Gets an array of forms that represent the multiple-document interface (MDI) child forms that are parented to this form.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
This property allows you to obtain references to all the MDI child forms currently opened in an 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 this property to loop through all the MDI child forms to perform operations such as saving data to a database when the MDI parent form closes or to update fields on the child forms based on actions performed in your application.
The following code example demonstrates how to use the property to iterate through the list of MDI child forms and add a Button control to each.
Private Sub AddButtonsToMyChildren() ' If there are child forms in the parent form, add Button controls to them. Dim x As Integer For x = 0 To (Me.MdiChildren.Length) - 1 ' Create a temporary Button control to add to the child form. Dim tempButton As New Button() ' Set the location and text of the Button control. tempButton.Location = New Point(10, 10) tempButton.Text = "OK" ' Create a temporary instance of a child form (Form 2 in this case). Dim tempChild As Form = CType(Me.MdiChildren(x), Form) ' Add the Button control to the control collection of the form. tempChild.Controls.Add(tempButton) Next x End Sub 'AddButtonsToMyChildren