You can do it by using given code.
if (dateTimePicker1.Text.Contains("Saturday"))
{
dateTimePicker1.Text = dateTimePicker1.Value.AddDays(2).ToString();
}
else if(dateTimePicker1.Text.Contains("Sunday"))
{
dateTimePicker1.Text = dateTimePicker1.Value.AddDays(1).ToString();
}
and there is no direct option to disable or hide specific date.
whatever, move Google for More Help.
:)