Gets or sets the mode by which the form automatically resizes itself.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Setting the 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 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.
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)