Programmatically Clear Selection in WPF ComboBox

Question

I have a ComboBox in WPF whose ItemsSource is set to a list programmatically. How would I go about clearing the selection in an event handler? I've tried:

comboBox.SelectedIndex = -1;
comboBox.SelectedItem = null;
comboBox.SelectedValue = null;
comboBox.SelectedValue = "";

None of them have any effect.

Answer 1

comboBox.SelectedIndex = -1; works for me.

Are you doing anything else in your event handler? Are you using databinding?

Answer 2

comboBox.SelectedIndex = -1;

Is the way to go. I don't know why it doesn't work for you; perhaps an event handler for SelectedIndexChanged changes the value?

Answer 3

I found that I needed to also add:

comboBox.Text = "";

to get the text to clear

Answer 4

I want to clear the ComboBox in DropDownClosed event of another ComboBox. Therefore I used following code inside of first ComboBox DropDownClosed event

private void comboBox1_DropDownClosed(object sender, EventArgs e)
{
  this.comboBox.ItemsSource = null;
}