WebClient::OpenWrite Method (Uri^, String^)


Opens a stream for writing data to the specified resource, by using the specified method.

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

Stream^ OpenWrite(
	Uri^ address,
	String^ method


Type: System::Uri^

The URI of the resource to receive the data.

Type: System::String^

The method used to send the data to the resource. If null, the default is POST for http and STOR for ftp.

Return Value

Type: System.IO::Stream^

A Stream used to write data to the resource.

Exception Condition

The address parameter is null.


The URI formed by combining BaseAddress, and address is invalid.


An error occurred while opening the stream.

The OpenWrite method returns a writable stream that is used to send data to a resource. This method blocks while opening the stream. To continue executing while waiting for the stream, use one of the OpenWriteAsync 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 member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

.NET Framework
Available since 2.0
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