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Form Constructor

Initializes a new instance of the Form class.

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

Public Sub New

The default size of a form is 300 pixels in height and 300 pixels in width.

The following code example creates a new instance of a Form and calls the ShowDialog method to display the form as a dialog box. The example sets the FormBorderStyle, AcceptButton, CancelButton, MinimizeBox, MaximizeBox, and StartPosition properties to change the appearance and functionality of the form to a dialog box. The example also sets uses the Add method of the form's Controls collection to add two Button controls. The example uses the HelpButton property to display a help button in the caption bar of the dialog box.

Public Sub CreateMyForm()
    ' Create a new instance of the form. 
    Dim form1 As New Form()
    ' Create two buttons to use as the accept and cancel buttons. 
    Dim button1 As New Button()
    Dim button2 As New Button()

    ' Set the text of button1 to "OK".
    button1.Text = "OK" 
    ' Set the position of the button on the form.
    button1.Location = New Point(10, 10)
    ' Set the text of button2 to "Cancel".
    button2.Text = "Cancel" 
    ' Set the position of the button based on the location of button1.
    button2.Location = _
       New Point(button1.Left, button1.Height + button1.Top + 10)
    ' Set the caption bar text of the form.   
    form1.Text = "My Dialog Box" 
    ' Display a help button on the form.
    form1.HelpButton = True 

    ' Define the border style of the form to a dialog box.
    form1.FormBorderStyle = FormBorderStyle.FixedDialog
    ' Set the MaximizeBox to false to remove the maximize box.
    form1.MaximizeBox = False 
    ' Set the MinimizeBox to false to remove the minimize box.
    form1.MinimizeBox = False 
    ' Set the accept button of the form to button1.
    form1.AcceptButton = button1
    ' Set the cancel button of the form to button2.
    form1.CancelButton = button2
    ' Set the start position of the form to the center of the screen.
    form1.StartPosition = FormStartPosition.CenterScreen

    ' Add button1 to the form.
    ' Add button2 to the form.

    ' Display the form as a modal dialog box.
End Sub

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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