C# Choose dates in Calendar

I created a project with C#, in which i used 2 calendars . i would like to choose the working dates between the 2 dates.
Firstly i would like to reduce the number of calendars to one instead of 2.
I would like to choose the 2 dates in one calendar and i would like to appear the selected dates and the working days between 2 dates.

I need your advice for this  project.

my code is presented below:

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e)
        {


        }

        private void monthCalendar1_DateSelected(object sender, DateRangeEventArgs e)
        {
            this.textBox1.Text = ": Start = " + e.Start.ToShortDateString();

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void monthCalendar2_DateChanged(object sender, DateRangeEventArgs e)
        {
            this.textBox2.Text = ": END= " + e.Start.ToShortDateString();
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }
	}

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