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Form.IsMdiChild Property

Gets a value indicating whether the form is a multiple-document interface (MDI) child form.

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

[BrowsableAttribute(false)]
public bool IsMdiChild { get; }

Property Value

Type: System.Boolean
true if the form is an MDI child form; otherwise, false.

At run time, MDI child forms are displayed inside the client area of an MDI parent form. An MDI child form can be maximized, minimized, and moved within the MDI parent form. To create an MDI child form, assign the Form that will be the MDI parent form to the MdiParent property of the child form. You can use the IsMdiContainer property to determine whether a form is an MDI parent form.

You can use the IsMdiChild property to determine whether a form returned by a method or property is an MDI child form or a standard form in your application such as a dialog box.

NoteNote

All MDI child forms have sizable borders, a control-menu box, and Minimize and Maximize buttons, regardless of the settings of the FormBorderStyle, ControlBox, MinimizeBox, and MaximizeBox properties.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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