This was very interesting error, I got during development of file upload control in ASP.NET.
On my local system, every thing was just fine. but when I deployed my application on development server, my control was able to upload only small size files.
Whenever I tried to upload large size file i got error “cannot access a closed file”.
After going through MSDN I found that there is one new element added in ASP.NET 2.0 known as httpRuntime.
So I just added this new Tag in my web.config and every thing was right.
<httpRuntime maxRequestLength=”15360″ requestLengthDiskThreshold=”15360″/>