
       request.ContentType = "application/x-www-form-urlencoded";
       string postData = "IMNumber=353323065370373&IPAddress=132.168.5.7";
       byte[] bytes = Encoding.UTF8.GetBytes(postData);
       request.ContentLength = bytes.Length;
       Stream requestStream = request.GetRequestStream();
       requestStream.Write(bytes, 0, bytes.Length);
       WebResponse response = request.GetResponse();
       Stream stream = response.GetResponseStream();
       StreamReader reader = new StreamReader(stream);
       var result = reader.ReadToEnd();
       stream.Dispose();
       reader.Dispose();