I have a WCF service that is hosted inside a Windows Form.
How can I access the controls of the form from the methods in my service?
for example I have
Use a delegate. Create a delegate in the codebehind of your form which references a method that writes to the textbox and pass it to the Service, the service can then invoke the delegate when it wants to print a message.
You will have issues trying to update the textbox because the delegate will be invoked on a different thread to that which the textbox was created on. In the WPF world you would use Dispatcher.BeginInvoke to get around this, not sure what the WinForms equivalent is.