Add Page Number Field into Document Uploaded at Amazon S3 Storage

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SaasposeApp.AppKey = "9a******************";
SaasposeApp.AppSID = "77*********************";
            //specify product URI
            Product.BaseProductUri = @"http://api.saaspose.com/v1.0";
            
            try
            {
                string fileName = "Sample.doc";
                string saveFormat = "doc";
                string outputFile = "C:\\Output." + saveFormat;
                string amazonS3StorageName = "MyAmazonS3Storage";
                string amazonS3BucketName = "MyS3Bucket"; // include folder name if file is not at root folder 

                //serialize the JSON request content
                Field field = new Field();
                field.Alignment = "right";
                field.Format = "{PAGE} of {NUMPAGES}";
                field.IsTop = true;
                field.SetPageNumberOnFirstPage = true;

                string strJSON = JsonConvert.SerializeObject(field);

                //build URI
                string strURI = Product.BaseProductUri + "/words/" + fileName + "/insertPageNumbers";
                strURI += "?storage=" + amazonS3StorageName + "&folder=" + amazonS3BucketName;
                //sign URI
                string signedURI = Sign(strURI);
                //get response stream
                Stream responseStream = ProcessCommand(signedURI, "POST", strJSON, "json");
                //build URI
                strURI = Product.BaseProductUri + "/words/" + fileName;
                strURI += "?format=" + saveFormat + "&storage=" + amazonS3StorageName + "&folder=" + amazonS3BucketName; ;

                //sign URI
                signedURI = Sign(strURI);
                //get response stream
                responseStream = ProcessCommand(signedURI, "GET");

                using (Stream fileStream = System.IO.File.OpenWrite(outputFile))
                {
                    CopyStream(responseStream, fileStream);
                }
                responseStream.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }  
   public static string Sign(string url)
    {
        try
        {
            UriBuilder builder = new UriBuilder(url);
            if (builder.Query != null && builder.Query.Length > 1)
                builder.Query = builder.Query.Substring(1) + "&appSID=" + SaasposeApp.AppSID;
            else
                builder.Query = "appSID=" + SaasposeApp.AppSID;
                builder.Path = builder.Path.TrimEnd('/');
            byte[] privateKey = System.Text.Encoding.UTF8.GetBytes(SaasposeApp.AppKey);

            System.Security.Cryptography.HMACSHA1 algorithm = new System.Security.Cryptography.HMACSHA1(privateKey);
            byte[] sequence = System.Text.ASCIIEncoding.ASCII.GetBytes(builder.Uri.AbsoluteUri);
            byte[] hash = algorithm.ComputeHash(sequence);
            string signature = Convert.ToBase64String(hash);
            signature = signature.TrimEnd('=');
            signature = System.Web.HttpUtility.UrlEncode(signature);
            signature = System.Text.RegularExpressions.Regex.Replace(signature, "%[0-9a-f]{2}", e => e.Value.ToUpper());
     return string.Format("{0}&signature={1}", builder.Uri.AbsoluteUri, signature);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }

    public static Stream ProcessCommand(string strURI, string strHttpCommand)
    {
        try
        {
            Uri address = new Uri(strURI);
            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(address);
            request.Method = strHttpCommand;
            request.ContentType = "application/json";

            request.ContentLength = 0;
            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
            return response.GetResponseStream();
        }
        catch (System.Net.WebException webex)
        {
            throw new Exception(webex.Message);
        }
        catch (Exception Ex)
        {
            throw new Exception(Ex.Message);
        }
    }

   public static Stream ProcessCommand(string strURI, string strHttpCommand, string strContent, string ContentType = "xml")
    {
        try
        {
            byte[] arr = System.Text.Encoding.UTF8.GetBytes(strContent);

            Uri address = new Uri(strURI);
            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(address);
            request.Method = strHttpCommand;
            if (ContentType.ToLower() == "xml")
                request.ContentType = "application/xml";
            else
                request.ContentType = "application/json";

            request.ContentLength = arr.Length;

            Stream dataStream = request.GetRequestStream();
            dataStream.Write(arr, 0, arr.Length);
            dataStream.Close();

            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
            return response.GetResponseStream();
        }
        catch (System.Net.WebException webex)
        {
            throw new Exception(webex.Message);
        }
        catch (Exception Ex)
        {
            throw new Exception(Ex.Message);
        }
    }
    public static void CopyStream(Stream input, Stream output)
    {
        try
        {
            byte[] buffer = new byte[8 * 1024];
            int len;
            while ((len = input.Read(buffer, 0, buffer.Length)) > 0)
            {
                output.Write(buffer, 0, len);
            }
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
    }
}

public class Product
{
   public static string BaseProductUri { get; set; }
}
public class SaasposeApp
{
    public static string AppSID { get; set; }
    public static string AppKey { get; set; }
}
public class Field
{
    public string Format { get; set; }
    public string Alignment { get; set; }
    public bool IsTop { get; set; }
    public bool SetPageNumberOnFirstPage { get; set; }
}

Tags:
• Add page number field to Word doc
• build URI to insert page
• get response stream
• insert page number at Amazon S3 storage
• insert page number field in word file
• upload file to Amazon S3 storage