I am getting the message "CS0016: Could not write to output file 'c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Temporary ASP.NET Files\application1\c11b43f6\cf3ec03\rizcntet.dll' . The directory name is invalid."

The system TEMP and TMP variables point to a folder that does not exist. The compiler generates temporary files in the folder where the TEMP and the TMP variables point to before the files are copied to the Temporary ASP.NET Files folder. However, the folder where the system variables point to is deleted when you restart the computer. Therefore, the compiler cannot generate the temporary files.

RESOLUTION

Create a temporary folder under %Systemroot%, and then name it Temp.
Grant full permissions on the Temp folder to the aspnet user account in .NET Framework 1.0 or to the NETWORK SERVICE user account in .NET Framework 1.1.
Right-click My Computer, and then click Properties.
On the Advanced tab, click Environment Variables.
Select the TEMP variable under System variables, and then click Edit.
Type %SystemRoot%\TEMP in the Variable Value box, and then click OK.
Repeat steps 5 and 6 to edit the TMP variable. Click OK two times.
Click Start, and then click Run.
To reset Internet Information Services (IIS), type iisreset on the command prompt.

Note If the error message that is mentioned in the "Symptoms" section of this article persists, restart the computer.