The System.Windows.Forms.PreviewKeyDownEventArgs class is used in C# to provide data for the PreviewKeyDown event of a Windows Forms control. It contains information about the key that was pressed, such as the corresponding key code and modifiers. This class allows developers to handle and process key events before they are sent to the control for normal processing. By using the properties and methods provided by this class, developers can perform custom actions based on the specific keys that were pressed.
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