A task was canceled when downloading large files.

In my .net(C#) application I am trying to download the files from the dropbox using dropbox client and its working fine with the small files like 10mb but when i try to download larger files then its giving me the "A task was canceled." and i think this exception is related to timeout.How can i solve this issue beacuse i have to download files upto 5's to 10 gb? I am using following code

DropboxClient dbx = new DropboxClient(user.DropboxAccessToken);

using (var response = await dbx.Files.DownloadAsync(@"" + "/" + file))
{
var ufile =await response.GetContentAsStreamAsync();
}