how to disable all sundays in calendar using csharp in windows application

Hi,
It is difficult to disable the sunday, instead of we can restrict the user not to select the sunday.

DateTime lastDate;
        System.Text.RegularExpressions.Regex rg;
        bool valueChangingProgramatically = false;
        public Form1()
        {
            InitializeComponent();
            lastDate = dateTimePicker1.Value;
            rg = new System.Text.RegularExpressions.Regex("Sunday");
            if (lastDate < dateTimePicker1.Value)
                dateTimePicker1.Value = dateTimePicker1.Value.AddDays(1);

        }

        private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
        {
            if (!valueChangingProgramatically)
            {
                if (rg.IsMatch(dateTimePicker1.Value.ToLongDateString()))
                {
                    valueChangingProgramatically = true;
                    dateTimePicker1.Value = lastDate;
                    //here you can also show a messagebox if you want.
                }

            }
            else
                valueChangingProgramatically = false;
            lastDate = dateTimePicker1.Value;
        }

You can also use other custom control, please refer the below link
http://www.devexpress.com/Support/Center/p/Q148134.aspx


Best Regards
Muthuraja