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The most effective method to retrieve a control's current value during execution is through the use of a Property Node. Property Nodes allow you to access various properties of a control or indicator, including the current value, at any point during the execution of a VI (Virtual Instrument). This provides a direct and efficient means to read the property without needing additional complexity.

When using a Property Node, you can configure it in the block diagram to read the specific property you are interested in, such as the Value property for controls. This method is typically more straightforward and maintains a clear and organized block diagram, as it allows for focused access to properties without affecting the overall flow of data in your applications.

While Local Variables and Functional Global Variables can also be used to access current values, they introduce additional considerations related to data flow and potential race conditions in a multithreaded environment. Local Variables can lead to unintended consequences if not managed carefully, and Functional Global Variables may complicate the design. Additionally, using an Event Structure has the benefit of responding to user actions but is not primarily intended for simply retrieving a value; it's geared more towards event handling.

Thus, Property Nodes stand out as the most effective and reliable method for retrieving control values during execution in LabVIEW development