Release 10.1A: OpenEdge Development:
.NET Open Clients

> ## Passing a TABLE or TABLE-HANDLE as an INPUT-OUTPUT parameter

> `INPUT-OUTPUT` `TABLE` and `TABLE-HANDLE` parameters are a combination of `INPUT` and `OUTPUT` parameters. The client application must pass an object instance for the parameter as defined for input parameters. For a `TABLE` parameter, the client must provide an instance of the strongly typed DataTable class provided by ProxyGen. For a `TABLE-HANDLE` parameter, the client must provide a strongly typed DataTable (if applicable), an instance of `Progress.Open4GL.ProDataTable`, or an instance of `System.Data.DataTable` that contains both the schema and data. For more information, see the "Passing a TABLE or TABLE-HANDLE as an INPUT parameter" section.

> `OUTPUT` `TABLE-HANDLE` parameters can be returned as `Unknown` or undefined. As a result, you must ensure the client code is written to handle these cases.

> For `INPUT-OUTPUT` parameters, all the data must be put into the parameter before the proxy call is made. Any data in the parameter at the time of the method is replaced on return from the proxy call. All output data is immediately available to the client after the proxy call returns.

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