Control.CheckForIllegalCrossThreadCalls Property

Note: This property is new in the .NET Framework version 2.0.

Gets or sets a value indicating whether to catch calls on the wrong thread that access a control's Handle property.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in

public static bool CheckForIllegalCrossThreadCalls { get; set; }
/** @property */
public static boolean get_CheckForIllegalCrossThreadCalls ()

/** @property */
public static void set_CheckForIllegalCrossThreadCalls (boolean value)

public static function get CheckForIllegalCrossThreadCalls () : boolean

public static function set CheckForIllegalCrossThreadCalls (value : boolean)

Property Value

true if calls on the wrong thread are caught; otherwise, false.

When a thread other than the creating thread of a control tries to access one of that control's methods or properties, it often leads to unpredictable results. A common invalid thread activity is a call on the wrong thread that accesses the control's Handle property. Set CheckForIllegalCrossThreadCalls to true to find and diagnose this thread activity more easily.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0