Implementing MultiSelectionComboBox

The MultiSelectionComboBox is a WinForms ComboBox control that supports multiple item selection and auto-suggestion. Selected items can be displayed as removable tag chips (VisualItem mode), comma-separated text (Delimiter mode), or single-value (Normal mode). It supports data binding via DataSource/DisplayMember/ValueMember, Office-style visual themes, grouping, and a rich event model.

When to Use This Skill

• Adding a multi-select dropdown to a Windows Forms application
• Displaying selected values as tag chips with close buttons
• Binding the combo box to a DataTable, DataView, or ArrayList
• Configuring auto-suggestion behavior (AutoSuggestMode)
• Grouping dropdown items by initial character
• Styling the drop-down list or visual item tags
• Handling selection change and visual item collection events

Documentation and Navigation Guide