public void BlockExample()
{
    // set up Linxter
    ILinxterMessaging messaging = new LinxterSDK();
    ILinxterCommunicationChannel channel = messaging as ILinxterCommunicationChannel;

    // block all requests sent from Bob's program
    foreach (ChannelRequestInfo item in channel.IncomingChannelRequests)
    {
        if (item.Sender.ProgramName.Equals("Bob's Program"))
        {
            channel.Block(item.Sender.ProgramInstanceId);
        }
    }
}

Public Sub BlockExample()
    ' set up Linxter
    Dim messaging As ILinxterMessaging = New LinxterSDK()
    Dim channel As ILinxterCommunicationChannel = TryCast(messaging, ILinxterCommunicationChannel)

    ' block all requests sent from Bob's program
    For Each item As ChannelRequestInfo In channel.IncomingChannelRequests
        If item.Sender.ProgramName.Equals("Bob's Program") Then
            channel.Block(item.Sender.ProgramInstanceId)
        End If
    Next item
End Sub