Question

How do I show a list in a message box using a button click?

Answer 1

if you’re using winforms, you can double-click on your button, and do like so in the event handler

    private void button1_Click(object sender, EventArgs e)
    {
        List<string> strlst;
        StringBuilder sb = new StringBuilder();
        foreach(string s in strlst)
        {
            sb.AppendLine(s);
        }

        MessageBox.Show(sb.ToString());
    }