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AutoSizeMode Enumeration

Specifies how a control will behave when its AutoSize property is enabled.

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

Public Enumeration AutoSizeMode

Member nameDescription
GrowAndShrinkThe control grows or shrinks to fit its contents. The control cannot be resized manually.
GrowOnlyThe control grows as much as necessary to fit its contents but does not shrink smaller than the value of its Size property. The form can be resized, but cannot be made so small that any of its contained controls are hidden.

Setting the GrowAndShrink value produces the same behavior that you get for controls with the AutoSize property enabled but which have no

AutoSizeMode property. The MinimumSize and MaximumSize properties are respected, but the current value of the Size property is ignored.

The following code example shows a form created using code that automatically resizes to fit its contents. When ran, the form will display a Label, a TextBox for entering a URL, and a Button for displaying that URL inside of the user's default Web browser. The code example uses a FlowLayoutPanel to lay out the contained controls one after the other, and sets the AutoSize and AutoSizeMode to grow and shrink to fit the contents of its form.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Me.AutoSize = True
    Me.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink
    Me.Text = "URL Opener"

    flowPanel = New FlowLayoutPanel()
    flowPanel.AutoSize = True
    flowPanel.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink

    urlLabel = New Label()
    urlLabel.Name = "urlLabel"
    urlLabel.Text = "URL:"
    urlLabel.Width = 50
    urlLabel.TextAlign = ContentAlignment.MiddleCenter

    urlTextBox = New TextBox()
    urlTextBox.Name = "urlTextBox"
    urlTextBox.Width = 250

    urlButton = New Button()
    urlButton.Name = "urlButton"
    urlButton.Text = "Open URL in Browser"
End Sub

Private Sub urlButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles urlButton.Click
        Dim newUri As New Uri(urlTextBox.Text)
    Catch uriEx As UriFormatException
        MessageBox.Show(("Sorry, your URL is malformed. Try again. Error: " + uriEx.Message))
        urlTextBox.ForeColor = Color.Red
    End Try

    ' Valid URI. Reset any previous error color, and launch the URL in the 
    ' default browser.
    ' NOTE: Depending on the user's settings, this method of starting the
    ' browser may use an existing window in an existing Web browser process.
    ' To get around this, start up a specific browser instance instead using one of
    ' the overloads for Process.Start. You can examine the registry to find the
    ' current default browser and launch that, or hard-code a specific browser.
    urlTextBox.ForeColor = Color.Black
End Sub

.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.