This documentation is archived and is not being maintained.

MaskedTextBox.InsertKeyMode Property

Gets or sets the text insertion mode of the masked text box control.

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

public InsertKeyMode InsertKeyMode { get; set; }

Property Value

Type: System.Windows.Forms.InsertKeyMode
An InsertKeyMode value that indicates the current insertion mode. The default is Default.


An invalid InsertKeyMode value was supplied when setting this property.

The InsertKeyMode property controls the character insertion behavior of the MaskedTextBox control. The state of this property is defined by the InsertKeyMode enumeration, which can be always on, always off or set to respect the setting of the user's keyboard. This property supersedes the insertion mode of the keyboard. For example, if the keyboard is set to overwrite, but InsertKeyMode is set to Insert, the MaskedTextBox will operate in insert mode. The IsOverwriteMode property will access the true insertion mode of the MaskedTextBox.

If changing InsertKeyMode changes the value of IsOverwriteMode, MaskedTextBox will raise the IsOverwriteModeChanged event.

This property has no effect if no mask has been set.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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