Connection groups associate a set of requests with a particular connection or set of connections. The connections in a connection group can be reused only by requests originating in the same application domain, when the credentials on the request are the same and the request specifies the connection group name. When a request does not specify a connection group name, any existing connection to the requested server that is not associated with a connection group can be used. When the credentials are not the same, the existing connection is closed and the new request must be reauthenticated.

Using connection groups can improve performance because this allows all of the requests for a user to reuse the connection authenticated with the user's credentials.

Changing the ConnectionGroupName property after calling the GetRequestStream, BeginGetRequestStream, GetResponse, or BeginGetResponse method causes an InvalidOperationException exception.

The following code example retrieves the value of this property.

Dim proxy As IWebProxy = request.Proxy
If proxy IsNot Nothing Then
    Console.WriteLine("Proxy: {0}", proxy.GetProxy(request.RequestUri))
Else
    Console.WriteLine("Proxy: (none)")
End If

Console.WriteLine("ConnectionGroup: {0}", If(request.ConnectionGroupName Is Nothing, "none", request.ConnectionGroupName))

IWebProxy proxy = request.Proxy;
if (proxy != null)
{
    Console.WriteLine("Proxy: {0}", proxy.GetProxy(request.RequestUri));
} 
else
{
    Console.WriteLine("Proxy: (none)");
}

Console.WriteLine("ConnectionGroup: {0}",
    request.ConnectionGroupName == null ? "none" : request.ConnectionGroupName
);

IWebProxy^ proxy = request->Proxy;
if ( proxy )
{
   Console::WriteLine( "Proxy: {0}", proxy->GetProxy( request->RequestUri ) );
}
else
{
   Console::WriteLine( "Proxy: (none)" );
}

Console::WriteLine( "ConnectionGroup: {0}", request->ConnectionGroupName == nullptr ? "none" : request->ConnectionGroupName );

.NET Framework

.NET Framework Client Profile

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

Reference

Other Resources