File creation

The folder name is too long PathTooLongException class. The folder name is only a colon, ":" PathTooLongException class. An instance of the SecurityException class may be thrown in partial-trust situations. If you don't have permission to create the folder, the example throws an instance of the UnauthorizedAccessException class. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. It is a free tool that can identify more than 11, different kinds of files - most likely yours too!

It will help you find software that can handle your specific type of file. Download File Analyzer here. Update info Upload example file. The Write method of FileStream can be used to write text to the file. The FileInfo. Here is a recommended article: Use FileInfo class in C to work with files. View All. Create a Text File in C. Mahesh Chand Updated date Jan 16, Create File. CreateText FileInfo.

Create FileInfo. CreateText File. Privacy policy. The CreateFile function can create a new file or open an existing file. You must specify the file name, creation instructions, and other attributes. When an application creates a new file, the operating system adds it to the specified directory. The operating system assigns a unique identifier, called a handle , to each file that is opened or created using CreateFile.

An application can use this handle with functions that read from, write to, and describe the file. It is valid until all references to that handle are closed. When an application starts, it inherits all open handles from the process that started it if the handles were created as inheritable.

An application should check the value of the handle returned by CreateFile before attempting to use the handle to access the file. When an application uses CreateFile , it must use the dwDesiredAccess parameter to specify whether it intends to read from the file, write to the file, both read and write, or neither.

This is known as requesting an access mode. The application must also use the dwCreationDisposition parameter to specify what action to take if the file already exists, known as the creation disposition.

Whether this succeeds or not depends on factors such as the previous file's attributes and security settings see the following sections for more information. An application also uses CreateFile to specify whether it wants to share the file for reading, writing, both, or neither. This is known as the sharing mode.