Send Form Files To The Server Just To Get Summary Filesize Without Sending The Whole Files?

I have a form with 10 file inputs. They can contain 10 random files with random sizes. If I send these files to ASP.NET server with this code:

var count = HttpContext.Current.Request.Files.Count;
var TotalSize = 0;
for (int i = 0; i < count; i++ )
{
HttpPostedFile postedFile = HttpContext.Current.Request.Files.Get(i);
TotalSize += postedFile.ContentLength;
}

And as you can see I didn't save the files on the server, will this code just calculate the summary of files without need to receive the whole file from the client (And therefore it would be very fast)?