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Form.AutoSizeMode Property

Gets or sets the mode by which the form automatically resizes itself.

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

'Declaration
<BrowsableAttribute(True)> _
Public Property AutoSizeMode As AutoSizeMode

Property Value

Type: System.Windows.Forms.AutoSizeMode
An AutoSizeMode enumerated value. The default is GrowOnly.

ExceptionCondition
InvalidEnumArgumentException

The value is not a valid AutoSizeMode value.

Setting the AutoSizeMode property to a new value causes the form to be laid out again.

A form does not automatically resize in the Visual Studio forms designer, regardless of the values of the AutoSize and AutoSizeMode properties. The form correctly resizes itself at run time according to the values of these two properties. By contrast, a custom UserControl automatically resizes itself both at design time and at run time.

The following code example shows a form created using code that automatically resizes to fit its contents. When run, the form displaya 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. It also 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
    Me.Controls.Add(flowPanel)

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

    urlTextBox = New TextBox()
    urlTextBox.Name = "urlTextBox"
    urlTextBox.Width = 250
    flowPanel.Controls.Add(urlTextBox)

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


Private Sub urlButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles urlButton.Click
    Try 
        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
        Return 
    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
    Process.Start(urlTextBox.Text)
End Sub

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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