FileSystemWatcher Constructor (String, String)

FileSystemWatcher Constructor (String, String)


Initializes a new instance of the FileSystemWatcher class, given the specified directory and type of files to monitor.

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

public FileSystemWatcher(
	string path,
	string filter


Type: System.String

The directory to monitor, in standard or Universal Naming Convention (UNC) notation.

Type: System.String

The type of files to watch. For example, "*.txt" watches for changes to all text files.

Exception Condition

The path parameter is null.


The filter parameter is null.


The path parameter is an empty string ("").


The path specified through the path parameter does not exist.


path is too long.


The component will not watch the specified directory until the Path is set, and EnableRaisingEvents is true.

The component can watch files on your personal computer, a network drive, or a remote computer.

You cannot watch a remote computer that does not have Windows NT or Windows 2000. You cannot watch a remote Windows NT 4.0 computer from a Windows NT 4.0 computer.


for full trust for the immediate caller. This member cannot be used by partially trusted code.

.NET Framework
Available since 1.1
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