Could you elaborate on that? When i use standard authentication everything work fine but when i use custom authentication and authorization i can not work with WCF service. I get error from title. Is there a difference between custom authentication and authorization in .net 2.0 and net 3.5?

Another problem is that HtmlControl frame1 = (HtmlControl)this.FindControl("ifrCache"); return null but i add runat=server to ifrCache so i can use it like server control and it works. The same problem still persists. I do not know how to access to controls in iframe? Is it javascript solution? :((

Tnx Guffa. That's what i need. Does someone know how to convert .doc database binary data into image? I try set content type to application/image but it's not work.