Control.Invalidate Method (Region, Boolean) (System.Windows.Forms)

Invalidate Method (Region, Boolean)

.NET Framework Class Library

Control..::.Invalidate Method (Region, Boolean)

Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control.

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

Syntax

Visual Basic (Declaration)

Public Sub Invalidate ( _
    region As Region, _
    invalidateChildren As Boolean _
)

Visual Basic (Usage)

Dim instance As Control
Dim region As Region
Dim invalidateChildren As Boolean

instance.Invalidate(region, invalidateChildren)

public void Invalidate(
    Region region,
    bool invalidateChildren
)

Visual C++

public:
void Invalidate(
    Region^ region, 
    bool invalidateChildren
)

JScript

public function Invalidate(
    region : Region, 
    invalidateChildren : boolean
)

Parameters

region: Type: System.Drawing..::.Region
The Region to invalidate.

invalidateChildren: Type: System..::.Boolean
true to invalidate the control's child controls; otherwise, false.

Remarks

Calling the Invalidate method does not force a synchronous paint; to force a synchronous paint, call the Update method after calling the Invalidate method. When this method is called with no parameters, the entire client area is added to the update region.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

Control Class

Control Members

Invalidate Overload

System.Windows.Forms Namespace

Refresh

Update