public void AddSubProtocol(string subProtocol)
{
ThrowIfReadOnly();
WebSocketHelpers.ValidateSubprotocol(subProtocol);
// Duplicates not allowed.
foreach (string item in requestedSubProtocols)
{
if (string.Equals(item, subProtocol, StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(SR.GetString(SR.net_WebSockets_NoDuplicateProtocol, subProtocol),
"subProtocol");
}
}
requestedSubProtocols.Add(subProtocol);
}
