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WebClient Constructor

Initializes a new instance of the WebClient class.

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

Public Sub New

The default constructor creates a new instance of the WebClient class. The default HTTP method is GET. The default FTP method is RETR. The default Encoding is Default. The default value of AllowAutoRedirect is true.

The following code example creates a WebClient instance and then uses it to download data from a server and display it on the system console, to download data from a server and write it to a file, and to upload form values to a server and receive the response.

    Public Shared Sub Main()

            Dim client As New WebClient()
            Dim pageData As [Byte]() = client.DownloadData("")
            Dim pageHtml As String = Encoding.ASCII.GetString(pageData)

            ' Download the data to a buffer.

            ' Download the data to a file.
            client.DownloadFile("", "page.htm")

            ' Upload some form post values.
            dim form as New NameValueCollection()
			   form.Add("MyName", "MyValue")  

			   ' Note that you need to replace "http://localhost/somefile.aspx" with the name of 
			   ' a file that is available to your computer.
			   Dim responseData As [Byte]() = client.UploadValues("", form)      

        Catch webEx As WebException
            if webEx.Status = WebExceptionStatus.ConnectFailure then
               Console.WriteLine("Are you behind a firewall?  If so, go through the proxy server.")
            end if
        End Try

    End Sub 'Main

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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