What is the use of AutoSizeMode in the WinForms MultiSelectionComboBox?

AutoSizeMode

The AutoSizeMode helps you to adjust the size of the MultiSelectionComboBox according to your requirement, when its selection mode is set to VisualItem. There are three types of AutoSizeMode.

1. None.
2. Vertical.
3. Horizontal.

None - The AutoSizeModes.None allows you to specify the default size of the MultiSelectionComboBox.

Vertical - The AutoSizeModes.Vertical allows you to adjust the size with respect to height, based on the items of the MultiSelectionComboBox.

Horizontal - The AutoSizeModes.Horizontal allows you to adjust the size with respect to width, based on the items of the MultiSelectionComboBox.

C#

//Sets the AutoSizeMode to None.
this.multiSelectionComboBox1.AutoSizeMode = Syncfusion.Windows.Forms.Tools.AutoSizeModes.None;
//Sets the AutoSizeMode to Vertical.
this.multiSelectionComboBox1.AutoSizeMode = Syncfusion.Windows.Forms.Tools.AutoSizeModes.Vertical;
//Sets the AutoSizeMode to Horizontal.
this.multiSelectionComboBox1.AutoSizeMode = Syncfusion.Windows.Forms.Tools.AutoSizeModes.Horizontal;

VB

'Sets the AutoSizeMode to None.
Me.multiSelectionComboBox1.AutoSizeMode = Syncfusion.Windows.Forms.Tools.AutoSizeModes.None
'Sets the AutoSizeMode to Vertical.
Me.multiSelectionComboBox1.AutoSizeMode = Syncfusion.Windows.Forms.Tools.AutoSizeModes.Vertical
'Sets the AutoSizeMode to Horizontal.
Me.multiSelectionComboBox1.AutoSizeMode = Syncfusion.Windows.Forms.Tools.AutoSizeModes.Horizontal

Figure 1: MultiSelectionComboBox specified with AutoSizeMode as None

Figure 2: MultiSelectionComboBox specified with AutoSizeMode as Vertical

Figure 3: MultiSelectionComboBox specified with AutoSizeMode as Horizontal

Samples:

C#: MultiSelectionComboBox_AutoSizeMode_C#

VB: MultiSelectionComboBox_AutoSizeMode_VB

Reference link: https://help.syncfusion.com/windowsforms/classic/multiselectioncombobox/automatic-control-sizing