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Control.CheckForIllegalCrossThreadCalls Property

Gets or sets a value indicating whether to catch calls on the wrong thread that access a control's Handle property when an application is being debugged.

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

[BrowsableAttribute(false)]
public static bool CheckForIllegalCrossThreadCalls { get; set; }

Property Value

Type: System.Boolean
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 while debugging.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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