# Active Property

A read-only property that returns a Boolean value that indicates whether the window associated with the Window object is the active window.

expression.Active

expression Required. An expression that returns a reference to the Window object.

## Security Level

0: Can be accessed without restrictions.

## Remarks

To designate a window as the active window, use the Activate method of the Window object.

## Example

In the following example, the Active property of the Window object is used to determine whether the first window contained in the Windows collection is the active window:

    if (Application.Windows(0).Active)
    {
       XDocument.UI.Alert("The window is active.");
    }

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