Resumable upload using Webdav API

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IIS7

C#

IIS

I am developing a windows application that can upload files on a remote server and I am using Webdav api to upload my files. I am trying to implement the IResumableUpload. The upload of file is working fine but when I am resuming a broken upload,I always got FALSE return on this:

bool resumableUploadSupported = (resource.SupportedFeatures().Features & Features.ResumableUpload) != 0;

I am new to this and I cant find some good procedures on how to configure the resumable upload feature on Webdav. I followed the steps given here http://www.webdavsystem.com/client/programming/upload/resumable_upload. I cant get the right value of the size that was uploaded on the server before the stream was broken because the resource does not support IResumable. Am I missing some configuration here? Do I need some configuration on the server? Any help is appreciated.

Cheers!