WebClient.DownloadFile Method (Uri, String)

Note: This method is new in the .NET Framework version 2.0.

Downloads the resource with the specified URI to a local file.

Namespace: System.Net
Assembly: System (in system.dll)

public void DownloadFile (
	Uri address,
	string fileName
public void DownloadFile (
	Uri address, 
	String fileName
public function DownloadFile (
	address : Uri, 
	fileName : String



The URI specified as a String, from which to download data.


The name of the local file that is to receive the data.

Exception typeCondition


The URI formed by combining BaseAddress and address is invalid.


filename is a null reference (Nothing in Visual Basic) or Empty.


The file does not exist.


An error occurred while downloading data.


The method has been called simultaneously on multiple threads.

The DownloadFile method downloads to a local file data from the URI specified by in the address parameter. This method blocks while downloading the resource. To download a resource and continue executing while waiting for the server's response, use one of the DownloadFileAsync methods.

If the BaseAddress property is not an empty string ("") and address does not contain an absolute URI, address must be a relative URI that is combined with BaseAddress to form the absolute URI of the requested data. If the QueryString property is not an empty string, it is appended to address.

This method uses the RETR command to download an FTP resource. For an HTTP resource, the GET method is used.


This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

When using this method in a middle tier application, such as an ASP.NET page, you will receive an error if the account under which the application executes does not have permission to access the file.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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