Build and send the multipart complete request

uploadfilestep3

//Step 3: build and send the multipart complete request
if (lastPart)
{
    eTags.Add(new PartETag
    {
        PartNumber = partNumber,
        ETag = uploadResponse.ETag
    });

    var completeRequest = new CompleteMultipartUploadRequest
    {
        BucketName = bucketName,
        Key = fileName,
        UploadId = uploadId,
        PartETags = eTags
    };

    var result = _s3Client.CompleteMultipartUpload(completeRequest);
    //Set the uploadId and fileURLs with the response.
    response = uploadRequest.UploadId + "|success|" + result.Location + "|";
    //For image get thumbnail url
    if (HasImageExtension(fileName.ToLower()))
    {
        //Send the Thumbnail URL
        response += result.Location.Replace(uploadRequest.Key, "thumbnail/" + uploadRequest.Key);
    } else
    {
        response += "";
    }
}
else
{
    eTags.Add(new PartETag
    {
        PartNumber = partNumber,
        ETag = uploadResponse.ETag
    });

    //Set the uploadId and eTags with the response
    response = uploadRequest.UploadId + "|" + GetAllETags(eTags);
}