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WebException Constructor (String)

Initializes a new instance of the WebException class with the specified error message.

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

'Declaration
Public Sub New ( _
	message As String _
)
'Usage
Dim message As String

Dim instance As New WebException(message)
public WebException (
	String message
)
public function WebException (
	message : String
)

Parameters

message

The text of the error message.

The WebException instance is initialized with the Message property set to the value of message. If message is a null reference (Nothing in Visual Basic), the Message property is initialized to a system-supplied message. The InnerException and Response properties are initialized to a null reference (Nothing in Visual Basic). The Status property is initialized to RequestCanceled.

The following example throws a WebException by specifying an error message.


Try
    ' A 'Socket' object has been created.
    Dim httpSocket As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
    
    ' The IPaddress of the unknown uri is resolved using the 'Dns.Resolve' method. 
      
    Dim hostEntry As IPHostEntry = Dns.Resolve(connectUri)
    
    Dim serverAddress As IPAddress = hostEntry.AddressList(0)
    Dim endPoint As New IPEndPoint(serverAddress, 80)
    httpSocket.Connect(endPoint)
    Console.WriteLine("Connection created successfully")
    httpSocket.Close()
Catch e As SocketException
    Console.WriteLine((ControlChars.Cr + "Exception thrown." + ControlChars.Cr + "The Original Message is: " + e.Message))
    ' Throw the 'WebException' object with a message string specific to the situation.
    Throw New WebException("Unable to locate the Server with 'www.contoso.com' Uri.")
End Try

try {
    // A 'Socket' object has been created.
    Socket httpSocket = new Socket(AddressFamily.InterNetwork,
        SocketType.Stream, ProtocolType.Tcp);
    // The IPaddress of the unknown uri is resolved using the 
    // 'Dns.Resolve' method. 
    IPHostEntry hostEntry = Dns.Resolve(connectUri);
    IPAddress serverAddress = (IPAddress)hostEntry.
        get_AddressList().get_Item(0);
    IPEndPoint endPoint = new IPEndPoint(serverAddress, 80);
    httpSocket.Connect(endPoint);
    Console.WriteLine("Connection created successfully");
    httpSocket.Close();
}
catch (SocketException e) {
    Console.WriteLine("\nException thrown.\nThe Original Message is: " 
        + e.get_Message());
    // Throw the 'WebException' object with a message string 
    // specific to the situation.
    throw new WebException("Unable to locate the Server with" 
        + " 'www.contoso.com' Uri.");
}

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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