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File.WriteAllText Method (String, String)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When it is called by trusted applications, creates a new file, writes the specified string to the file, and then closes the file. If the target file already exists, it is overwritten.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Sub WriteAllText ( _
    path As String, _
    contents As String _
)

[SecuritySafeCriticalAttribute]
public static void WriteAllText(
    string path,
    string contents
)

Parameters

Exceptions

Exception Condition
ArgumentException

path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by GetInvalidPathChars.
ArgumentNullException

path is nulla null reference (Nothing in Visual Basic).
PathTooLongException

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.
DirectoryNotFoundException

The specified path is invalid (for example, it is on an unmapped drive).
IOException

An I/O error occurred while opening the file.
UnauthorizedAccessException

path specified a file that is read-only.

-or-

This operation is not supported on the current platform.

-or-

path specified a directory.

-or-

The caller does not have the required permission.
FileNotFoundException

The file specified in path was not found.
NotSupportedException

path is in an invalid format.
SecurityException

The caller does not have the required permission.

Remarks

For more information about trusted applications, see Trusted Applications.

Version Information

Silverlight

Supported in: 5, 4

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.