ComboBox.AutoCompleteMode Property

Gets or sets an option that controls how automatic completion works for the ComboBox.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public AutoCompleteMode AutoCompleteMode { get; set; }
/** @property */
public AutoCompleteMode get_AutoCompleteMode ()

/** @property */
public void set_AutoCompleteMode (AutoCompleteMode value)

public function get AutoCompleteMode () : AutoCompleteMode

public function set AutoCompleteMode (value : AutoCompleteMode)

Not applicable.

Property Value

One of the values of AutoCompleteMode. The values are AutoAppend, AutoSuggest, AutoSuggestAppend, and None. The default is None.

Exception typeCondition

InvalidEnumArgumentException

The specified value is not one of the values of AutoCompleteMode.

Use the AutoCompleteCustomSource, AutoCompleteMode, and AutoCompleteSource properties to create a ComboBox that automatically completes input strings by comparing the prefix being entered to the prefixes of all strings in a maintained source. This is useful for ComboBox controls in which URLs, addresses, file names, or commands will be frequently entered. If there are duplicate entries in the maintained source, automatic completion behaves unpredictably.

If you set ComboBoxStyle to DropDownList, the list displays only if AutoCompleteMode is Suggest or SuggestAppend.

The use of the AutoCompleteCustomSource property is optional, but you must set the AutoCompleteSource property to CustomSource in order to use AutoCompleteCustomSource.

You must use the AutoCompleteMode and AutoCompleteSource properties together.

With AutoCompleteMode set to SuggestAppend and AutoCompleteSource set to ListItems, the behavior is as follows:

  • If the list of strings is empty, pressing the BACKSPACE or DELETE key does nothing.

  • If the BACKSPACE key is pressed in less than one second, the previous item is selected, or nothing is selected if the list of string is empty.

  • If the BACKSPACE key is pressed in more than one second, the first item is selected.

  • If the DELETE key is pressed, the first item is selected.

NoteNote:

The operating system might limit the number of custom strings that it can display at once. For strings that contain a forward slash (/) or backward slash (\), automatic completion appends all characters only up to and including the slash.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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