I created a custom client formatter sink to pass some information. I can
create it as follows:

BinaryClientFormatterSinkProvider binarySink = new
BinaryClientFormatterSinkProvider();
ClientSecuritySinkProvider secureSink = new
ClientSecuritySinkProvider(username, password);
secureSink.Next = binarySink;
_tcpChannel = new TcpClientChannel("tcp", secureSink);

ChannelServices.RegisterChannel(_tcpChannel);

This works the first time. However, if I call:
ChannelServices.RegisterChannel(_tcpChannel);

and then reexecute the code with a different username and password, the
first channel is still being used although I unregistered it! I verified
that the new channel is being created with a new username and password. So,
for some reason, the first created channel continues to be used.

What could I be doing wrong? The only way I can stop using the original
channel is to restart my application.

Thanks,
Gary H

Also, to be clear. I am performing:
Activator.GetObject(...) after the RegisterChannel call. And, I am
performing a ChannelServices.UnregisterChannel(_tcpChannel) before
registering the channel again.

I did further searching on Google and found another person reported this
probably way back in .NET 1.0 but there was no response to him. I am
currently using .NET 2.0.