ASP.NET

private string SubmitCreateNewHireWorkflowStatus(string strStatusXml, string servicePath)
        {
            WebRequest request = HttpWebRequest.Create("https://staging.xxxx.com/pa/vendorCheckXXXXXXXXXXXXX.do");
            request.Method = "POST";
            request.ContentLength = strStatusXml.Length;
            request.ContentType = "application/x-www-form-urlencoded";

            Stream str = request.GetRequestStream();
            System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
            byte[] byteStatusXml = encoding.GetBytes(strStatusXml);

            string result = "";

            str.Write(byteStatusXml, 0, strStatusXml.Length);
            str.Flush();
            try
            {
                WebResponse response = request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream());
                result = reader.ReadToEnd();
            }
            catch (Exception exception)
            {
                string strException = exception.Message;
            }

            return (result == null) ? "" : result;
}

System.IO.File.Create("file.txt");

private void ExporttoExcel(string xmlPath)
       {

           HttpResponse response = HttpContext.Current.Response;

           // first let's clean up the response.object
           response.Clear();
           response.Charset = "";
           // set the response mime type for excel
           response.ContentType = "application/ms-excel";

           DataSet xportdata = new DataSet();
           xportdata.ReadXml(xmlPath);

           if (xportdata != null)
           {
               if (xportdata.Tables.Count > 0)
               {
                   if (xportdata.Tables[0].Rows.Count > 0)
                   {

                       StringWriter sw = new StringWriter();
                       HtmlTextWriter htw = new HtmlTextWriter(sw);
                       GridView gv = new GridView();
                       gv.DataSource = xportdata.Tables[0];
                       gv.DataBind();
                       gv.RenderControl(htw);
                       Response.Write(sw.ToString());
                       Response.End();
                   }
                   else
                   {
                       lblErrorMessage.Text = "No Records Found.";
                   }
               }
               else
               {
                   lblErrorMessage.Text = "No Records Found.";
                   Response.Flush();
                   //Response.End();
               }
           }
       }