private void monthCalendar1_DateSelected(object sender, DateRangeEventArgs e)
        {
            textBox1.Text = e.Start.Date.ToString();
        }

------解决方案--------------------
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    C# code

    private void monthCalendar1_DateSelected(object sender, DateRangeEventArgs e)
        {
            textBox1.Text = e.Start.Date.ToString();
        }