Simple Combobox in Winforms - Firing twice (Use mouse to expand combobox and select a item using keyboard)

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Consider a very basic form with a simple combo box

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.comboBox1.Items.Add("test1");
        this.comboBox1.Items.Add("test2");
        this.comboBox1.Items.Add("test3");
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.comboBox1.SelectedIndexChanged += (o, args) => 
        {
            MessageBox.Show("Combo box changed!");
        };
    }
}

Expand the dropdown using mouse and select any item using keyboard.

It fires twice (The message box appears twice)

Any ideas why?

asked 1 min ago

now he who must not be named.

2,825

Simple Combobox in Winforms - Firing twice (Use mouse to expand combobox and select a item using keyboard)