Assembly: mscorlib (in mscorlib.dll)
fileName is null.
The caller does not have the required permission.
The file name is empty, contains only white spaces, or contains invalid characters.
Access to fileName is denied.
The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.
fileName contains a colon (:) in the middle of the string.
Silverlight for Windows PhoneThis member has a SecurityCriticalAttribute attribute on Silverlight for Windows Phone, because the attribute was present in Silverlight 3. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.