How to select the item programmatically in winforms MultiSelectionComboBox?

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

Refer the below code for your reference.

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

C#: View sample in GitHub

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How to select the item programmatically in winforms MultiSelectionComboBox?

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