Release 10.1A: OpenEdge Development:
.NET Open Clients

Thread control property

The AppServer can be accessed from a multi-threaded client. However, the AppServer itself is not multi-threaded. As a result, only one request can be serviced at a time. If a method is made from the client while another one is still running on the AppServer, the application can decide which of the following should happen:

The second call can be queued and executed when the AppServer becomes available.
The client can get an exception.

The application can set the run-time properties to do either and can switch the setting at any time. The default is to throw an exception (WaitIfBusy=false).

The property in Table 5–3 provides thread control to the Open Client Runtime. For a detailed description of this property, see the "Alphabetical listing of properties" section.

Table 5–3: Thread control property

Property	Description/Property
WaitIfBusy	Sets and gets PROGRESS.Session.WaitIfBusy.