How to select the item programmatically in winforms MultiSelectionComboBox?

You can select the item programmatically in MultiSelectionComboBox control by using the SelectedItem or the SelectedItems property.

Refer the below code for your reference.

// Using SelectedItem property to add item programmatically.
multiSelectionComboBox1.SelectedItem = multiSelectionComboBox1.Items[4];

You can also select the item in MultiSelectionComboBox control by using SelectedIndex property.

Refer the below code for your reference.

//Select the item in control
multiSelectionComboBox1.SelectedIndex = 4;

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