Cs0016: failed to write the output file "c:" WINDOWS "Microsoft. NET "Framework" v2.0.50727 "Temp problem cs0016: failed to write the output file" c: "WINDOWS" Microsoft. NET "Framework" v2.0.50727 "Temporary ASP. NET Files "root ".... "*. dll -- "Access Denied" c: \ windows \ temp directory access permission can be granted to IIS_IUSERS to modify the permission. The permission assigned to c: \ windows \ temp NetworkService on the internet is incorrect. Www.2cto.com grants the ASP net user account full control permissions in. NET Framework 1.0 or for the Temp folder, the network service. net Framework 1.1 user account. Right-click my computer and click Properties. On the Advanced tab, click environment variables. Select system variables and TEMP variables, and click Edit. Type % SystemRoot % \ TEMP in the variable value box, and then click OK. Repeat steps 5th and 6th to edit the TMP variable. Click OK twice. Click Start, and then click Run. To Reset Internet Information Services (IIS), type iisreset at the command prompt.