WebClient.Download() exception: Access to the path

I have a very simply code of:

WebClient webClient = new WebClient();
webClient.DownloadFile(privateHTML, @"\\192.168.0.12\imagedepot\AT" + carID + ".jpeg");

However, i get the error:

Access to the path '\\192.168.0.12\imagedepot\AT296866482.jpeg' is denied.

I can browse this folder from my machine (same one this app runs on), right click and create new text file. The target is a windows 2008 server. Any ideas? That folder share is set to everyone with full.

When I change \192.168.0.12\im开发者_运维知识库agedepot to be a mapdrive of Z:\ i get.

Could not find a part of the path 'Z:\AT294577469.jpeg'

Any ideas?

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EDIT after comment:

Then this is perhaps a permissions/rights issue... what sort of application is it ? WinForms ? Windows Service ? ASP.NET ?

EDIT 2:

Now that it is clarified by the OP (see comments) that it is a Windows Service the problem is clear:
Accsessing Network drives/UNC paths from a service is definitely a permissions/rights issue as Service is usually NOT allwed to access a network share and/or a mapped drive!

see Map a network drive to be used by a service