Getting Started with Windows Forms ComboBoxAutoComplete(Classic)

10 Oct 20223 minutes to read

Implementing a simple ComboBoxAutoComplete can be done in the following ways.

Through Designer

This tutorial illustrates the usage of the ComboBoxAutoComplete control without any external datasource.


This is applicable only for VS2005.

  1. Drag-and-drop a ComboBoxAutoComplete control from the toolbox onto the form.

    Windows Forms ComboBoxAutoComplete Image39

  2. Add items to ComboBoxAutoComplete using AutoCompleteCustomSource collection editor as shown below.

    Windows Forms ComboBoxAutoComplete Image40

  3. Specify the text completion behavior of the control using ComboBoxAutoComplete.AutoCompleteMode. The value of AutoCompleteMode should not be none in this case. See Source for AutoComplete Control to know the different AutoCompleteModes.
  4. Set AutoCompleteSource to CustomSource as shown below. See Source for AutoComplete Control to know the different AutoComplete sources.

    Windows Forms ComboBoxAutoComplete Image41


At runtime, type ā€˜Cā€™ in the display area of ComboBoxAutoComplete, you will see the autocompletion behavior as shown below.


Through Code

The embedded AutoComplete control in a ComboBoxAutoComplete control is exposed through the AutoCompleteControl property. The Datasource property of the AutoCompleteControl specifies the data that will be used for the auto completion of the combo box. It can be created programmatically as follows.

  1. Include the required namespace.

    using Syncfusion.Windows.Forms.Tools;
    Imports Syncfusion.Windows.Forms.Tools
  2. Create an instance of the ComboBoxAutoComplete control class.

    private Syncfusion.Windows.Forms.Tools.ComboBoxAutoComplete comboBoxAutoComplete1;
    this.comboBoxAutoComplete1=new Syncfusion.Windows.Forms.Tools.ComboBoxAutoComplete();
    Private comboBoxAutoComplete1 As Syncfusion.Windows.Forms.Tools.ComboBoxAutoComplete
    Me.comboBoxAutoComplete1 = New Syncfusion.Windows.Forms.Tools.ComboBoxAutoComplete()
  3. Set data source and add the control to the form.

    this.comboBoxAutoComplete1.AutoCompleteCustomSource.AddRange(new string[] { "Custom", "Customizing", "Customizable"});
    this.comboBoxAutoComplete1.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend;
    this.comboBoxAutoComplete1.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.CustomSource;
    Me.comboBoxAutoComplete1.AutoCompleteCustomSource.AddRange(New String() {"Custom", "Customizing", "Customizable"}) 
    Me.comboBoxAutoComplete1.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend 
    Me.comboBoxAutoComplete1.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.CustomSource 
  4. Run the application.

    Windows Forms ComboBoxAutoComplete Image43