[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Opens an existing file for writing.
Assembly: mscorlib (in mscorlib.dll)
The caller does not have the required permission.
path specified a read-only file or directory.
path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by GetInvalidPathChars.
path is null.
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.
The specified path is invalid, (for example, it is on an unmapped drive).
The file specified in path was not found.
path is in an invalid format.