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How to select the item programmatically in winforms MultiSelectionComboBox?
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You can select the item programmatically in MultiSelectionComboBox control by using the SelectedItem or the SelectedItems property.
Refer the below code for your reference.
C#
// 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.
C#
//Select the item in control multiSelectionComboBox1.SelectedIndex = 4;